source: src/linux/universal/linux-4.9/drivers/gpu/drm/drm_atomic_helper.c @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 6 weeks ago

use new squashfs in all kernels

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1/*
2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
26 */
27
28#include <drm/drmP.h>
29#include <drm/drm_atomic.h>
30#include <drm/drm_plane_helper.h>
31#include <drm/drm_crtc_helper.h>
32#include <drm/drm_atomic_helper.h>
33#include <linux/fence.h>
34
35#include "drm_crtc_internal.h"
36
37/**
38 * DOC: overview
39 *
40 * This helper library provides implementations of check and commit functions on
41 * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
42 * also provides convenience implementations for the atomic state handling
43 * callbacks for drivers which don't need to subclass the drm core structures to
44 * add their own additional internal state.
45 *
46 * This library also provides default implementations for the check callback in
47 * drm_atomic_helper_check() and for the commit callback with
48 * drm_atomic_helper_commit(). But the individual stages and callbacks are
49 * exposed to allow drivers to mix and match and e.g. use the plane helpers only
50 * together with a driver private modeset implementation.
51 *
52 * This library also provides implementations for all the legacy driver
53 * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(),
54 * drm_atomic_helper_disable_plane(), drm_atomic_helper_disable_plane() and the
55 * various functions to implement set_property callbacks. New drivers must not
56 * implement these functions themselves but must use the provided helpers.
57 *
58 * The atomic helper uses the same function table structures as all other
59 * modesetting helpers. See the documentation for struct &drm_crtc_helper_funcs,
60 * struct &drm_encoder_helper_funcs and struct &drm_connector_helper_funcs. It
61 * also shares the struct &drm_plane_helper_funcs function table with the plane
62 * helpers.
63 */
64static void
65drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
66                                struct drm_plane_state *plane_state,
67                                struct drm_plane *plane)
68{
69        struct drm_crtc_state *crtc_state;
70
71        if (plane->state->crtc) {
72                crtc_state = drm_atomic_get_existing_crtc_state(state,
73                                                                plane->state->crtc);
74
75                if (WARN_ON(!crtc_state))
76                        return;
77
78                crtc_state->planes_changed = true;
79        }
80
81        if (plane_state->crtc) {
82                crtc_state = drm_atomic_get_existing_crtc_state(state,
83                                                                plane_state->crtc);
84
85                if (WARN_ON(!crtc_state))
86                        return;
87
88                crtc_state->planes_changed = true;
89        }
90}
91
92static int handle_conflicting_encoders(struct drm_atomic_state *state,
93                                       bool disable_conflicting_encoders)
94{
95        struct drm_connector_state *conn_state;
96        struct drm_connector *connector;
97        struct drm_encoder *encoder;
98        unsigned encoder_mask = 0;
99        int i, ret;
100
101        /*
102         * First loop, find all newly assigned encoders from the connectors
103         * part of the state. If the same encoder is assigned to multiple
104         * connectors bail out.
105         */
106        for_each_connector_in_state(state, connector, conn_state, i) {
107                const struct drm_connector_helper_funcs *funcs = connector->helper_private;
108                struct drm_encoder *new_encoder;
109
110                if (!conn_state->crtc)
111                        continue;
112
113                if (funcs->atomic_best_encoder)
114                        new_encoder = funcs->atomic_best_encoder(connector, conn_state);
115                else if (funcs->best_encoder)
116                        new_encoder = funcs->best_encoder(connector);
117                else
118                        new_encoder = drm_atomic_helper_best_encoder(connector);
119
120                if (new_encoder) {
121                        if (encoder_mask & (1 << drm_encoder_index(new_encoder))) {
122                                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n",
123                                        new_encoder->base.id, new_encoder->name,
124                                        connector->base.id, connector->name);
125
126                                return -EINVAL;
127                        }
128
129                        encoder_mask |= 1 << drm_encoder_index(new_encoder);
130                }
131        }
132
133        if (!encoder_mask)
134                return 0;
135
136        /*
137         * Second loop, iterate over all connectors not part of the state.
138         *
139         * If a conflicting encoder is found and disable_conflicting_encoders
140         * is not set, an error is returned. Userspace can provide a solution
141         * through the atomic ioctl.
142         *
143         * If the flag is set conflicting connectors are removed from the crtc
144         * and the crtc is disabled if no encoder is left. This preserves
145         * compatibility with the legacy set_config behavior.
146         */
147        drm_for_each_connector(connector, state->dev) {
148                struct drm_crtc_state *crtc_state;
149
150                if (drm_atomic_get_existing_connector_state(state, connector))
151                        continue;
152
153                encoder = connector->state->best_encoder;
154                if (!encoder || !(encoder_mask & (1 << drm_encoder_index(encoder))))
155                        continue;
156
157                if (!disable_conflicting_encoders) {
158                        DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n",
159                                         encoder->base.id, encoder->name,
160                                         connector->state->crtc->base.id,
161                                         connector->state->crtc->name,
162                                         connector->base.id, connector->name);
163                        return -EINVAL;
164                }
165
166                conn_state = drm_atomic_get_connector_state(state, connector);
167                if (IS_ERR(conn_state))
168                        return PTR_ERR(conn_state);
169
170                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n",
171                                 encoder->base.id, encoder->name,
172                                 conn_state->crtc->base.id, conn_state->crtc->name,
173                                 connector->base.id, connector->name);
174
175                crtc_state = drm_atomic_get_existing_crtc_state(state, conn_state->crtc);
176
177                ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
178                if (ret)
179                        return ret;
180
181                if (!crtc_state->connector_mask) {
182                        ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
183                                                                NULL);
184                        if (ret < 0)
185                                return ret;
186
187                        crtc_state->active = false;
188                }
189        }
190
191        return 0;
192}
193
194static void
195set_best_encoder(struct drm_atomic_state *state,
196                 struct drm_connector_state *conn_state,
197                 struct drm_encoder *encoder)
198{
199        struct drm_crtc_state *crtc_state;
200        struct drm_crtc *crtc;
201
202        if (conn_state->best_encoder) {
203                /* Unset the encoder_mask in the old crtc state. */
204                crtc = conn_state->connector->state->crtc;
205
206                /* A NULL crtc is an error here because we should have
207                 *  duplicated a NULL best_encoder when crtc was NULL.
208                 * As an exception restoring duplicated atomic state
209                 * during resume is allowed, so don't warn when
210                 * best_encoder is equal to encoder we intend to set.
211                 */
212                WARN_ON(!crtc && encoder != conn_state->best_encoder);
213                if (crtc) {
214                        crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
215
216                        crtc_state->encoder_mask &=
217                                ~(1 << drm_encoder_index(conn_state->best_encoder));
218                }
219        }
220
221        if (encoder) {
222                crtc = conn_state->crtc;
223                WARN_ON(!crtc);
224                if (crtc) {
225                        crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
226
227                        crtc_state->encoder_mask |=
228                                1 << drm_encoder_index(encoder);
229                }
230        }
231
232        conn_state->best_encoder = encoder;
233}
234
235static void
236steal_encoder(struct drm_atomic_state *state,
237              struct drm_encoder *encoder)
238{
239        struct drm_crtc_state *crtc_state;
240        struct drm_connector *connector;
241        struct drm_connector_state *connector_state;
242        int i;
243
244        for_each_connector_in_state(state, connector, connector_state, i) {
245                struct drm_crtc *encoder_crtc;
246
247                if (connector_state->best_encoder != encoder)
248                        continue;
249
250                encoder_crtc = connector->state->crtc;
251
252                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n",
253                                 encoder->base.id, encoder->name,
254                                 encoder_crtc->base.id, encoder_crtc->name);
255
256                set_best_encoder(state, connector_state, NULL);
257
258                crtc_state = drm_atomic_get_existing_crtc_state(state, encoder_crtc);
259                crtc_state->connectors_changed = true;
260
261                return;
262        }
263}
264
265static int
266update_connector_routing(struct drm_atomic_state *state,
267                         struct drm_connector *connector,
268                         struct drm_connector_state *connector_state)
269{
270        const struct drm_connector_helper_funcs *funcs;
271        struct drm_encoder *new_encoder;
272        struct drm_crtc_state *crtc_state;
273
274        DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n",
275                         connector->base.id,
276                         connector->name);
277
278        if (connector->state->crtc != connector_state->crtc) {
279                if (connector->state->crtc) {
280                        crtc_state = drm_atomic_get_existing_crtc_state(state, connector->state->crtc);
281                        crtc_state->connectors_changed = true;
282                }
283
284                if (connector_state->crtc) {
285                        crtc_state = drm_atomic_get_existing_crtc_state(state, connector_state->crtc);
286                        crtc_state->connectors_changed = true;
287                }
288        }
289
290        if (!connector_state->crtc) {
291                DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n",
292                                connector->base.id,
293                                connector->name);
294
295                set_best_encoder(state, connector_state, NULL);
296
297                return 0;
298        }
299
300        funcs = connector->helper_private;
301
302        if (funcs->atomic_best_encoder)
303                new_encoder = funcs->atomic_best_encoder(connector,
304                                                         connector_state);
305        else if (funcs->best_encoder)
306                new_encoder = funcs->best_encoder(connector);
307        else
308                new_encoder = drm_atomic_helper_best_encoder(connector);
309
310        if (!new_encoder) {
311                DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
312                                 connector->base.id,
313                                 connector->name);
314                return -EINVAL;
315        }
316
317        if (!drm_encoder_crtc_ok(new_encoder, connector_state->crtc)) {
318                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d]\n",
319                                 new_encoder->base.id,
320                                 new_encoder->name,
321                                 connector_state->crtc->base.id);
322                return -EINVAL;
323        }
324
325        if (new_encoder == connector_state->best_encoder) {
326                set_best_encoder(state, connector_state, new_encoder);
327
328                DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n",
329                                 connector->base.id,
330                                 connector->name,
331                                 new_encoder->base.id,
332                                 new_encoder->name,
333                                 connector_state->crtc->base.id,
334                                 connector_state->crtc->name);
335
336                return 0;
337        }
338
339        steal_encoder(state, new_encoder);
340
341        set_best_encoder(state, connector_state, new_encoder);
342
343        crtc_state = drm_atomic_get_existing_crtc_state(state, connector_state->crtc);
344        crtc_state->connectors_changed = true;
345
346        DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n",
347                         connector->base.id,
348                         connector->name,
349                         new_encoder->base.id,
350                         new_encoder->name,
351                         connector_state->crtc->base.id,
352                         connector_state->crtc->name);
353
354        return 0;
355}
356
357static int
358mode_fixup(struct drm_atomic_state *state)
359{
360        struct drm_crtc *crtc;
361        struct drm_crtc_state *crtc_state;
362        struct drm_connector *connector;
363        struct drm_connector_state *conn_state;
364        int i;
365        int ret;
366
367        for_each_crtc_in_state(state, crtc, crtc_state, i) {
368                if (!crtc_state->mode_changed &&
369                    !crtc_state->connectors_changed)
370                        continue;
371
372                drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
373        }
374
375        for_each_connector_in_state(state, connector, conn_state, i) {
376                const struct drm_encoder_helper_funcs *funcs;
377                struct drm_encoder *encoder;
378
379                WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
380
381                if (!conn_state->crtc || !conn_state->best_encoder)
382                        continue;
383
384                crtc_state = drm_atomic_get_existing_crtc_state(state,
385                                                                conn_state->crtc);
386
387                /*
388                 * Each encoder has at most one connector (since we always steal
389                 * it away), so we won't call ->mode_fixup twice.
390                 */
391                encoder = conn_state->best_encoder;
392                funcs = encoder->helper_private;
393
394                ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode,
395                                &crtc_state->adjusted_mode);
396                if (!ret) {
397                        DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
398                        return -EINVAL;
399                }
400
401                if (funcs && funcs->atomic_check) {
402                        ret = funcs->atomic_check(encoder, crtc_state,
403                                                  conn_state);
404                        if (ret) {
405                                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
406                                                 encoder->base.id, encoder->name);
407                                return ret;
408                        }
409                } else if (funcs && funcs->mode_fixup) {
410                        ret = funcs->mode_fixup(encoder, &crtc_state->mode,
411                                                &crtc_state->adjusted_mode);
412                        if (!ret) {
413                                DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
414                                                 encoder->base.id, encoder->name);
415                                return -EINVAL;
416                        }
417                }
418        }
419
420        for_each_crtc_in_state(state, crtc, crtc_state, i) {
421                const struct drm_crtc_helper_funcs *funcs;
422
423                if (!crtc_state->enable)
424                        continue;
425
426                if (!crtc_state->mode_changed &&
427                    !crtc_state->connectors_changed)
428                        continue;
429
430                funcs = crtc->helper_private;
431                if (!funcs->mode_fixup)
432                        continue;
433
434                ret = funcs->mode_fixup(crtc, &crtc_state->mode,
435                                        &crtc_state->adjusted_mode);
436                if (!ret) {
437                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] fixup failed\n",
438                                         crtc->base.id, crtc->name);
439                        return -EINVAL;
440                }
441        }
442
443        return 0;
444}
445
446/**
447 * drm_atomic_helper_check_modeset - validate state object for modeset changes
448 * @dev: DRM device
449 * @state: the driver state object
450 *
451 * Check the state object to see if the requested state is physically possible.
452 * This does all the crtc and connector related computations for an atomic
453 * update and adds any additional connectors needed for full modesets and calls
454 * down into ->mode_fixup functions of the driver backend.
455 *
456 * crtc_state->mode_changed is set when the input mode is changed.
457 * crtc_state->connectors_changed is set when a connector is added or
458 * removed from the crtc.
459 * crtc_state->active_changed is set when crtc_state->active changes,
460 * which is used for dpms.
461 *
462 * IMPORTANT:
463 *
464 * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
465 * plane update can't be done without a full modeset) _must_ call this function
466 * afterwards after that change. It is permitted to call this function multiple
467 * times for the same update, e.g. when the ->atomic_check functions depend upon
468 * the adjusted dotclock for fifo space allocation and watermark computation.
469 *
470 * RETURNS:
471 * Zero for success or -errno
472 */
473int
474drm_atomic_helper_check_modeset(struct drm_device *dev,
475                                struct drm_atomic_state *state)
476{
477        struct drm_crtc *crtc;
478        struct drm_crtc_state *crtc_state;
479        struct drm_connector *connector;
480        struct drm_connector_state *connector_state;
481        int i, ret;
482
483        for_each_crtc_in_state(state, crtc, crtc_state, i) {
484                if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
485                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode changed\n",
486                                         crtc->base.id, crtc->name);
487                        crtc_state->mode_changed = true;
488                }
489
490                if (crtc->state->enable != crtc_state->enable) {
491                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enable changed\n",
492                                         crtc->base.id, crtc->name);
493
494                        /*
495                         * For clarity this assignment is done here, but
496                         * enable == 0 is only true when there are no
497                         * connectors and a NULL mode.
498                         *
499                         * The other way around is true as well. enable != 0
500                         * iff connectors are attached and a mode is set.
501                         */
502                        crtc_state->mode_changed = true;
503                        crtc_state->connectors_changed = true;
504                }
505        }
506
507        ret = handle_conflicting_encoders(state, state->legacy_set_config);
508        if (ret)
509                return ret;
510
511        for_each_connector_in_state(state, connector, connector_state, i) {
512                /*
513                 * This only sets crtc->mode_changed for routing changes,
514                 * drivers must set crtc->mode_changed themselves when connector
515                 * properties need to be updated.
516                 */
517                ret = update_connector_routing(state, connector,
518                                               connector_state);
519                if (ret)
520                        return ret;
521        }
522
523        /*
524         * After all the routing has been prepared we need to add in any
525         * connector which is itself unchanged, but who's crtc changes it's
526         * configuration. This must be done before calling mode_fixup in case a
527         * crtc only changed its mode but has the same set of connectors.
528         */
529        for_each_crtc_in_state(state, crtc, crtc_state, i) {
530                bool has_connectors =
531                        !!crtc_state->connector_mask;
532
533                /*
534                 * We must set ->active_changed after walking connectors for
535                 * otherwise an update that only changes active would result in
536                 * a full modeset because update_connector_routing force that.
537                 */
538                if (crtc->state->active != crtc_state->active) {
539                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active changed\n",
540                                         crtc->base.id, crtc->name);
541                        crtc_state->active_changed = true;
542                }
543
544                if (!drm_atomic_crtc_needs_modeset(crtc_state))
545                        continue;
546
547                DRM_DEBUG_ATOMIC("[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n",
548                                 crtc->base.id, crtc->name,
549                                 crtc_state->enable ? 'y' : 'n',
550                                 crtc_state->active ? 'y' : 'n');
551
552                ret = drm_atomic_add_affected_connectors(state, crtc);
553                if (ret != 0)
554                        return ret;
555
556                ret = drm_atomic_add_affected_planes(state, crtc);
557                if (ret != 0)
558                        return ret;
559
560                if (crtc_state->enable != has_connectors) {
561                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled/connectors mismatch\n",
562                                         crtc->base.id, crtc->name);
563
564                        return -EINVAL;
565                }
566        }
567
568        return mode_fixup(state);
569}
570EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
571
572/**
573 * drm_atomic_helper_check_planes - validate state object for planes changes
574 * @dev: DRM device
575 * @state: the driver state object
576 *
577 * Check the state object to see if the requested state is physically possible.
578 * This does all the plane update related checks using by calling into the
579 * ->atomic_check hooks provided by the driver.
580 *
581 * It also sets crtc_state->planes_changed to indicate that a crtc has
582 * updated planes.
583 *
584 * RETURNS:
585 * Zero for success or -errno
586 */
587int
588drm_atomic_helper_check_planes(struct drm_device *dev,
589                               struct drm_atomic_state *state)
590{
591        struct drm_crtc *crtc;
592        struct drm_crtc_state *crtc_state;
593        struct drm_plane *plane;
594        struct drm_plane_state *plane_state;
595        int i, ret = 0;
596
597        for_each_plane_in_state(state, plane, plane_state, i) {
598                const struct drm_plane_helper_funcs *funcs;
599
600                funcs = plane->helper_private;
601
602                drm_atomic_helper_plane_changed(state, plane_state, plane);
603
604                if (!funcs || !funcs->atomic_check)
605                        continue;
606
607                ret = funcs->atomic_check(plane, plane_state);
608                if (ret) {
609                        DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic driver check failed\n",
610                                         plane->base.id, plane->name);
611                        return ret;
612                }
613        }
614
615        for_each_crtc_in_state(state, crtc, crtc_state, i) {
616                const struct drm_crtc_helper_funcs *funcs;
617
618                funcs = crtc->helper_private;
619
620                if (!funcs || !funcs->atomic_check)
621                        continue;
622
623                ret = funcs->atomic_check(crtc, crtc_state);
624                if (ret) {
625                        DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic driver check failed\n",
626                                         crtc->base.id, crtc->name);
627                        return ret;
628                }
629        }
630
631        return ret;
632}
633EXPORT_SYMBOL(drm_atomic_helper_check_planes);
634
635/**
636 * drm_atomic_helper_check - validate state object
637 * @dev: DRM device
638 * @state: the driver state object
639 *
640 * Check the state object to see if the requested state is physically possible.
641 * Only crtcs and planes have check callbacks, so for any additional (global)
642 * checking that a driver needs it can simply wrap that around this function.
643 * Drivers without such needs can directly use this as their ->atomic_check()
644 * callback.
645 *
646 * This just wraps the two parts of the state checking for planes and modeset
647 * state in the default order: First it calls drm_atomic_helper_check_modeset()
648 * and then drm_atomic_helper_check_planes(). The assumption is that the
649 * ->atomic_check functions depend upon an updated adjusted_mode.clock to
650 * e.g. properly compute watermarks.
651 *
652 * RETURNS:
653 * Zero for success or -errno
654 */
655int drm_atomic_helper_check(struct drm_device *dev,
656                            struct drm_atomic_state *state)
657{
658        int ret;
659
660        ret = drm_atomic_helper_check_modeset(dev, state);
661        if (ret)
662                return ret;
663
664        ret = drm_atomic_helper_check_planes(dev, state);
665        if (ret)
666                return ret;
667
668        return ret;
669}
670EXPORT_SYMBOL(drm_atomic_helper_check);
671
672static void
673disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
674{
675        struct drm_connector *connector;
676        struct drm_connector_state *old_conn_state;
677        struct drm_crtc *crtc;
678        struct drm_crtc_state *old_crtc_state;
679        int i;
680
681        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
682                const struct drm_encoder_helper_funcs *funcs;
683                struct drm_encoder *encoder;
684
685                /* Shut down everything that's in the changeset and currently
686                 * still on. So need to check the old, saved state. */
687                if (!old_conn_state->crtc)
688                        continue;
689
690                old_crtc_state = drm_atomic_get_existing_crtc_state(old_state,
691                                                                    old_conn_state->crtc);
692
693                if (!old_crtc_state->active ||
694                    !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
695                        continue;
696
697                encoder = old_conn_state->best_encoder;
698
699                /* We shouldn't get this far if we didn't previously have
700                 * an encoder.. but WARN_ON() rather than explode.
701                 */
702                if (WARN_ON(!encoder))
703                        continue;
704
705                funcs = encoder->helper_private;
706
707                DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
708                                 encoder->base.id, encoder->name);
709
710                /*
711                 * Each encoder has at most one connector (since we always steal
712                 * it away), so we won't call disable hooks twice.
713                 */
714                drm_bridge_disable(encoder->bridge);
715
716                /* Right function depends upon target state. */
717                if (funcs) {
718                        if (connector->state->crtc && funcs->prepare)
719                                funcs->prepare(encoder);
720                        else if (funcs->disable)
721                                funcs->disable(encoder);
722                        else if (funcs->dpms)
723                                funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
724                }
725
726                drm_bridge_post_disable(encoder->bridge);
727        }
728
729        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
730                const struct drm_crtc_helper_funcs *funcs;
731
732                /* Shut down everything that needs a full modeset. */
733                if (!drm_atomic_crtc_needs_modeset(crtc->state))
734                        continue;
735
736                if (!old_crtc_state->active)
737                        continue;
738
739                funcs = crtc->helper_private;
740
741                DRM_DEBUG_ATOMIC("disabling [CRTC:%d:%s]\n",
742                                 crtc->base.id, crtc->name);
743
744
745                /* Right function depends upon target state. */
746                if (crtc->state->enable && funcs->prepare)
747                        funcs->prepare(crtc);
748                else if (funcs->atomic_disable)
749                        funcs->atomic_disable(crtc, old_crtc_state);
750                else if (funcs->disable)
751                        funcs->disable(crtc);
752                else
753                        funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
754        }
755}
756
757/**
758 * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
759 * @dev: DRM device
760 * @old_state: atomic state object with old state structures
761 *
762 * This function updates all the various legacy modeset state pointers in
763 * connectors, encoders and crtcs. It also updates the timestamping constants
764 * used for precise vblank timestamps by calling
765 * drm_calc_timestamping_constants().
766 *
767 * Drivers can use this for building their own atomic commit if they don't have
768 * a pure helper-based modeset implementation.
769 */
770void
771drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
772                                              struct drm_atomic_state *old_state)
773{
774        struct drm_connector *connector;
775        struct drm_connector_state *old_conn_state;
776        struct drm_crtc *crtc;
777        struct drm_crtc_state *old_crtc_state;
778        int i;
779
780        /* clear out existing links and update dpms */
781        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
782                if (connector->encoder) {
783                        WARN_ON(!connector->encoder->crtc);
784
785                        connector->encoder->crtc = NULL;
786                        connector->encoder = NULL;
787                }
788
789                crtc = connector->state->crtc;
790                if ((!crtc && old_conn_state->crtc) ||
791                    (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) {
792                        struct drm_property *dpms_prop =
793                                dev->mode_config.dpms_property;
794                        int mode = DRM_MODE_DPMS_OFF;
795
796                        if (crtc && crtc->state->active)
797                                mode = DRM_MODE_DPMS_ON;
798
799                        connector->dpms = mode;
800                        drm_object_property_set_value(&connector->base,
801                                                      dpms_prop, mode);
802                }
803        }
804
805        /* set new links */
806        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
807                if (!connector->state->crtc)
808                        continue;
809
810                if (WARN_ON(!connector->state->best_encoder))
811                        continue;
812
813                connector->encoder = connector->state->best_encoder;
814                connector->encoder->crtc = connector->state->crtc;
815        }
816
817        /* set legacy state in the crtc structure */
818        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
819                struct drm_plane *primary = crtc->primary;
820
821                crtc->mode = crtc->state->mode;
822                crtc->enabled = crtc->state->enable;
823
824                if (drm_atomic_get_existing_plane_state(old_state, primary) &&
825                    primary->state->crtc == crtc) {
826                        crtc->x = primary->state->src_x >> 16;
827                        crtc->y = primary->state->src_y >> 16;
828                }
829
830                if (crtc->state->enable)
831                        drm_calc_timestamping_constants(crtc,
832                                                        &crtc->state->adjusted_mode);
833        }
834}
835EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
836
837static void
838crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
839{
840        struct drm_crtc *crtc;
841        struct drm_crtc_state *old_crtc_state;
842        struct drm_connector *connector;
843        struct drm_connector_state *old_conn_state;
844        int i;
845
846        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
847                const struct drm_crtc_helper_funcs *funcs;
848
849                if (!crtc->state->mode_changed)
850                        continue;
851
852                funcs = crtc->helper_private;
853
854                if (crtc->state->enable && funcs->mode_set_nofb) {
855                        DRM_DEBUG_ATOMIC("modeset on [CRTC:%d:%s]\n",
856                                         crtc->base.id, crtc->name);
857
858                        funcs->mode_set_nofb(crtc);
859                }
860        }
861
862        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
863                const struct drm_encoder_helper_funcs *funcs;
864                struct drm_crtc_state *new_crtc_state;
865                struct drm_encoder *encoder;
866                struct drm_display_mode *mode, *adjusted_mode;
867
868                if (!connector->state->best_encoder)
869                        continue;
870
871                encoder = connector->state->best_encoder;
872                funcs = encoder->helper_private;
873                new_crtc_state = connector->state->crtc->state;
874                mode = &new_crtc_state->mode;
875                adjusted_mode = &new_crtc_state->adjusted_mode;
876
877                if (!new_crtc_state->mode_changed)
878                        continue;
879
880                DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
881                                 encoder->base.id, encoder->name);
882
883                /*
884                 * Each encoder has at most one connector (since we always steal
885                 * it away), so we won't call mode_set hooks twice.
886                 */
887                if (funcs && funcs->atomic_mode_set) {
888                        funcs->atomic_mode_set(encoder, new_crtc_state,
889                                               connector->state);
890                } else if (funcs && funcs->mode_set) {
891                        funcs->mode_set(encoder, mode, adjusted_mode);
892                }
893
894                drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
895        }
896}
897
898/**
899 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
900 * @dev: DRM device
901 * @old_state: atomic state object with old state structures
902 *
903 * This function shuts down all the outputs that need to be shut down and
904 * prepares them (if required) with the new mode.
905 *
906 * For compatibility with legacy crtc helpers this should be called before
907 * drm_atomic_helper_commit_planes(), which is what the default commit function
908 * does. But drivers with different needs can group the modeset commits together
909 * and do the plane commits at the end. This is useful for drivers doing runtime
910 * PM since planes updates then only happen when the CRTC is actually enabled.
911 */
912void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
913                                               struct drm_atomic_state *old_state)
914{
915        disable_outputs(dev, old_state);
916
917        drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
918
919        crtc_set_mode(dev, old_state);
920}
921EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
922
923/**
924 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
925 * @dev: DRM device
926 * @old_state: atomic state object with old state structures
927 *
928 * This function enables all the outputs with the new configuration which had to
929 * be turned off for the update.
930 *
931 * For compatibility with legacy crtc helpers this should be called after
932 * drm_atomic_helper_commit_planes(), which is what the default commit function
933 * does. But drivers with different needs can group the modeset commits together
934 * and do the plane commits at the end. This is useful for drivers doing runtime
935 * PM since planes updates then only happen when the CRTC is actually enabled.
936 */
937void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
938                                              struct drm_atomic_state *old_state)
939{
940        struct drm_crtc *crtc;
941        struct drm_crtc_state *old_crtc_state;
942        struct drm_connector *connector;
943        struct drm_connector_state *old_conn_state;
944        int i;
945
946        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
947                const struct drm_crtc_helper_funcs *funcs;
948
949                /* Need to filter out CRTCs where only planes change. */
950                if (!drm_atomic_crtc_needs_modeset(crtc->state))
951                        continue;
952
953                if (!crtc->state->active)
954                        continue;
955
956                funcs = crtc->helper_private;
957
958                if (crtc->state->enable) {
959                        DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n",
960                                         crtc->base.id, crtc->name);
961
962                        if (funcs->enable)
963                                funcs->enable(crtc);
964                        else
965                                funcs->commit(crtc);
966                }
967        }
968
969        for_each_connector_in_state(old_state, connector, old_conn_state, i) {
970                const struct drm_encoder_helper_funcs *funcs;
971                struct drm_encoder *encoder;
972
973                if (!connector->state->best_encoder)
974                        continue;
975
976                if (!connector->state->crtc->state->active ||
977                    !drm_atomic_crtc_needs_modeset(connector->state->crtc->state))
978                        continue;
979
980                encoder = connector->state->best_encoder;
981                funcs = encoder->helper_private;
982
983                DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
984                                 encoder->base.id, encoder->name);
985
986                /*
987                 * Each encoder has at most one connector (since we always steal
988                 * it away), so we won't call enable hooks twice.
989                 */
990                drm_bridge_pre_enable(encoder->bridge);
991
992                if (funcs) {
993                        if (funcs->enable)
994                                funcs->enable(encoder);
995                        else if (funcs->commit)
996                                funcs->commit(encoder);
997                }
998
999                drm_bridge_enable(encoder->bridge);
1000        }
1001}
1002EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
1003
1004/**
1005 * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
1006 * @dev: DRM device
1007 * @state: atomic state object with old state structures
1008 * @pre_swap: if true, do an interruptible wait
1009 *
1010 * For implicit sync, driver should fish the exclusive fence out from the
1011 * incoming fb's and stash it in the drm_plane_state.  This is called after
1012 * drm_atomic_helper_swap_state() so it uses the current plane state (and
1013 * just uses the atomic state to find the changed planes)
1014 *
1015 * Returns zero if success or < 0 if fence_wait() fails.
1016 */
1017int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
1018                                      struct drm_atomic_state *state,
1019                                      bool pre_swap)
1020{
1021        struct drm_plane *plane;
1022        struct drm_plane_state *plane_state;
1023        int i, ret;
1024
1025        for_each_plane_in_state(state, plane, plane_state, i) {
1026                if (!pre_swap)
1027                        plane_state = plane->state;
1028
1029                if (!plane_state->fence)
1030                        continue;
1031
1032                WARN_ON(!plane_state->fb);
1033
1034                /*
1035                 * If waiting for fences pre-swap (ie: nonblock), userspace can
1036                 * still interrupt the operation. Instead of blocking until the
1037                 * timer expires, make the wait interruptible.
1038                 */
1039                ret = fence_wait(plane_state->fence, pre_swap);
1040                if (ret)
1041                        return ret;
1042
1043                fence_put(plane_state->fence);
1044                plane_state->fence = NULL;
1045        }
1046
1047        return 0;
1048}
1049EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
1050
1051/**
1052 * drm_atomic_helper_framebuffer_changed - check if framebuffer has changed
1053 * @dev: DRM device
1054 * @old_state: atomic state object with old state structures
1055 * @crtc: DRM crtc
1056 *
1057 * Checks whether the framebuffer used for this CRTC changes as a result of
1058 * the atomic update.  This is useful for drivers which cannot use
1059 * drm_atomic_helper_wait_for_vblanks() and need to reimplement its
1060 * functionality.
1061 *
1062 * Returns:
1063 * true if the framebuffer changed.
1064 */
1065bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev,
1066                                           struct drm_atomic_state *old_state,
1067                                           struct drm_crtc *crtc)
1068{
1069        struct drm_plane *plane;
1070        struct drm_plane_state *old_plane_state;
1071        int i;
1072
1073        for_each_plane_in_state(old_state, plane, old_plane_state, i) {
1074                if (plane->state->crtc != crtc &&
1075                    old_plane_state->crtc != crtc)
1076                        continue;
1077
1078                if (plane->state->fb != old_plane_state->fb)
1079                        return true;
1080        }
1081
1082        return false;
1083}
1084EXPORT_SYMBOL(drm_atomic_helper_framebuffer_changed);
1085
1086/**
1087 * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
1088 * @dev: DRM device
1089 * @old_state: atomic state object with old state structures
1090 *
1091 * Helper to, after atomic commit, wait for vblanks on all effected
1092 * crtcs (ie. before cleaning up old framebuffers using
1093 * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
1094 * framebuffers have actually changed to optimize for the legacy cursor and
1095 * plane update use-case.
1096 */
1097void
1098drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
1099                struct drm_atomic_state *old_state)
1100{
1101        struct drm_crtc *crtc;
1102        struct drm_crtc_state *old_crtc_state;
1103        int i, ret;
1104
1105        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1106                /* No one cares about the old state, so abuse it for tracking
1107                 * and store whether we hold a vblank reference (and should do a
1108                 * vblank wait) in the ->enable boolean. */
1109                old_crtc_state->enable = false;
1110
1111                if (!crtc->state->enable)
1112                        continue;
1113
1114                /* Legacy cursor ioctls are completely unsynced, and userspace
1115                 * relies on that (by doing tons of cursor updates). */
1116                if (old_state->legacy_cursor_update)
1117                        continue;
1118
1119                if (!drm_atomic_helper_framebuffer_changed(dev,
1120                                old_state, crtc))
1121                        continue;
1122
1123                ret = drm_crtc_vblank_get(crtc);
1124                if (ret != 0)
1125                        continue;
1126
1127                old_crtc_state->enable = true;
1128                old_crtc_state->last_vblank_count = drm_crtc_vblank_count(crtc);
1129        }
1130
1131        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1132                if (!old_crtc_state->enable)
1133                        continue;
1134
1135                ret = wait_event_timeout(dev->vblank[i].queue,
1136                                old_crtc_state->last_vblank_count !=
1137                                        drm_crtc_vblank_count(crtc),
1138                                msecs_to_jiffies(50));
1139
1140                WARN(!ret, "[CRTC:%d] vblank wait timed out\n", crtc->base.id);
1141
1142                drm_crtc_vblank_put(crtc);
1143        }
1144}
1145EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
1146
1147/**
1148 * drm_atomic_helper_commit_tail - commit atomic update to hardware
1149 * @state: new modeset state to be committed
1150 *
1151 * This is the default implemenation for the ->atomic_commit_tail() hook of the
1152 * &drm_mode_config_helper_funcs vtable.
1153 *
1154 * Note that the default ordering of how the various stages are called is to
1155 * match the legacy modeset helper library closest. One peculiarity of that is
1156 * that it doesn't mesh well with runtime PM at all.
1157 *
1158 * For drivers supporting runtime PM the recommended sequence is instead ::
1159 *
1160 *     drm_atomic_helper_commit_modeset_disables(dev, state);
1161 *
1162 *     drm_atomic_helper_commit_modeset_enables(dev, state);
1163 *
1164 *     drm_atomic_helper_commit_planes(dev, state,
1165 *                                     DRM_PLANE_COMMIT_ACTIVE_ONLY);
1166 *
1167 * for committing the atomic update to hardware.  See the kerneldoc entries for
1168 * these three functions for more details.
1169 */
1170void drm_atomic_helper_commit_tail(struct drm_atomic_state *state)
1171{
1172        struct drm_device *dev = state->dev;
1173
1174        drm_atomic_helper_commit_modeset_disables(dev, state);
1175
1176        drm_atomic_helper_commit_planes(dev, state, 0);
1177
1178        drm_atomic_helper_commit_modeset_enables(dev, state);
1179
1180        drm_atomic_helper_commit_hw_done(state);
1181
1182        drm_atomic_helper_wait_for_vblanks(dev, state);
1183
1184        drm_atomic_helper_cleanup_planes(dev, state);
1185}
1186EXPORT_SYMBOL(drm_atomic_helper_commit_tail);
1187
1188static void commit_tail(struct drm_atomic_state *state)
1189{
1190        struct drm_device *dev = state->dev;
1191        struct drm_mode_config_helper_funcs *funcs;
1192
1193        funcs = dev->mode_config.helper_private;
1194
1195        drm_atomic_helper_wait_for_fences(dev, state, false);
1196
1197        drm_atomic_helper_wait_for_dependencies(state);
1198
1199        if (funcs && funcs->atomic_commit_tail)
1200                funcs->atomic_commit_tail(state);
1201        else
1202                drm_atomic_helper_commit_tail(state);
1203
1204        drm_atomic_helper_commit_cleanup_done(state);
1205
1206        drm_atomic_state_free(state);
1207}
1208
1209static void commit_work(struct work_struct *work)
1210{
1211        struct drm_atomic_state *state = container_of(work,
1212                                                      struct drm_atomic_state,
1213                                                      commit_work);
1214        commit_tail(state);
1215}
1216
1217/**
1218 * drm_atomic_helper_commit - commit validated state object
1219 * @dev: DRM device
1220 * @state: the driver state object
1221 * @nonblock: whether nonblocking behavior is requested.
1222 *
1223 * This function commits a with drm_atomic_helper_check() pre-validated state
1224 * object. This can still fail when e.g. the framebuffer reservation fails. This
1225 * function implements nonblocking commits, using
1226 * drm_atomic_helper_setup_commit() and related functions.
1227 *
1228 * Note that right now this function does not support nonblocking commits, hence
1229 * driver writers must implement their own version for now.
1230 *
1231 * Committing the actual hardware state is done through the
1232 * ->atomic_commit_tail() callback of the &drm_mode_config_helper_funcs vtable,
1233 * or it's default implementation drm_atomic_helper_commit_tail().
1234 *
1235 * RETURNS:
1236 * Zero for success or -errno.
1237 */
1238int drm_atomic_helper_commit(struct drm_device *dev,
1239                             struct drm_atomic_state *state,
1240                             bool nonblock)
1241{
1242        int ret;
1243
1244        ret = drm_atomic_helper_setup_commit(state, nonblock);
1245        if (ret)
1246                return ret;
1247
1248        INIT_WORK(&state->commit_work, commit_work);
1249
1250        ret = drm_atomic_helper_prepare_planes(dev, state);
1251        if (ret)
1252                return ret;
1253
1254        if (!nonblock) {
1255                ret = drm_atomic_helper_wait_for_fences(dev, state, true);
1256                if (ret) {
1257                        drm_atomic_helper_cleanup_planes(dev, state);
1258                        return ret;
1259                }
1260        }
1261
1262        /*
1263         * This is the point of no return - everything below never fails except
1264         * when the hw goes bonghits. Which means we can commit the new state on
1265         * the software side now.
1266         */
1267
1268        drm_atomic_helper_swap_state(state, true);
1269
1270        /*
1271         * Everything below can be run asynchronously without the need to grab
1272         * any modeset locks at all under one condition: It must be guaranteed
1273         * that the asynchronous work has either been cancelled (if the driver
1274         * supports it, which at least requires that the framebuffers get
1275         * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
1276         * before the new state gets committed on the software side with
1277         * drm_atomic_helper_swap_state().
1278         *
1279         * This scheme allows new atomic state updates to be prepared and
1280         * checked in parallel to the asynchronous completion of the previous
1281         * update. Which is important since compositors need to figure out the
1282         * composition of the next frame right after having submitted the
1283         * current layout.
1284         *
1285         * NOTE: Commit work has multiple phases, first hardware commit, then
1286         * cleanup. We want them to overlap, hence need system_unbound_wq to
1287         * make sure work items don't artifically stall on each another.
1288         */
1289
1290        if (nonblock)
1291                queue_work(system_unbound_wq, &state->commit_work);
1292        else
1293                commit_tail(state);
1294
1295        return 0;
1296}
1297EXPORT_SYMBOL(drm_atomic_helper_commit);
1298
1299/**
1300 * DOC: implementing nonblocking commit
1301 *
1302 * Nonblocking atomic commits have to be implemented in the following sequence:
1303 *
1304 * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
1305 * which commit needs to call which can fail, so we want to run it first and
1306 * synchronously.
1307 *
1308 * 2. Synchronize with any outstanding nonblocking commit worker threads which
1309 * might be affected the new state update. This can be done by either cancelling
1310 * or flushing the work items, depending upon whether the driver can deal with
1311 * cancelled updates. Note that it is important to ensure that the framebuffer
1312 * cleanup is still done when cancelling.
1313 *
1314 * Asynchronous workers need to have sufficient parallelism to be able to run
1315 * different atomic commits on different CRTCs in parallel. The simplest way to
1316 * achive this is by running them on the &system_unbound_wq work queue. Note
1317 * that drivers are not required to split up atomic commits and run an
1318 * individual commit in parallel - userspace is supposed to do that if it cares.
1319 * But it might be beneficial to do that for modesets, since those necessarily
1320 * must be done as one global operation, and enabling or disabling a CRTC can
1321 * take a long time. But even that is not required.
1322 *
1323 * 3. The software state is updated synchronously with
1324 * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset
1325 * locks means concurrent callers never see inconsistent state. And doing this
1326 * while it's guaranteed that no relevant nonblocking worker runs means that
1327 * nonblocking workers do not need grab any locks. Actually they must not grab
1328 * locks, for otherwise the work flushing will deadlock.
1329 *
1330 * 4. Schedule a work item to do all subsequent steps, using the split-out
1331 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1332 * then cleaning up the framebuffers after the old framebuffer is no longer
1333 * being displayed.
1334 *
1335 * The above scheme is implemented in the atomic helper libraries in
1336 * drm_atomic_helper_commit() using a bunch of helper functions. See
1337 * drm_atomic_helper_setup_commit() for a starting point.
1338 */
1339
1340static int stall_checks(struct drm_crtc *crtc, bool nonblock)
1341{
1342        struct drm_crtc_commit *commit, *stall_commit = NULL;
1343        bool completed = true;
1344        int i;
1345        long ret = 0;
1346
1347        spin_lock(&crtc->commit_lock);
1348        i = 0;
1349        list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
1350                if (i == 0) {
1351                        completed = try_wait_for_completion(&commit->flip_done);
1352                        /* Userspace is not allowed to get ahead of the previous
1353                         * commit with nonblocking ones. */
1354                        if (!completed && nonblock) {
1355                                spin_unlock(&crtc->commit_lock);
1356                                return -EBUSY;
1357                        }
1358                } else if (i == 1) {
1359                        stall_commit = commit;
1360                        drm_crtc_commit_get(stall_commit);
1361                        break;
1362                }
1363
1364                i++;
1365        }
1366        spin_unlock(&crtc->commit_lock);
1367
1368        if (!stall_commit)
1369                return 0;
1370
1371        /* We don't want to let commits get ahead of cleanup work too much,
1372         * stalling on 2nd previous commit means triple-buffer won't ever stall.
1373         */
1374        ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done,
1375                                                        10*HZ);
1376        if (ret == 0)
1377                DRM_ERROR("[CRTC:%d:%s] cleanup_done timed out\n",
1378                          crtc->base.id, crtc->name);
1379
1380        drm_crtc_commit_put(stall_commit);
1381
1382        return ret < 0 ? ret : 0;
1383}
1384
1385/**
1386 * drm_atomic_helper_setup_commit - setup possibly nonblocking commit
1387 * @state: new modeset state to be committed
1388 * @nonblock: whether nonblocking behavior is requested.
1389 *
1390 * This function prepares @state to be used by the atomic helper's support for
1391 * nonblocking commits. Drivers using the nonblocking commit infrastructure
1392 * should always call this function from their ->atomic_commit hook.
1393 *
1394 * To be able to use this support drivers need to use a few more helper
1395 * functions. drm_atomic_helper_wait_for_dependencies() must be called before
1396 * actually committing the hardware state, and for nonblocking commits this call
1397 * must be placed in the async worker. See also drm_atomic_helper_swap_state()
1398 * and it's stall parameter, for when a driver's commit hooks look at the
1399 * ->state pointers of struct &drm_crtc, &drm_plane or &drm_connector directly.
1400 *
1401 * Completion of the hardware commit step must be signalled using
1402 * drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
1403 * to read or change any permanent software or hardware modeset state. The only
1404 * exception is state protected by other means than &drm_modeset_lock locks.
1405 * Only the free standing @state with pointers to the old state structures can
1406 * be inspected, e.g. to clean up old buffers using
1407 * drm_atomic_helper_cleanup_planes().
1408 *
1409 * At the very end, before cleaning up @state drivers must call
1410 * drm_atomic_helper_commit_cleanup_done().
1411 *
1412 * This is all implemented by in drm_atomic_helper_commit(), giving drivers a
1413 * complete and esay-to-use default implementation of the atomic_commit() hook.
1414 *
1415 * The tracking of asynchronously executed and still pending commits is done
1416 * using the core structure &drm_crtc_commit.
1417 *
1418 * By default there's no need to clean up resources allocated by this function
1419 * explicitly: drm_atomic_state_default_clear() will take care of that
1420 * automatically.
1421 *
1422 * Returns:
1423 *
1424 * 0 on success. -EBUSY when userspace schedules nonblocking commits too fast,
1425 * -ENOMEM on allocation failures and -EINTR when a signal is pending.
1426 */
1427int drm_atomic_helper_setup_commit(struct drm_atomic_state *state,
1428                                   bool nonblock)
1429{
1430        struct drm_crtc *crtc;
1431        struct drm_crtc_state *crtc_state;
1432        struct drm_crtc_commit *commit;
1433        int i, ret;
1434
1435        for_each_crtc_in_state(state, crtc, crtc_state, i) {
1436                commit = kzalloc(sizeof(*commit), GFP_KERNEL);
1437                if (!commit)
1438                        return -ENOMEM;
1439
1440                init_completion(&commit->flip_done);
1441                init_completion(&commit->hw_done);
1442                init_completion(&commit->cleanup_done);
1443                INIT_LIST_HEAD(&commit->commit_entry);
1444                kref_init(&commit->ref);
1445                commit->crtc = crtc;
1446
1447                state->crtcs[i].commit = commit;
1448
1449                ret = stall_checks(crtc, nonblock);
1450                if (ret)
1451                        return ret;
1452
1453                /* Drivers only send out events when at least either current or
1454                 * new CRTC state is active. Complete right away if everything
1455                 * stays off. */
1456                if (!crtc->state->active && !crtc_state->active) {
1457                        complete_all(&commit->flip_done);
1458                        continue;
1459                }
1460
1461                /* Legacy cursor updates are fully unsynced. */
1462                if (state->legacy_cursor_update) {
1463                        complete_all(&commit->flip_done);
1464                        continue;
1465                }
1466
1467                if (!crtc_state->event) {
1468                        commit->event = kzalloc(sizeof(*commit->event),
1469                                                GFP_KERNEL);
1470                        if (!commit->event)
1471                                return -ENOMEM;
1472
1473                        crtc_state->event = commit->event;
1474                }
1475
1476                crtc_state->event->base.completion = &commit->flip_done;
1477        }
1478
1479        return 0;
1480}
1481EXPORT_SYMBOL(drm_atomic_helper_setup_commit);
1482
1483
1484static struct drm_crtc_commit *preceeding_commit(struct drm_crtc *crtc)
1485{
1486        struct drm_crtc_commit *commit;
1487        int i = 0;
1488
1489        list_for_each_entry(commit, &crtc->commit_list, commit_entry) {
1490                /* skip the first entry, that's the current commit */
1491                if (i == 1)
1492                        return commit;
1493                i++;
1494        }
1495
1496        return NULL;
1497}
1498
1499/**
1500 * drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits
1501 * @state: new modeset state to be committed
1502 *
1503 * This function waits for all preceeding commits that touch the same CRTC as
1504 * @state to both be committed to the hardware (as signalled by
1505 * drm_atomic_helper_commit_hw_done) and executed by the hardware (as signalled
1506 * by calling drm_crtc_vblank_send_event on the event member of
1507 * &drm_crtc_state).
1508 *
1509 * This is part of the atomic helper support for nonblocking commits, see
1510 * drm_atomic_helper_setup_commit() for an overview.
1511 */
1512void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state)
1513{
1514        struct drm_crtc *crtc;
1515        struct drm_crtc_state *crtc_state;
1516        struct drm_crtc_commit *commit;
1517        int i;
1518        long ret;
1519
1520        for_each_crtc_in_state(state, crtc, crtc_state, i) {
1521                spin_lock(&crtc->commit_lock);
1522                commit = preceeding_commit(crtc);
1523                if (commit)
1524                        drm_crtc_commit_get(commit);
1525                spin_unlock(&crtc->commit_lock);
1526
1527                if (!commit)
1528                        continue;
1529
1530                ret = wait_for_completion_timeout(&commit->hw_done,
1531                                                  10*HZ);
1532                if (ret == 0)
1533                        DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
1534                                  crtc->base.id, crtc->name);
1535
1536                /* Currently no support for overwriting flips, hence
1537                 * stall for previous one to execute completely. */
1538                ret = wait_for_completion_timeout(&commit->flip_done,
1539                                                  10*HZ);
1540                if (ret == 0)
1541                        DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
1542                                  crtc->base.id, crtc->name);
1543
1544                drm_crtc_commit_put(commit);
1545        }
1546}
1547EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies);
1548
1549/**
1550 * drm_atomic_helper_commit_hw_done - setup possible nonblocking commit
1551 * @state: new modeset state to be committed
1552 *
1553 * This function is used to signal completion of the hardware commit step. After
1554 * this step the driver is not allowed to read or change any permanent software
1555 * or hardware modeset state. The only exception is state protected by other
1556 * means than &drm_modeset_lock locks.
1557 *
1558 * Drivers should try to postpone any expensive or delayed cleanup work after
1559 * this function is called.
1560 *
1561 * This is part of the atomic helper support for nonblocking commits, see
1562 * drm_atomic_helper_setup_commit() for an overview.
1563 */
1564void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state)
1565{
1566        struct drm_crtc *crtc;
1567        struct drm_crtc_state *crtc_state;
1568        struct drm_crtc_commit *commit;
1569        int i;
1570
1571        for_each_crtc_in_state(state, crtc, crtc_state, i) {
1572                commit = state->crtcs[i].commit;
1573                if (!commit)
1574                        continue;
1575
1576                /* backend must have consumed any event by now */
1577                WARN_ON(crtc->state->event);
1578                spin_lock(&crtc->commit_lock);
1579                complete_all(&commit->hw_done);
1580                spin_unlock(&crtc->commit_lock);
1581        }
1582}
1583EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
1584
1585/**
1586 * drm_atomic_helper_commit_cleanup_done - signal completion of commit
1587 * @state: new modeset state to be committed
1588 *
1589 * This signals completion of the atomic update @state, including any cleanup
1590 * work. If used, it must be called right before calling
1591 * drm_atomic_state_free().
1592 *
1593 * This is part of the atomic helper support for nonblocking commits, see
1594 * drm_atomic_helper_setup_commit() for an overview.
1595 */
1596void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state)
1597{
1598        struct drm_crtc *crtc;
1599        struct drm_crtc_state *crtc_state;
1600        struct drm_crtc_commit *commit;
1601        int i;
1602        long ret;
1603
1604        for_each_crtc_in_state(state, crtc, crtc_state, i) {
1605                commit = state->crtcs[i].commit;
1606                if (WARN_ON(!commit))
1607                        continue;
1608
1609                spin_lock(&crtc->commit_lock);
1610                complete_all(&commit->cleanup_done);
1611                WARN_ON(!try_wait_for_completion(&commit->hw_done));
1612
1613                /* commit_list borrows our reference, need to remove before we
1614                 * clean up our drm_atomic_state. But only after it actually
1615                 * completed, otherwise subsequent commits won't stall properly. */
1616                if (try_wait_for_completion(&commit->flip_done))
1617                        goto del_commit;
1618
1619                spin_unlock(&crtc->commit_lock);
1620
1621                /* We must wait for the vblank event to signal our completion
1622                 * before releasing our reference, since the vblank work does
1623                 * not hold a reference of its own. */
1624                ret = wait_for_completion_timeout(&commit->flip_done,
1625                                                  10*HZ);
1626                if (ret == 0)
1627                        DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
1628                                  crtc->base.id, crtc->name);
1629
1630                spin_lock(&crtc->commit_lock);
1631del_commit:
1632                list_del(&commit->commit_entry);
1633                spin_unlock(&crtc->commit_lock);
1634        }
1635}
1636EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
1637
1638/**
1639 * drm_atomic_helper_prepare_planes - prepare plane resources before commit
1640 * @dev: DRM device
1641 * @state: atomic state object with new state structures
1642 *
1643 * This function prepares plane state, specifically framebuffers, for the new
1644 * configuration. If any failure is encountered this function will call
1645 * ->cleanup_fb on any already successfully prepared framebuffer.
1646 *
1647 * Returns:
1648 * 0 on success, negative error code on failure.
1649 */
1650int drm_atomic_helper_prepare_planes(struct drm_device *dev,
1651                                     struct drm_atomic_state *state)
1652{
1653        struct drm_plane *plane;
1654        struct drm_plane_state *plane_state;
1655        int ret, i, j;
1656
1657        for_each_plane_in_state(state, plane, plane_state, i) {
1658                const struct drm_plane_helper_funcs *funcs;
1659
1660                funcs = plane->helper_private;
1661
1662                if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
1663                        continue;
1664
1665                if (funcs->prepare_fb) {
1666                        ret = funcs->prepare_fb(plane, plane_state);
1667                        if (ret)
1668                                goto fail;
1669                }
1670        }
1671
1672        return 0;
1673
1674fail:
1675        for_each_plane_in_state(state, plane, plane_state, j) {
1676                const struct drm_plane_helper_funcs *funcs;
1677
1678                if (j >= i)
1679                        continue;
1680
1681                if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc))
1682                        continue;
1683
1684                funcs = plane->helper_private;
1685
1686                if (funcs->cleanup_fb)
1687                        funcs->cleanup_fb(plane, plane_state);
1688        }
1689
1690        return ret;
1691}
1692EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1693
1694static bool plane_crtc_active(const struct drm_plane_state *state)
1695{
1696        return state->crtc && state->crtc->state->active;
1697}
1698
1699/**
1700 * drm_atomic_helper_commit_planes - commit plane state
1701 * @dev: DRM device
1702 * @old_state: atomic state object with old state structures
1703 * @flags: flags for committing plane state
1704 *
1705 * This function commits the new plane state using the plane and atomic helper
1706 * functions for planes and crtcs. It assumes that the atomic state has already
1707 * been pushed into the relevant object state pointers, since this step can no
1708 * longer fail.
1709 *
1710 * It still requires the global state object @old_state to know which planes and
1711 * crtcs need to be updated though.
1712 *
1713 * Note that this function does all plane updates across all CRTCs in one step.
1714 * If the hardware can't support this approach look at
1715 * drm_atomic_helper_commit_planes_on_crtc() instead.
1716 *
1717 * Plane parameters can be updated by applications while the associated CRTC is
1718 * disabled. The DRM/KMS core will store the parameters in the plane state,
1719 * which will be available to the driver when the CRTC is turned on. As a result
1720 * most drivers don't need to be immediately notified of plane updates for a
1721 * disabled CRTC.
1722 *
1723 * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in
1724 * @flags in order not to receive plane update notifications related to a
1725 * disabled CRTC. This avoids the need to manually ignore plane updates in
1726 * driver code when the driver and/or hardware can't or just don't need to deal
1727 * with updates on disabled CRTCs, for example when supporting runtime PM.
1728 *
1729 * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
1730 * display controllers require to disable a CRTC's planes when the CRTC is
1731 * disabled. This function would skip the ->atomic_disable call for a plane if
1732 * the CRTC of the old plane state needs a modesetting operation. Of course,
1733 * the drivers need to disable the planes in their CRTC disable callbacks
1734 * since no one else would do that.
1735 *
1736 * The drm_atomic_helper_commit() default implementation doesn't set the
1737 * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
1738 * This should not be copied blindly by drivers.
1739 */
1740void drm_atomic_helper_commit_planes(struct drm_device *dev,
1741                                     struct drm_atomic_state *old_state,
1742                                     uint32_t flags)
1743{
1744        struct drm_crtc *crtc;
1745        struct drm_crtc_state *old_crtc_state;
1746        struct drm_plane *plane;
1747        struct drm_plane_state *old_plane_state;
1748        int i;
1749        bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY;
1750        bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET;
1751
1752        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1753                const struct drm_crtc_helper_funcs *funcs;
1754
1755                funcs = crtc->helper_private;
1756
1757                if (!funcs || !funcs->atomic_begin)
1758                        continue;
1759
1760                if (active_only && !crtc->state->active)
1761                        continue;
1762
1763                funcs->atomic_begin(crtc, old_crtc_state);
1764        }
1765
1766        for_each_plane_in_state(old_state, plane, old_plane_state, i) {
1767                const struct drm_plane_helper_funcs *funcs;
1768                bool disabling;
1769
1770                funcs = plane->helper_private;
1771
1772                if (!funcs)
1773                        continue;
1774
1775                disabling = drm_atomic_plane_disabling(plane, old_plane_state);
1776
1777                if (active_only) {
1778                        /*
1779                         * Skip planes related to inactive CRTCs. If the plane
1780                         * is enabled use the state of the current CRTC. If the
1781                         * plane is being disabled use the state of the old
1782                         * CRTC to avoid skipping planes being disabled on an
1783                         * active CRTC.
1784                         */
1785                        if (!disabling && !plane_crtc_active(plane->state))
1786                                continue;
1787                        if (disabling && !plane_crtc_active(old_plane_state))
1788                                continue;
1789                }
1790
1791                /*
1792                 * Special-case disabling the plane if drivers support it.
1793                 */
1794                if (disabling && funcs->atomic_disable) {
1795                        struct drm_crtc_state *crtc_state;
1796
1797                        crtc_state = old_plane_state->crtc->state;
1798
1799                        if (drm_atomic_crtc_needs_modeset(crtc_state) &&
1800                            no_disable)
1801                                continue;
1802
1803                        funcs->atomic_disable(plane, old_plane_state);
1804                } else if (plane->state->crtc || disabling) {
1805                        funcs->atomic_update(plane, old_plane_state);
1806                }
1807        }
1808
1809        for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1810                const struct drm_crtc_helper_funcs *funcs;
1811
1812                funcs = crtc->helper_private;
1813
1814                if (!funcs || !funcs->atomic_flush)
1815                        continue;
1816
1817                if (active_only && !crtc->state->active)
1818                        continue;
1819
1820                funcs->atomic_flush(crtc, old_crtc_state);
1821        }
1822}
1823EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1824
1825/**
1826 * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc
1827 * @old_crtc_state: atomic state object with the old crtc state
1828 *
1829 * This function commits the new plane state using the plane and atomic helper
1830 * functions for planes on the specific crtc. It assumes that the atomic state
1831 * has already been pushed into the relevant object state pointers, since this
1832 * step can no longer fail.
1833 *
1834 * This function is useful when plane updates should be done crtc-by-crtc
1835 * instead of one global step like drm_atomic_helper_commit_planes() does.
1836 *
1837 * This function can only be savely used when planes are not allowed to move
1838 * between different CRTCs because this function doesn't handle inter-CRTC
1839 * depencies. Callers need to ensure that either no such depencies exist,
1840 * resolve them through ordering of commit calls or through some other means.
1841 */
1842void
1843drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
1844{
1845        const struct drm_crtc_helper_funcs *crtc_funcs;
1846        struct drm_crtc *crtc = old_crtc_state->crtc;
1847        struct drm_atomic_state *old_state = old_crtc_state->state;
1848        struct drm_plane *plane;
1849        unsigned plane_mask;
1850
1851        plane_mask = old_crtc_state->plane_mask;
1852        plane_mask |= crtc->state->plane_mask;
1853
1854        crtc_funcs = crtc->helper_private;
1855        if (crtc_funcs && crtc_funcs->atomic_begin)
1856                crtc_funcs->atomic_begin(crtc, old_crtc_state);
1857
1858        drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
1859                struct drm_plane_state *old_plane_state =
1860                        drm_atomic_get_existing_plane_state(old_state, plane);
1861                const struct drm_plane_helper_funcs *plane_funcs;
1862
1863                plane_funcs = plane->helper_private;
1864
1865                if (!old_plane_state || !plane_funcs)
1866                        continue;
1867
1868                WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
1869
1870                if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1871                    plane_funcs->atomic_disable)
1872                        plane_funcs->atomic_disable(plane, old_plane_state);
1873                else if (plane->state->crtc ||
1874                         drm_atomic_plane_disabling(plane, old_plane_state))
1875                        plane_funcs->atomic_update(plane, old_plane_state);
1876        }
1877
1878        if (crtc_funcs && crtc_funcs->atomic_flush)
1879                crtc_funcs->atomic_flush(crtc, old_crtc_state);
1880}
1881EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
1882
1883/**
1884 * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes
1885 * @old_crtc_state: atomic state object with the old CRTC state
1886 * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks
1887 *
1888 * Disables all planes associated with the given CRTC. This can be
1889 * used for instance in the CRTC helper atomic_disable callback to disable
1890 * all planes.
1891 *
1892 * If the atomic-parameter is set the function calls the CRTC's
1893 * atomic_begin hook before and atomic_flush hook after disabling the
1894 * planes.
1895 *
1896 * It is a bug to call this function without having implemented the
1897 * ->atomic_disable() plane hook.
1898 */
1899void
1900drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
1901                                         bool atomic)
1902{
1903        struct drm_crtc *crtc = old_crtc_state->crtc;
1904        const struct drm_crtc_helper_funcs *crtc_funcs =
1905                crtc->helper_private;
1906        struct drm_plane *plane;
1907
1908        if (atomic && crtc_funcs && crtc_funcs->atomic_begin)
1909                crtc_funcs->atomic_begin(crtc, NULL);
1910
1911        drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
1912                const struct drm_plane_helper_funcs *plane_funcs =
1913                        plane->helper_private;
1914
1915                if (!plane_funcs)
1916                        continue;
1917
1918                WARN_ON(!plane_funcs->atomic_disable);
1919                if (plane_funcs->atomic_disable)
1920                        plane_funcs->atomic_disable(plane, NULL);
1921        }
1922
1923        if (atomic && crtc_funcs && crtc_funcs->atomic_flush)
1924                crtc_funcs->atomic_flush(crtc, NULL);
1925}
1926EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc);
1927
1928/**
1929 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1930 * @dev: DRM device
1931 * @old_state: atomic state object with old state structures
1932 *
1933 * This function cleans up plane state, specifically framebuffers, from the old
1934 * configuration. Hence the old configuration must be perserved in @old_state to
1935 * be able to call this function.
1936 *
1937 * This function must also be called on the new state when the atomic update
1938 * fails at any point after calling drm_atomic_helper_prepare_planes().
1939 */
1940void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1941                                      struct drm_atomic_state *old_state)
1942{
1943        struct drm_plane *plane;
1944        struct drm_plane_state *plane_state;
1945        int i;
1946
1947        for_each_plane_in_state(old_state, plane, plane_state, i) {
1948                const struct drm_plane_helper_funcs *funcs;
1949
1950                if (!drm_atomic_helper_framebuffer_changed(dev, old_state, plane_state->crtc))
1951                        continue;
1952
1953                funcs = plane->helper_private;
1954
1955                if (funcs->cleanup_fb)
1956                        funcs->cleanup_fb(plane, plane_state);
1957        }
1958}
1959EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1960
1961/**
1962 * drm_atomic_helper_swap_state - store atomic state into current sw state
1963 * @state: atomic state
1964 * @stall: stall for proceeding commits
1965 *
1966 * This function stores the atomic state into the current state pointers in all
1967 * driver objects. It should be called after all failing steps have been done
1968 * and succeeded, but before the actual hardware state is committed.
1969 *
1970 * For cleanup and error recovery the current state for all changed objects will
1971 * be swaped into @state.
1972 *
1973 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1974 *
1975 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1976 *
1977 * 2. Do any other steps that might fail.
1978 *
1979 * 3. Put the staged state into the current state pointers with this function.
1980 *
1981 * 4. Actually commit the hardware state.
1982 *
1983 * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3
1984 * contains the old state. Also do any other cleanup required with that state.
1985 *
1986 * @stall must be set when nonblocking commits for this driver directly access
1987 * the ->state pointer of &drm_plane, &drm_crtc or &drm_connector. With the
1988 * current atomic helpers this is almost always the case, since the helpers
1989 * don't pass the right state structures to the callbacks.
1990 */
1991void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
1992                                  bool stall)
1993{
1994        int i;
1995        long ret;
1996        struct drm_connector *connector;
1997        struct drm_connector_state *conn_state;
1998        struct drm_crtc *crtc;
1999        struct drm_crtc_state *crtc_state;
2000        struct drm_plane *plane;
2001        struct drm_plane_state *plane_state;
2002        struct drm_crtc_commit *commit;
2003
2004        if (stall) {
2005                for_each_crtc_in_state(state, crtc, crtc_state, i) {
2006                        spin_lock(&crtc->commit_lock);
2007                        commit = list_first_entry_or_null(&crtc->commit_list,
2008                                        struct drm_crtc_commit, commit_entry);
2009                        if (commit)
2010                                drm_crtc_commit_get(commit);
2011                        spin_unlock(&crtc->commit_lock);
2012
2013                        if (!commit)
2014                                continue;
2015
2016                        ret = wait_for_completion_timeout(&commit->hw_done,
2017                                                          10*HZ);
2018                        if (ret == 0)
2019                                DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n",
2020                                          crtc->base.id, crtc->name);
2021                        drm_crtc_commit_put(commit);
2022                }
2023        }
2024
2025        for_each_connector_in_state(state, connector, conn_state, i) {
2026                connector->state->state = state;
2027                swap(state->connectors[i].state, connector->state);
2028                connector->state->state = NULL;
2029        }
2030
2031        for_each_crtc_in_state(state, crtc, crtc_state, i) {
2032                crtc->state->state = state;
2033                swap(state->crtcs[i].state, crtc->state);
2034                crtc->state->state = NULL;
2035
2036                if (state->crtcs[i].commit) {
2037                        spin_lock(&crtc->commit_lock);
2038                        list_add(&state->crtcs[i].commit->commit_entry,
2039                                 &crtc->commit_list);
2040                        spin_unlock(&crtc->commit_lock);
2041
2042                        state->crtcs[i].commit->event = NULL;
2043                }
2044        }
2045
2046        for_each_plane_in_state(state, plane, plane_state, i) {
2047                plane->state->state = state;
2048                swap(state->planes[i].state, plane->state);
2049                plane->state->state = NULL;
2050        }
2051}
2052EXPORT_SYMBOL(drm_atomic_helper_swap_state);
2053
2054/**
2055 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
2056 * @plane: plane object to update
2057 * @crtc: owning CRTC of owning plane
2058 * @fb: framebuffer to flip onto plane
2059 * @crtc_x: x offset of primary plane on crtc
2060 * @crtc_y: y offset of primary plane on crtc
2061 * @crtc_w: width of primary plane rectangle on crtc
2062 * @crtc_h: height of primary plane rectangle on crtc
2063 * @src_x: x offset of @fb for panning
2064 * @src_y: y offset of @fb for panning
2065 * @src_w: width of source rectangle in @fb
2066 * @src_h: height of source rectangle in @fb
2067 *
2068 * Provides a default plane update handler using the atomic driver interface.
2069 *
2070 * RETURNS:
2071 * Zero on success, error code on failure
2072 */
2073int drm_atomic_helper_update_plane(struct drm_plane *plane,
2074                                   struct drm_crtc *crtc,
2075                                   struct drm_framebuffer *fb,
2076                                   int crtc_x, int crtc_y,
2077                                   unsigned int crtc_w, unsigned int crtc_h,
2078                                   uint32_t src_x, uint32_t src_y,
2079                                   uint32_t src_w, uint32_t src_h)
2080{
2081        struct drm_atomic_state *state;
2082        struct drm_plane_state *plane_state;
2083        int ret = 0;
2084
2085        state = drm_atomic_state_alloc(plane->dev);
2086        if (!state)
2087                return -ENOMEM;
2088
2089        state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
2090retry:
2091        plane_state = drm_atomic_get_plane_state(state, plane);
2092        if (IS_ERR(plane_state)) {
2093                ret = PTR_ERR(plane_state);
2094                goto fail;
2095        }
2096
2097        ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
2098        if (ret != 0)
2099                goto fail;
2100        drm_atomic_set_fb_for_plane(plane_state, fb);
2101        plane_state->crtc_x = crtc_x;
2102        plane_state->crtc_y = crtc_y;
2103        plane_state->crtc_w = crtc_w;
2104        plane_state->crtc_h = crtc_h;
2105        plane_state->src_x = src_x;
2106        plane_state->src_y = src_y;
2107        plane_state->src_w = src_w;
2108        plane_state->src_h = src_h;
2109
2110        if (plane == crtc->cursor)
2111                state->legacy_cursor_update = true;
2112
2113        ret = drm_atomic_commit(state);
2114        if (ret != 0)
2115                goto fail;
2116
2117        /* Driver takes ownership of state on successful commit. */
2118        return 0;
2119fail:
2120        if (ret == -EDEADLK)
2121                goto backoff;
2122
2123        drm_atomic_state_free(state);
2124
2125        return ret;
2126backoff:
2127        drm_atomic_state_clear(state);
2128        drm_atomic_legacy_backoff(state);
2129
2130        /*
2131         * Someone might have exchanged the framebuffer while we dropped locks
2132         * in the backoff code. We need to fix up the fb refcount tracking the
2133         * core does for us.
2134         */
2135        plane->old_fb = plane->fb;
2136
2137        goto retry;
2138}
2139EXPORT_SYMBOL(drm_atomic_helper_update_plane);
2140
2141/**
2142 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
2143 * @plane: plane to disable
2144 *
2145 * Provides a default plane disable handler using the atomic driver interface.
2146 *
2147 * RETURNS:
2148 * Zero on success, error code on failure
2149 */
2150int drm_atomic_helper_disable_plane(struct drm_plane *plane)
2151{
2152        struct drm_atomic_state *state;
2153        struct drm_plane_state *plane_state;
2154        int ret = 0;
2155
2156        /*
2157         * FIXME: Without plane->crtc set we can't get at the implicit legacy
2158         * acquire context. The real fix will be to wire the acquire ctx through
2159         * everywhere we need it, but meanwhile prevent chaos by just skipping
2160         * this noop. The critical case is the cursor ioctls which a) only grab
2161         * crtc/cursor-plane locks (so we need the crtc to get at the right
2162         * acquire context) and b) can try to disable the plane multiple times.
2163         */
2164        if (!plane->crtc)
2165                return 0;
2166
2167        state = drm_atomic_state_alloc(plane->dev);
2168        if (!state)
2169                return -ENOMEM;
2170
2171        state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
2172retry:
2173        plane_state = drm_atomic_get_plane_state(state, plane);
2174        if (IS_ERR(plane_state)) {
2175                ret = PTR_ERR(plane_state);
2176                goto fail;
2177        }
2178
2179        if (plane_state->crtc && (plane == plane->crtc->cursor))
2180                plane_state->state->legacy_cursor_update = true;
2181
2182        ret = __drm_atomic_helper_disable_plane(plane, plane_state);
2183        if (ret != 0)
2184                goto fail;
2185
2186        ret = drm_atomic_commit(state);
2187        if (ret != 0)
2188                goto fail;
2189
2190        /* Driver takes ownership of state on successful commit. */
2191        return 0;
2192fail:
2193        if (ret == -EDEADLK)
2194                goto backoff;
2195
2196        drm_atomic_state_free(state);
2197
2198        return ret;
2199backoff:
2200        drm_atomic_state_clear(state);
2201        drm_atomic_legacy_backoff(state);
2202
2203        /*
2204         * Someone might have exchanged the framebuffer while we dropped locks
2205         * in the backoff code. We need to fix up the fb refcount tracking the
2206         * core does for us.
2207         */
2208        plane->old_fb = plane->fb;
2209
2210        goto retry;
2211}
2212EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
2213
2214/* just used from fb-helper and atomic-helper: */
2215int __drm_atomic_helper_disable_plane(struct drm_plane *plane,
2216                struct drm_plane_state *plane_state)
2217{
2218        int ret;
2219
2220        ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
2221        if (ret != 0)
2222                return ret;
2223
2224        drm_atomic_set_fb_for_plane(plane_state, NULL);
2225        plane_state->crtc_x = 0;
2226        plane_state->crtc_y = 0;
2227        plane_state->crtc_w = 0;
2228        plane_state->crtc_h = 0;
2229        plane_state->src_x = 0;
2230        plane_state->src_y = 0;
2231        plane_state->src_w = 0;
2232        plane_state->src_h = 0;
2233
2234        return 0;
2235}
2236
2237static int update_output_state(struct drm_atomic_state *state,
2238                               struct drm_mode_set *set)
2239{
2240        struct drm_device *dev = set->crtc->dev;
2241        struct drm_crtc *crtc;
2242        struct drm_crtc_state *crtc_state;
2243        struct drm_connector *connector;
2244        struct drm_connector_state *conn_state;
2245        int ret, i;
2246
2247        ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
2248                               state->acquire_ctx);
2249        if (ret)
2250                return ret;
2251
2252        /* First disable all connectors on the target crtc. */
2253        ret = drm_atomic_add_affected_connectors(state, set->crtc);
2254        if (ret)
2255                return ret;
2256
2257        for_each_connector_in_state(state, connector, conn_state, i) {
2258                if (conn_state->crtc == set->crtc) {
2259                        ret = drm_atomic_set_crtc_for_connector(conn_state,
2260                                                                NULL);
2261                        if (ret)
2262                                return ret;
2263                }
2264        }
2265
2266        /* Then set all connectors from set->connectors on the target crtc */
2267        for (i = 0; i < set->num_connectors; i++) {
2268                conn_state = drm_atomic_get_connector_state(state,
2269                                                            set->connectors[i]);
2270                if (IS_ERR(conn_state))
2271                        return PTR_ERR(conn_state);
2272
2273                ret = drm_atomic_set_crtc_for_connector(conn_state,
2274                                                        set->crtc);
2275                if (ret)
2276                        return ret;
2277        }
2278
2279        for_each_crtc_in_state(state, crtc, crtc_state, i) {
2280                /* Don't update ->enable for the CRTC in the set_config request,
2281                 * since a mismatch would indicate a bug in the upper layers.
2282                 * The actual modeset code later on will catch any
2283                 * inconsistencies here. */
2284                if (crtc == set->crtc)
2285                        continue;
2286
2287                if (!crtc_state->connector_mask) {
2288                        ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
2289                                                                NULL);
2290                        if (ret < 0)
2291                                return ret;
2292
2293                        crtc_state->active = false;
2294                }
2295        }
2296
2297        return 0;
2298}
2299
2300/**
2301 * drm_atomic_helper_set_config - set a new config from userspace
2302 * @set: mode set configuration
2303 *
2304 * Provides a default crtc set_config handler using the atomic driver interface.
2305 *
2306 * Returns:
2307 * Returns 0 on success, negative errno numbers on failure.
2308 */
2309int drm_atomic_helper_set_config(struct drm_mode_set *set)
2310{
2311        struct drm_atomic_state *state;
2312        struct drm_crtc *crtc = set->crtc;
2313        int ret = 0;
2314
2315        state = drm_atomic_state_alloc(crtc->dev);
2316        if (!state)
2317                return -ENOMEM;
2318
2319        state->legacy_set_config = true;
2320        state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
2321retry:
2322        ret = __drm_atomic_helper_set_config(set, state);
2323        if (ret != 0)
2324                goto fail;
2325
2326        ret = drm_atomic_commit(state);
2327        if (ret != 0)
2328                goto fail;
2329
2330        /* Driver takes ownership of state on successful commit. */
2331        return 0;
2332fail:
2333        if (ret == -EDEADLK)
2334                goto backoff;
2335
2336        drm_atomic_state_free(state);
2337
2338        return ret;
2339backoff:
2340        drm_atomic_state_clear(state);
2341        drm_atomic_legacy_backoff(state);
2342
2343        /*
2344         * Someone might have exchanged the framebuffer while we dropped locks
2345         * in the backoff code. We need to fix up the fb refcount tracking the
2346         * core does for us.
2347         */
2348        crtc->primary->old_fb = crtc->primary->fb;
2349
2350        goto retry;
2351}
2352EXPORT_SYMBOL(drm_atomic_helper_set_config);
2353
2354/* just used from fb-helper and atomic-helper: */
2355int __drm_atomic_helper_set_config(struct drm_mode_set *set,
2356                struct drm_atomic_state *state)
2357{
2358        struct drm_crtc_state *crtc_state;
2359        struct drm_plane_state *primary_state;
2360        struct drm_crtc *crtc = set->crtc;
2361        int hdisplay, vdisplay;
2362        int ret;
2363
2364        crtc_state = drm_atomic_get_crtc_state(state, crtc);
2365        if (IS_ERR(crtc_state))
2366                return PTR_ERR(crtc_state);
2367
2368        primary_state = drm_atomic_get_plane_state(state, crtc->primary);
2369        if (IS_ERR(primary_state))
2370                return PTR_ERR(primary_state);
2371
2372        if (!set->mode) {
2373                WARN_ON(set->fb);
2374                WARN_ON(set->num_connectors);
2375
2376                ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
2377                if (ret != 0)
2378                        return ret;
2379
2380                crtc_state->active = false;
2381
2382                ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
2383                if (ret != 0)
2384                        return ret;
2385
2386                drm_atomic_set_fb_for_plane(primary_state, NULL);
2387
2388                goto commit;
2389        }
2390
2391        WARN_ON(!set->fb);
2392        WARN_ON(!set->num_connectors);
2393
2394        ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
2395        if (ret != 0)
2396                return ret;
2397
2398        crtc_state->active = true;
2399
2400        ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
2401        if (ret != 0)
2402                return ret;
2403
2404        drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay);
2405
2406        drm_atomic_set_fb_for_plane(primary_state, set->fb);
2407        primary_state->crtc_x = 0;
2408        primary_state->crtc_y = 0;
2409        primary_state->crtc_w = hdisplay;
2410        primary_state->crtc_h = vdisplay;
2411        primary_state->src_x = set->x << 16;
2412        primary_state->src_y = set->y << 16;
2413        if (primary_state->rotation & (DRM_ROTATE_90 | DRM_ROTATE_270)) {
2414                primary_state->src_w = vdisplay << 16;
2415                primary_state->src_h = hdisplay << 16;
2416        } else {
2417                primary_state->src_w = hdisplay << 16;
2418                primary_state->src_h = vdisplay << 16;
2419        }
2420
2421commit:
2422        ret = update_output_state(state, set);
2423        if (ret)
2424                return ret;
2425
2426        return 0;
2427}
2428
2429/**
2430 * drm_atomic_helper_disable_all - disable all currently active outputs
2431 * @dev: DRM device
2432 * @ctx: lock acquisition context
2433 *
2434 * Loops through all connectors, finding those that aren't turned off and then
2435 * turns them off by setting their DPMS mode to OFF and deactivating the CRTC
2436 * that they are connected to.
2437 *
2438 * This is used for example in suspend/resume to disable all currently active
2439 * functions when suspending.
2440 *
2441 * Note that if callers haven't already acquired all modeset locks this might
2442 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
2443 *
2444 * Returns:
2445 * 0 on success or a negative error code on failure.
2446 *
2447 * See also:
2448 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
2449 */
2450int drm_atomic_helper_disable_all(struct drm_device *dev,
2451                                  struct drm_modeset_acquire_ctx *ctx)
2452{
2453        struct drm_atomic_state *state;
2454        struct drm_connector *conn;
2455        int err;
2456
2457        state = drm_atomic_state_alloc(dev);
2458        if (!state)
2459                return -ENOMEM;
2460
2461        state->acquire_ctx = ctx;
2462
2463        drm_for_each_connector(conn, dev) {
2464                struct drm_crtc *crtc = conn->state->crtc;
2465                struct drm_crtc_state *crtc_state;
2466
2467                if (!crtc || conn->dpms != DRM_MODE_DPMS_ON)
2468                        continue;
2469
2470                crtc_state = drm_atomic_get_crtc_state(state, crtc);
2471                if (IS_ERR(crtc_state)) {
2472                        err = PTR_ERR(crtc_state);
2473                        goto free;
2474                }
2475
2476                crtc_state->active = false;
2477        }
2478
2479        err = drm_atomic_commit(state);
2480
2481free:
2482        if (err < 0)
2483                drm_atomic_state_free(state);
2484
2485        return err;
2486}
2487EXPORT_SYMBOL(drm_atomic_helper_disable_all);
2488
2489/**
2490 * drm_atomic_helper_suspend - subsystem-level suspend helper
2491 * @dev: DRM device
2492 *
2493 * Duplicates the current atomic state, disables all active outputs and then
2494 * returns a pointer to the original atomic state to the caller. Drivers can
2495 * pass this pointer to the drm_atomic_helper_resume() helper upon resume to
2496 * restore the output configuration that was active at the time the system
2497 * entered suspend.
2498 *
2499 * Note that it is potentially unsafe to use this. The atomic state object
2500 * returned by this function is assumed to be persistent. Drivers must ensure
2501 * that this holds true. Before calling this function, drivers must make sure
2502 * to suspend fbdev emulation so that nothing can be using the device.
2503 *
2504 * Returns:
2505 * A pointer to a copy of the state before suspend on success or an ERR_PTR()-
2506 * encoded error code on failure. Drivers should store the returned atomic
2507 * state object and pass it to the drm_atomic_helper_resume() helper upon
2508 * resume.
2509 *
2510 * See also:
2511 * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(),
2512 * drm_atomic_helper_resume()
2513 */
2514struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
2515{
2516        struct drm_modeset_acquire_ctx ctx;
2517        struct drm_atomic_state *state;
2518        int err;
2519
2520        drm_modeset_acquire_init(&ctx, 0);
2521
2522retry:
2523        err = drm_modeset_lock_all_ctx(dev, &ctx);
2524        if (err < 0) {
2525                state = ERR_PTR(err);
2526                goto unlock;
2527        }
2528
2529        state = drm_atomic_helper_duplicate_state(dev, &ctx);
2530        if (IS_ERR(state))
2531                goto unlock;
2532
2533        err = drm_atomic_helper_disable_all(dev, &ctx);
2534        if (err < 0) {
2535                drm_atomic_state_free(state);
2536                state = ERR_PTR(err);
2537                goto unlock;
2538        }
2539
2540unlock:
2541        if (PTR_ERR(state) == -EDEADLK) {
2542                drm_modeset_backoff(&ctx);
2543                goto retry;
2544        }
2545
2546        drm_modeset_drop_locks(&ctx);
2547        drm_modeset_acquire_fini(&ctx);
2548        return state;
2549}
2550EXPORT_SYMBOL(drm_atomic_helper_suspend);
2551
2552/**
2553 * drm_atomic_helper_resume - subsystem-level resume helper
2554 * @dev: DRM device
2555 * @state: atomic state to resume to
2556 *
2557 * Calls drm_mode_config_reset() to synchronize hardware and software states,
2558 * grabs all modeset locks and commits the atomic state object. This can be
2559 * used in conjunction with the drm_atomic_helper_suspend() helper to
2560 * implement suspend/resume for drivers that support atomic mode-setting.
2561 *
2562 * Returns:
2563 * 0 on success or a negative error code on failure.
2564 *
2565 * See also:
2566 * drm_atomic_helper_suspend()
2567 */
2568int drm_atomic_helper_resume(struct drm_device *dev,
2569                             struct drm_atomic_state *state)
2570{
2571        struct drm_mode_config *config = &dev->mode_config;
2572        int err;
2573
2574        drm_mode_config_reset(dev);
2575        drm_modeset_lock_all(dev);
2576        state->acquire_ctx = config->acquire_ctx;
2577        err = drm_atomic_commit(state);
2578        drm_modeset_unlock_all(dev);
2579
2580        return err;
2581}
2582EXPORT_SYMBOL(drm_atomic_helper_resume);
2583
2584/**
2585 * drm_atomic_helper_crtc_set_property - helper for crtc properties
2586 * @crtc: DRM crtc
2587 * @property: DRM property
2588 * @val: value of property
2589 *
2590 * Provides a default crtc set_property handler using the atomic driver
2591 * interface.
2592 *
2593 * RETURNS:
2594 * Zero on success, error code on failure
2595 */
2596int
2597drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
2598                                    struct drm_property *property,
2599                                    uint64_t val)
2600{
2601        struct drm_atomic_state *state;
2602        struct drm_crtc_state *crtc_state;
2603        int ret = 0;
2604
2605        state = drm_atomic_state_alloc(crtc->dev);
2606        if (!state)
2607                return -ENOMEM;
2608
2609        /* ->set_property is always called with all locks held. */
2610        state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
2611retry:
2612        crtc_state = drm_atomic_get_crtc_state(state, crtc);
2613        if (IS_ERR(crtc_state)) {
2614                ret = PTR_ERR(crtc_state);
2615                goto fail;
2616        }
2617
2618        ret = drm_atomic_crtc_set_property(crtc, crtc_state,
2619                        property, val);
2620        if (ret)
2621                goto fail;
2622
2623        ret = drm_atomic_commit(state);
2624        if (ret != 0)
2625                goto fail;
2626
2627        /* Driver takes ownership of state on successful commit. */
2628        return 0;
2629fail:
2630        if (ret == -EDEADLK)
2631                goto backoff;
2632
2633        drm_atomic_state_free(state);
2634
2635        return ret;
2636backoff:
2637        drm_atomic_state_clear(state);
2638        drm_atomic_legacy_backoff(state);
2639
2640        goto retry;
2641}
2642EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
2643
2644/**
2645 * drm_atomic_helper_plane_set_property - helper for plane properties
2646 * @plane: DRM plane
2647 * @property: DRM property
2648 * @val: value of property
2649 *
2650 * Provides a default plane set_property handler using the atomic driver
2651 * interface.
2652 *
2653 * RETURNS:
2654 * Zero on success, error code on failure
2655 */
2656int
2657drm_atomic_helper_plane_set_property(struct drm_plane *plane,
2658                                    struct drm_property *property,
2659                                    uint64_t val)
2660{
2661        struct drm_atomic_state *state;
2662        struct drm_plane_state *plane_state;
2663        int ret = 0;
2664
2665        state = drm_atomic_state_alloc(plane->dev);
2666        if (!state)
2667                return -ENOMEM;
2668
2669        /* ->set_property is always called with all locks held. */
2670        state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
2671retry:
2672        plane_state = drm_atomic_get_plane_state(state, plane);
2673        if (IS_ERR(plane_state)) {
2674                ret = PTR_ERR(plane_state);
2675                goto fail;
2676        }
2677
2678        ret = drm_atomic_plane_set_property(plane, plane_state,
2679                        property, val);
2680        if (ret)
2681                goto fail;
2682
2683        ret = drm_atomic_commit(state);
2684        if (ret != 0)
2685                goto fail;
2686
2687        /* Driver takes ownership of state on successful commit. */
2688        return 0;
2689fail:
2690        if (ret == -EDEADLK)
2691                goto backoff;
2692
2693        drm_atomic_state_free(state);
2694
2695        return ret;
2696backoff:
2697        drm_atomic_state_clear(state);
2698        drm_atomic_legacy_backoff(state);
2699
2700        goto retry;
2701}
2702EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
2703
2704/**
2705 * drm_atomic_helper_connector_set_property - helper for connector properties
2706 * @connector: DRM connector
2707 * @property: DRM property
2708 * @val: value of property
2709 *
2710 * Provides a default connector set_property handler using the atomic driver
2711 * interface.
2712 *
2713 * RETURNS:
2714 * Zero on success, error code on failure
2715 */
2716int
2717drm_atomic_helper_connector_set_property(struct drm_connector *connector,
2718                                    struct drm_property *property,
2719                                    uint64_t val)
2720{
2721        struct drm_atomic_state *state;
2722        struct drm_connector_state *connector_state;
2723        int ret = 0;
2724
2725        state = drm_atomic_state_alloc(connector->dev);
2726        if (!state)
2727                return -ENOMEM;
2728
2729        /* ->set_property is always called with all locks held. */
2730        state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
2731retry:
2732        connector_state = drm_atomic_get_connector_state(state, connector);
2733        if (IS_ERR(connector_state)) {
2734                ret = PTR_ERR(connector_state);
2735                goto fail;
2736        }
2737
2738        ret = drm_atomic_connector_set_property(connector, connector_state,
2739                        property, val);
2740        if (ret)
2741                goto fail;
2742
2743        ret = drm_atomic_commit(state);
2744        if (ret != 0)
2745                goto fail;
2746
2747        /* Driver takes ownership of state on successful commit. */
2748        return 0;
2749fail:
2750        if (ret == -EDEADLK)
2751                goto backoff;
2752
2753        drm_atomic_state_free(state);
2754
2755        return ret;
2756backoff:
2757        drm_atomic_state_clear(state);
2758        drm_atomic_legacy_backoff(state);
2759
2760        goto retry;
2761}
2762EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
2763
2764/**
2765 * drm_atomic_helper_page_flip - execute a legacy page flip
2766 * @crtc: DRM crtc
2767 * @fb: DRM framebuffer
2768 * @event: optional DRM event to signal upon completion
2769 * @flags: flip flags for non-vblank sync'ed updates
2770 *
2771 * Provides a default page flip implementation using the atomic driver interface.
2772 *
2773 * Note that for now so called async page flips (i.e. updates which are not
2774 * synchronized to vblank) are not supported, since the atomic interfaces have
2775 * no provisions for this yet.
2776 *
2777 * Returns:
2778 * Returns 0 on success, negative errno numbers on failure.
2779 */
2780int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
2781                                struct drm_framebuffer *fb,
2782                                struct drm_pending_vblank_event *event,
2783                                uint32_t flags)
2784{
2785        struct drm_plane *plane = crtc->primary;
2786        struct drm_atomic_state *state;
2787        struct drm_plane_state *plane_state;
2788        struct drm_crtc_state *crtc_state;
2789        int ret = 0;
2790
2791        if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
2792                return -EINVAL;
2793
2794        state = drm_atomic_state_alloc(plane->dev);
2795        if (!state)
2796                return -ENOMEM;
2797
2798        state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
2799retry:
2800        crtc_state = drm_atomic_get_crtc_state(state, crtc);
2801        if (IS_ERR(crtc_state)) {
2802                ret = PTR_ERR(crtc_state);
2803                goto fail;
2804        }
2805        crtc_state->event = event;
2806
2807        plane_state = drm_atomic_get_plane_state(state, plane);
2808        if (IS_ERR(plane_state)) {
2809                ret = PTR_ERR(plane_state);
2810                goto fail;
2811        }
2812
2813        ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
2814        if (ret != 0)
2815                goto fail;
2816        drm_atomic_set_fb_for_plane(plane_state, fb);
2817
2818        /* Make sure we don't accidentally do a full modeset. */
2819        state->allow_modeset = false;
2820        if (!crtc_state->active) {
2821                DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n",
2822                                 crtc->base.id);
2823                ret = -EINVAL;
2824                goto fail;
2825        }
2826
2827        ret = drm_atomic_nonblocking_commit(state);
2828        if (ret != 0)
2829                goto fail;
2830
2831        /* Driver takes ownership of state on successful commit. */
2832        return 0;
2833fail:
2834        if (ret == -EDEADLK)
2835                goto backoff;
2836
2837        drm_atomic_state_free(state);
2838
2839        return ret;
2840backoff:
2841        drm_atomic_state_clear(state);
2842        drm_atomic_legacy_backoff(state);
2843
2844        /*
2845         * Someone might have exchanged the framebuffer while we dropped locks
2846         * in the backoff code. We need to fix up the fb refcount tracking the
2847         * core does for us.
2848         */
2849        plane->old_fb = plane->fb;
2850
2851        goto retry;
2852}
2853EXPORT_SYMBOL(drm_atomic_helper_page_flip);
2854
2855/**
2856 * drm_atomic_helper_connector_dpms() - connector dpms helper implementation
2857 * @connector: affected connector
2858 * @mode: DPMS mode
2859 *
2860 * This is the main helper function provided by the atomic helper framework for
2861 * implementing the legacy DPMS connector interface. It computes the new desired
2862 * ->active state for the corresponding CRTC (if the connector is enabled) and
2863 * updates it.
2864 *
2865 * Returns:
2866 * Returns 0 on success, negative errno numbers on failure.
2867 */
2868int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
2869                                     int mode)
2870{
2871        struct drm_mode_config *config = &connector->dev->mode_config;
2872        struct drm_atomic_state *state;
2873        struct drm_crtc_state *crtc_state;
2874        struct drm_crtc *crtc;
2875        struct drm_connector *tmp_connector;
2876        int ret;
2877        bool active = false;
2878        int old_mode = connector->dpms;
2879
2880        if (mode != DRM_MODE_DPMS_ON)
2881                mode = DRM_MODE_DPMS_OFF;
2882
2883        connector->dpms = mode;
2884        crtc = connector->state->crtc;
2885
2886        if (!crtc)
2887                return 0;
2888
2889        state = drm_atomic_state_alloc(connector->dev);
2890        if (!state)
2891                return -ENOMEM;
2892
2893        state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
2894retry:
2895        crtc_state = drm_atomic_get_crtc_state(state, crtc);
2896        if (IS_ERR(crtc_state)) {
2897                ret = PTR_ERR(crtc_state);
2898                goto fail;
2899        }
2900
2901        WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
2902
2903        drm_for_each_connector(tmp_connector, connector->dev) {
2904                if (tmp_connector->state->crtc != crtc)
2905                        continue;
2906
2907                if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
2908                        active = true;
2909                        break;
2910                }
2911        }
2912        crtc_state->active = active;
2913
2914        ret = drm_atomic_commit(state);
2915        if (ret != 0)
2916                goto fail;
2917
2918        /* Driver takes ownership of state on successful commit. */
2919        return 0;
2920fail:
2921        if (ret == -EDEADLK)
2922                goto backoff;
2923
2924        connector->dpms = old_mode;
2925        drm_atomic_state_free(state);
2926
2927        return ret;
2928backoff:
2929        drm_atomic_state_clear(state);
2930        drm_atomic_legacy_backoff(state);
2931
2932        goto retry;
2933}
2934EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
2935
2936/**
2937 * drm_atomic_helper_best_encoder - Helper for &drm_connector_helper_funcs
2938 *                                  ->best_encoder callback
2939 * @connector: Connector control structure
2940 *
2941 * This is a &drm_connector_helper_funcs ->best_encoder callback helper for
2942 * connectors that support exactly 1 encoder, statically determined at driver
2943 * init time.
2944 */
2945struct drm_encoder *
2946drm_atomic_helper_best_encoder(struct drm_connector *connector)
2947{
2948        WARN_ON(connector->encoder_ids[1]);
2949        return drm_encoder_find(connector->dev, connector->encoder_ids[0]);
2950}
2951EXPORT_SYMBOL(drm_atomic_helper_best_encoder);
2952
2953/**
2954 * DOC: atomic state reset and initialization
2955 *
2956 * Both the drm core and the atomic helpers assume that there is always the full
2957 * and correct atomic software state for all connectors, CRTCs and planes
2958 * available. Which is a bit a problem on driver load and also after system
2959 * suspend. One way to solve this is to have a hardware state read-out
2960 * infrastructure which reconstructs the full software state (e.g. the i915
2961 * driver).
2962 *
2963 * The simpler solution is to just reset the software state to everything off,
2964 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
2965 * the atomic helpers provide default reset implementations for all hooks.
2966 *
2967 * On the upside the precise state tracking of atomic simplifies system suspend
2968 * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe
2969 * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume().
2970 * For other drivers the building blocks are split out, see the documentation
2971 * for these functions.
2972 */
2973
2974/**
2975 * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
2976 * @crtc: drm CRTC
2977 *
2978 * Resets the atomic state for @crtc by freeing the state pointer (which might
2979 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2980 */
2981void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
2982{
2983        if (crtc->state)
2984                __drm_atomic_helper_crtc_destroy_state(crtc->state);
2985
2986        kfree(crtc->state);
2987        crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
2988
2989        if (crtc->state)
2990                crtc->state->crtc = crtc;
2991}
2992EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
2993
2994/**
2995 * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
2996 * @crtc: CRTC object
2997 * @state: atomic CRTC state
2998 *
2999 * Copies atomic state from a CRTC's current state and resets inferred values.
3000 * This is useful for drivers that subclass the CRTC state.
3001 */
3002void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
3003                                              struct drm_crtc_state *state)
3004{
3005        memcpy(state, crtc->state, sizeof(*state));
3006
3007        if (state->mode_blob)
3008                drm_property_reference_blob(state->mode_blob);
3009        if (state->degamma_lut)
3010                drm_property_reference_blob(state->degamma_lut);
3011        if (state->ctm)
3012                drm_property_reference_blob(state->ctm);
3013        if (state->gamma_lut)
3014                drm_property_reference_blob(state->gamma_lut);
3015        state->mode_changed = false;
3016        state->active_changed = false;
3017        state->planes_changed = false;
3018        state->connectors_changed = false;
3019        state->color_mgmt_changed = false;
3020        state->zpos_changed = false;
3021        state->event = NULL;
3022}
3023EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
3024
3025/**
3026 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
3027 * @crtc: drm CRTC
3028 *
3029 * Default CRTC state duplicate hook for drivers which don't have their own
3030 * subclassed CRTC state structure.
3031 */
3032struct drm_crtc_state *
3033drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
3034{
3035        struct drm_crtc_state *state;
3036
3037        if (WARN_ON(!crtc->state))
3038                return NULL;
3039
3040        state = kmalloc(sizeof(*state), GFP_KERNEL);
3041        if (state)
3042                __drm_atomic_helper_crtc_duplicate_state(crtc, state);
3043
3044        return state;
3045}
3046EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
3047
3048/**
3049 * __drm_atomic_helper_crtc_destroy_state - release CRTC state
3050 * @state: CRTC state object to release
3051 *
3052 * Releases all resources stored in the CRTC state without actually freeing
3053 * the memory of the CRTC state. This is useful for drivers that subclass the
3054 * CRTC state.
3055 */
3056void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
3057{
3058        drm_property_unreference_blob(state->mode_blob);
3059        drm_property_unreference_blob(state->degamma_lut);
3060        drm_property_unreference_blob(state->ctm);
3061        drm_property_unreference_blob(state->gamma_lut);
3062}
3063EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
3064
3065/**
3066 * drm_atomic_helper_crtc_destroy_state - default state destroy hook
3067 * @crtc: drm CRTC
3068 * @state: CRTC state object to release
3069 *
3070 * Default CRTC state destroy hook for drivers which don't have their own
3071 * subclassed CRTC state structure.
3072 */
3073void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
3074                                          struct drm_crtc_state *state)
3075{
3076        __drm_atomic_helper_crtc_destroy_state(state);
3077        kfree(state);
3078}
3079EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
3080
3081/**
3082 * drm_atomic_helper_plane_reset - default ->reset hook for planes
3083 * @plane: drm plane
3084 *
3085 * Resets the atomic state for @plane by freeing the state pointer (which might
3086 * be NULL, e.g. at driver load time) and allocating a new empty state object.
3087 */
3088void drm_atomic_helper_plane_reset(struct drm_plane *plane)
3089{
3090        if (plane->state)
3091                __drm_atomic_helper_plane_destroy_state(plane->state);
3092
3093        kfree(plane->state);
3094        plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
3095
3096        if (plane->state) {
3097                plane->state->plane = plane;
3098                plane->state->rotation = DRM_ROTATE_0;
3099        }
3100}
3101EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
3102
3103/**
3104 * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
3105 * @plane: plane object
3106 * @state: atomic plane state
3107 *
3108 * Copies atomic state from a plane's current state. This is useful for
3109 * drivers that subclass the plane state.
3110 */
3111void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
3112                                               struct drm_plane_state *state)
3113{
3114        memcpy(state, plane->state, sizeof(*state));
3115
3116        if (state->fb)
3117                drm_framebuffer_reference(state->fb);
3118
3119        state->fence = NULL;
3120}
3121EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
3122
3123/**
3124 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
3125 * @plane: drm plane
3126 *
3127 * Default plane state duplicate hook for drivers which don't have their own
3128 * subclassed plane state structure.
3129 */
3130struct drm_plane_state *
3131drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
3132{
3133        struct drm_plane_state *state;
3134
3135        if (WARN_ON(!plane->state))
3136                return NULL;
3137
3138        state = kmalloc(sizeof(*state), GFP_KERNEL);
3139        if (state)
3140                __drm_atomic_helper_plane_duplicate_state(plane, state);
3141
3142        return state;
3143}
3144EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
3145
3146/**
3147 * __drm_atomic_helper_plane_destroy_state - release plane state
3148 * @state: plane state object to release
3149 *
3150 * Releases all resources stored in the plane state without actually freeing
3151 * the memory of the plane state. This is useful for drivers that subclass the
3152 * plane state.
3153 */
3154void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
3155{
3156        if (state->fb)
3157                drm_framebuffer_unreference(state->fb);
3158}
3159EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
3160
3161/**
3162 * drm_atomic_helper_plane_destroy_state - default state destroy hook
3163 * @plane: drm plane
3164 * @state: plane state object to release
3165 *
3166 * Default plane state destroy hook for drivers which don't have their own
3167 * subclassed plane state structure.
3168 */
3169void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
3170                                           struct drm_plane_state *state)
3171{
3172        __drm_atomic_helper_plane_destroy_state(state);
3173        kfree(state);
3174}
3175EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
3176
3177/**
3178 * __drm_atomic_helper_connector_reset - reset state on connector
3179 * @connector: drm connector
3180 * @conn_state: connector state to assign
3181 *
3182 * Initializes the newly allocated @conn_state and assigns it to
3183 * #connector ->state, usually required when initializing the drivers
3184 * or when called from the ->reset hook.
3185 *
3186 * This is useful for drivers that subclass the connector state.
3187 */
3188void
3189__drm_atomic_helper_connector_reset(struct drm_connector *connector,
3190                                    struct drm_connector_state *conn_state)
3191{
3192        if (conn_state)
3193                conn_state->connector = connector;
3194
3195        connector->state = conn_state;
3196}
3197EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
3198
3199/**
3200 * drm_atomic_helper_connector_reset - default ->reset hook for connectors
3201 * @connector: drm connector
3202 *
3203 * Resets the atomic state for @connector by freeing the state pointer (which
3204 * might be NULL, e.g. at driver load time) and allocating a new empty state
3205 * object.
3206 */
3207void drm_atomic_helper_connector_reset(struct drm_connector *connector)
3208{
3209        struct drm_connector_state *conn_state =
3210                kzalloc(sizeof(*conn_state), GFP_KERNEL);
3211
3212        if (connector->state)
3213                __drm_atomic_helper_connector_destroy_state(connector->state);
3214
3215        kfree(connector->state);
3216        __drm_atomic_helper_connector_reset(connector, conn_state);
3217}
3218EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
3219
3220/**
3221 * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
3222 * @connector: connector object
3223 * @state: atomic connector state
3224 *
3225 * Copies atomic state from a connector's current state. This is useful for
3226 * drivers that subclass the connector state.
3227 */
3228void
3229__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
3230                                            struct drm_connector_state *state)
3231{
3232        memcpy(state, connector->state, sizeof(*state));
3233        if (state->crtc)
3234                drm_connector_reference(connector);
3235}
3236EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
3237
3238/**
3239 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
3240 * @connector: drm connector
3241 *
3242 * Default connector state duplicate hook for drivers which don't have their own
3243 * subclassed connector state structure.
3244 */
3245struct drm_connector_state *
3246drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
3247{
3248        struct drm_connector_state *state;
3249
3250        if (WARN_ON(!connector->state))
3251                return NULL;
3252
3253        state = kmalloc(sizeof(*state), GFP_KERNEL);
3254        if (state)
3255                __drm_atomic_helper_connector_duplicate_state(connector, state);
3256
3257        return state;
3258}
3259EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
3260
3261/**
3262 * drm_atomic_helper_duplicate_state - duplicate an atomic state object
3263 * @dev: DRM device
3264 * @ctx: lock acquisition context
3265 *
3266 * Makes a copy of the current atomic state by looping over all objects and
3267 * duplicating their respective states. This is used for example by suspend/
3268 * resume support code to save the state prior to suspend such that it can
3269 * be restored upon resume.
3270 *
3271 * Note that this treats atomic state as persistent between save and restore.
3272 * Drivers must make sure that this is possible and won't result in confusion
3273 * or erroneous behaviour.
3274 *
3275 * Note that if callers haven't already acquired all modeset locks this might
3276 * return -EDEADLK, which must be handled by calling drm_modeset_backoff().
3277 *
3278 * Returns:
3279 * A pointer to the copy of the atomic state object on success or an
3280 * ERR_PTR()-encoded error code on failure.
3281 *
3282 * See also:
3283 * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
3284 */
3285struct drm_atomic_state *
3286drm_atomic_helper_duplicate_state(struct drm_device *dev,
3287                                  struct drm_modeset_acquire_ctx *ctx)
3288{
3289        struct drm_atomic_state *state;
3290        struct drm_connector *conn;
3291        struct drm_plane *plane;
3292        struct drm_crtc *crtc;
3293        int err = 0;
3294
3295        state = drm_atomic_state_alloc(dev);
3296        if (!state)
3297                return ERR_PTR(-ENOMEM);
3298
3299        state->acquire_ctx = ctx;
3300
3301        drm_for_each_crtc(crtc, dev) {
3302                struct drm_crtc_state *crtc_state;
3303
3304                crtc_state = drm_atomic_get_crtc_state(state, crtc);
3305                if (IS_ERR(crtc_state)) {
3306                        err = PTR_ERR(crtc_state);
3307                        goto free;
3308                }
3309        }
3310
3311        drm_for_each_plane(plane, dev) {
3312                struct drm_plane_state *plane_state;
3313
3314                plane_state = drm_atomic_get_plane_state(state, plane);
3315                if (IS_ERR(plane_state)) {
3316                        err = PTR_ERR(plane_state);
3317                        goto free;
3318                }
3319        }
3320
3321        drm_for_each_connector(conn, dev) {
3322                struct drm_connector_state *conn_state;
3323
3324                conn_state = drm_atomic_get_connector_state(state, conn);
3325                if (IS_ERR(conn_state)) {
3326                        err = PTR_ERR(conn_state);
3327                        goto free;
3328                }
3329        }
3330
3331        /* clear the acquire context so that it isn't accidentally reused */
3332        state->acquire_ctx = NULL;
3333
3334free:
3335        if (err < 0) {
3336                drm_atomic_state_free(state);
3337                state = ERR_PTR(err);
3338        }
3339
3340        return state;
3341}
3342EXPORT_SYMBOL(drm_atomic_helper_duplicate_state);
3343
3344/**
3345 * __drm_atomic_helper_connector_destroy_state - release connector state
3346 * @state: connector state object to release
3347 *
3348 * Releases all resources stored in the connector state without actually
3349 * freeing the memory of the connector state. This is useful for drivers that
3350 * subclass the connector state.
3351 */
3352void
3353__drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
3354{
3355        /*
3356         * This is currently a placeholder so that drivers that subclass the
3357         * state will automatically do the right thing if code is ever added
3358         * to this function.
3359         */
3360        if (state->crtc)
3361                drm_connector_unreference(state->connector);
3362}
3363EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
3364
3365/**
3366 * drm_atomic_helper_connector_destroy_state - default state destroy hook
3367 * @connector: drm connector
3368 * @state: connector state object to release
3369 *
3370 * Default connector state destroy hook for drivers which don't have their own
3371 * subclassed connector state structure.
3372 */
3373void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
3374                                          struct drm_connector_state *state)
3375{
3376        __drm_atomic_helper_connector_destroy_state(state);
3377        kfree(state);
3378}
3379EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
3380
3381/**
3382 * drm_atomic_helper_legacy_gamma_set - set the legacy gamma correction table
3383 * @crtc: CRTC object
3384 * @red: red correction table
3385 * @green: green correction table
3386 * @blue: green correction table
3387 * @size: size of the tables
3388 *
3389 * Implements support for legacy gamma correction table for drivers
3390 * that support color management through the DEGAMMA_LUT/GAMMA_LUT
3391 * properties.
3392 */
3393int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
3394                                       u16 *red, u16 *green, u16 *blue,
3395                                       uint32_t size)
3396{
3397        struct drm_device *dev = crtc->dev;
3398        struct drm_mode_config *config = &dev->mode_config;
3399        struct drm_atomic_state *state;
3400        struct drm_crtc_state *crtc_state;
3401        struct drm_property_blob *blob = NULL;
3402        struct drm_color_lut *blob_data;
3403        int i, ret = 0;
3404
3405        state = drm_atomic_state_alloc(crtc->dev);
3406        if (!state)
3407                return -ENOMEM;
3408
3409        blob = drm_property_create_blob(dev,
3410                                        sizeof(struct drm_color_lut) * size,
3411                                        NULL);
3412        if (IS_ERR(blob)) {
3413                ret = PTR_ERR(blob);
3414                blob = NULL;
3415                goto fail;
3416        }
3417
3418        /* Prepare GAMMA_LUT with the legacy values. */
3419        blob_data = (struct drm_color_lut *) blob->data;
3420        for (i = 0; i < size; i++) {
3421                blob_data[i].red = red[i];
3422                blob_data[i].green = green[i];
3423                blob_data[i].blue = blue[i];
3424        }
3425
3426        state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
3427retry:
3428        crtc_state = drm_atomic_get_crtc_state(state, crtc);
3429        if (IS_ERR(crtc_state)) {
3430                ret = PTR_ERR(crtc_state);
3431                goto fail;
3432        }
3433
3434        /* Reset DEGAMMA_LUT and CTM properties. */
3435        ret = drm_atomic_crtc_set_property(crtc, crtc_state,
3436                        config->degamma_lut_property, 0);
3437        if (ret)
3438                goto fail;
3439
3440        ret = drm_atomic_crtc_set_property(crtc, crtc_state,
3441                        config->ctm_property, 0);
3442        if (ret)
3443                goto fail;
3444
3445        ret = drm_atomic_crtc_set_property(crtc, crtc_state,
3446                        config->gamma_lut_property, blob->base.id);
3447        if (ret)
3448                goto fail;
3449
3450        ret = drm_atomic_commit(state);
3451        if (ret)
3452                goto fail;
3453
3454        /* Driver takes ownership of state on successful commit. */
3455
3456        drm_property_unreference_blob(blob);
3457
3458        return 0;
3459fail:
3460        if (ret == -EDEADLK)
3461                goto backoff;
3462
3463        drm_atomic_state_free(state);
3464        drm_property_unreference_blob(blob);
3465
3466        return ret;
3467backoff:
3468        drm_atomic_state_clear(state);
3469        drm_atomic_legacy_backoff(state);
3470
3471        goto retry;
3472}
3473EXPORT_SYMBOL(drm_atomic_helper_legacy_gamma_set);
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