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-rw-r--r--drivers/gpu/drm/drm_atomic_helper.c1966
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diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
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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/**
36 * DOC: overview
37 *
38 * This helper library provides implementations of check and commit functions on
39 * top of the CRTC modeset helper callbacks and the plane helper callbacks. It
40 * also provides convenience implementations for the atomic state handling
41 * callbacks for drivers which don't need to subclass the drm core structures to
42 * add their own additional internal state.
43 *
44 * This library also provides default implementations for the check callback in
45 * drm_atomic_helper_check and for the commit callback with
46 * drm_atomic_helper_commit. But the individual stages and callbacks are expose
47 * to allow drivers to mix and match and e.g. use the plane helpers only
48 * together with a driver private modeset implementation.
49 *
50 * This library also provides implementations for all the legacy driver
51 * interfaces on top of the atomic interface. See drm_atomic_helper_set_config,
52 * drm_atomic_helper_disable_plane, drm_atomic_helper_disable_plane and the
53 * various functions to implement set_property callbacks. New drivers must not
54 * implement these functions themselves but must use the provided helpers.
55 */
56static void
57drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
58 struct drm_plane_state *plane_state,
59 struct drm_plane *plane)
60{
61 struct drm_crtc_state *crtc_state;
62
63 if (plane->state->crtc) {
64 crtc_state = state->crtc_states[drm_crtc_index(plane->crtc)];
65
66 if (WARN_ON(!crtc_state))
67 return;
68
69 crtc_state->planes_changed = true;
70 }
71
72 if (plane_state->crtc) {
73 crtc_state =
74 state->crtc_states[drm_crtc_index(plane_state->crtc)];
75
76 if (WARN_ON(!crtc_state))
77 return;
78
79 crtc_state->planes_changed = true;
80 }
81}
82
83static struct drm_crtc *
84get_current_crtc_for_encoder(struct drm_device *dev,
85 struct drm_encoder *encoder)
86{
87 struct drm_mode_config *config = &dev->mode_config;
88 struct drm_connector *connector;
89
90 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
91
92 list_for_each_entry(connector, &config->connector_list, head) {
93 if (connector->state->best_encoder != encoder)
94 continue;
95
96 return connector->state->crtc;
97 }
98
99 return NULL;
100}
101
102static int
103steal_encoder(struct drm_atomic_state *state,
104 struct drm_encoder *encoder,
105 struct drm_crtc *encoder_crtc)
106{
107 struct drm_mode_config *config = &state->dev->mode_config;
108 struct drm_crtc_state *crtc_state;
109 struct drm_connector *connector;
110 struct drm_connector_state *connector_state;
111 int ret;
112
113 /*
114 * We can only steal an encoder coming from a connector, which means we
115 * must already hold the connection_mutex.
116 */
117 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
118
119 DRM_DEBUG_KMS("[ENCODER:%d:%s] in use on [CRTC:%d], stealing it\n",
120 encoder->base.id, encoder->name,
121 encoder_crtc->base.id);
122
123 crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
124 if (IS_ERR(crtc_state))
125 return PTR_ERR(crtc_state);
126
127 crtc_state->mode_changed = true;
128
129 list_for_each_entry(connector, &config->connector_list, head) {
130 if (connector->state->best_encoder != encoder)
131 continue;
132
133 DRM_DEBUG_KMS("Stealing encoder from [CONNECTOR:%d:%s]\n",
134 connector->base.id,
135 connector->name);
136
137 connector_state = drm_atomic_get_connector_state(state,
138 connector);
139 if (IS_ERR(connector_state))
140 return PTR_ERR(connector_state);
141
142 ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
143 if (ret)
144 return ret;
145 connector_state->best_encoder = NULL;
146 }
147
148 return 0;
149}
150
151static int
152update_connector_routing(struct drm_atomic_state *state, int conn_idx)
153{
154 struct drm_connector_helper_funcs *funcs;
155 struct drm_encoder *new_encoder;
156 struct drm_crtc *encoder_crtc;
157 struct drm_connector *connector;
158 struct drm_connector_state *connector_state;
159 struct drm_crtc_state *crtc_state;
160 int idx, ret;
161
162 connector = state->connectors[conn_idx];
163 connector_state = state->connector_states[conn_idx];
164
165 if (!connector)
166 return 0;
167
168 DRM_DEBUG_KMS("Updating routing for [CONNECTOR:%d:%s]\n",
169 connector->base.id,
170 connector->name);
171
172 if (connector->state->crtc != connector_state->crtc) {
173 if (connector->state->crtc) {
174 idx = drm_crtc_index(connector->state->crtc);
175
176 crtc_state = state->crtc_states[idx];
177 crtc_state->mode_changed = true;
178 }
179
180 if (connector_state->crtc) {
181 idx = drm_crtc_index(connector_state->crtc);
182
183 crtc_state = state->crtc_states[idx];
184 crtc_state->mode_changed = true;
185 }
186 }
187
188 if (!connector_state->crtc) {
189 DRM_DEBUG_KMS("Disabling [CONNECTOR:%d:%s]\n",
190 connector->base.id,
191 connector->name);
192
193 connector_state->best_encoder = NULL;
194
195 return 0;
196 }
197
198 funcs = connector->helper_private;
199 new_encoder = funcs->best_encoder(connector);
200
201 if (!new_encoder) {
202 DRM_DEBUG_KMS("No suitable encoder found for [CONNECTOR:%d:%s]\n",
203 connector->base.id,
204 connector->name);
205 return -EINVAL;
206 }
207
208 if (new_encoder == connector_state->best_encoder) {
209 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
210 connector->base.id,
211 connector->name,
212 new_encoder->base.id,
213 new_encoder->name,
214 connector_state->crtc->base.id);
215
216 return 0;
217 }
218
219 encoder_crtc = get_current_crtc_for_encoder(state->dev,
220 new_encoder);
221
222 if (encoder_crtc) {
223 ret = steal_encoder(state, new_encoder, encoder_crtc);
224 if (ret) {
225 DRM_DEBUG_KMS("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
226 connector->base.id,
227 connector->name);
228 return ret;
229 }
230 }
231
232 connector_state->best_encoder = new_encoder;
233 idx = drm_crtc_index(connector_state->crtc);
234
235 crtc_state = state->crtc_states[idx];
236 crtc_state->mode_changed = true;
237
238 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
239 connector->base.id,
240 connector->name,
241 new_encoder->base.id,
242 new_encoder->name,
243 connector_state->crtc->base.id);
244
245 return 0;
246}
247
248static int
249mode_fixup(struct drm_atomic_state *state)
250{
251 int ncrtcs = state->dev->mode_config.num_crtc;
252 struct drm_crtc_state *crtc_state;
253 struct drm_connector_state *conn_state;
254 int i;
255 bool ret;
256
257 for (i = 0; i < ncrtcs; i++) {
258 crtc_state = state->crtc_states[i];
259
260 if (!crtc_state || !crtc_state->mode_changed)
261 continue;
262
263 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
264 }
265
266 for (i = 0; i < state->num_connector; i++) {
267 struct drm_encoder_helper_funcs *funcs;
268 struct drm_encoder *encoder;
269
270 conn_state = state->connector_states[i];
271
272 if (!conn_state)
273 continue;
274
275 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
276
277 if (!conn_state->crtc || !conn_state->best_encoder)
278 continue;
279
280 crtc_state =
281 state->crtc_states[drm_crtc_index(conn_state->crtc)];
282
283 /*
284 * Each encoder has at most one connector (since we always steal
285 * it away), so we won't call ->mode_fixup twice.
286 */
287 encoder = conn_state->best_encoder;
288 funcs = encoder->helper_private;
289
290 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
291 ret = encoder->bridge->funcs->mode_fixup(
292 encoder->bridge, &crtc_state->mode,
293 &crtc_state->adjusted_mode);
294 if (!ret) {
295 DRM_DEBUG_KMS("Bridge fixup failed\n");
296 return -EINVAL;
297 }
298 }
299
300
301 ret = funcs->mode_fixup(encoder, &crtc_state->mode,
302 &crtc_state->adjusted_mode);
303 if (!ret) {
304 DRM_DEBUG_KMS("[ENCODER:%d:%s] fixup failed\n",
305 encoder->base.id, encoder->name);
306 return -EINVAL;
307 }
308 }
309
310 for (i = 0; i < ncrtcs; i++) {
311 struct drm_crtc_helper_funcs *funcs;
312 struct drm_crtc *crtc;
313
314 crtc_state = state->crtc_states[i];
315 crtc = state->crtcs[i];
316
317 if (!crtc_state || !crtc_state->mode_changed)
318 continue;
319
320 funcs = crtc->helper_private;
321 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
322 &crtc_state->adjusted_mode);
323 if (!ret) {
324 DRM_DEBUG_KMS("[CRTC:%d] fixup failed\n",
325 crtc->base.id);
326 return -EINVAL;
327 }
328 }
329
330 return 0;
331}
332
333static int
334drm_atomic_helper_check_modeset(struct drm_device *dev,
335 struct drm_atomic_state *state)
336{
337 int ncrtcs = dev->mode_config.num_crtc;
338 struct drm_crtc *crtc;
339 struct drm_crtc_state *crtc_state;
340 int i, ret;
341
342 for (i = 0; i < ncrtcs; i++) {
343 crtc = state->crtcs[i];
344 crtc_state = state->crtc_states[i];
345
346 if (!crtc)
347 continue;
348
349 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
350 DRM_DEBUG_KMS("[CRTC:%d] mode changed\n",
351 crtc->base.id);
352 crtc_state->mode_changed = true;
353 }
354
355 if (crtc->state->enable != crtc_state->enable) {
356 DRM_DEBUG_KMS("[CRTC:%d] enable changed\n",
357 crtc->base.id);
358 crtc_state->mode_changed = true;
359 }
360 }
361
362 for (i = 0; i < state->num_connector; i++) {
363 /*
364 * This only sets crtc->mode_changed for routing changes,
365 * drivers must set crtc->mode_changed themselves when connector
366 * properties need to be updated.
367 */
368 ret = update_connector_routing(state, i);
369 if (ret)
370 return ret;
371 }
372
373 /*
374 * After all the routing has been prepared we need to add in any
375 * connector which is itself unchanged, but who's crtc changes it's
376 * configuration. This must be done before calling mode_fixup in case a
377 * crtc only changed its mode but has the same set of connectors.
378 */
379 for (i = 0; i < ncrtcs; i++) {
380 int num_connectors;
381
382 crtc = state->crtcs[i];
383 crtc_state = state->crtc_states[i];
384
385 if (!crtc || !crtc_state->mode_changed)
386 continue;
387
388 DRM_DEBUG_KMS("[CRTC:%d] needs full modeset, enable: %c\n",
389 crtc->base.id,
390 crtc_state->enable ? 'y' : 'n');
391
392 ret = drm_atomic_add_affected_connectors(state, crtc);
393 if (ret != 0)
394 return ret;
395
396 num_connectors = drm_atomic_connectors_for_crtc(state,
397 crtc);
398
399 if (crtc_state->enable != !!num_connectors) {
400 DRM_DEBUG_KMS("[CRTC:%d] enabled/connectors mismatch\n",
401 crtc->base.id);
402
403 return -EINVAL;
404 }
405 }
406
407 return mode_fixup(state);
408}
409
410/**
411 * drm_atomic_helper_check - validate state object
412 * @dev: DRM device
413 * @state: the driver state object
414 *
415 * Check the state object to see if the requested state is physically possible.
416 * Only crtcs and planes have check callbacks, so for any additional (global)
417 * checking that a driver needs it can simply wrap that around this function.
418 * Drivers without such needs can directly use this as their ->atomic_check()
419 * callback.
420 *
421 * RETURNS
422 * Zero for success or -errno
423 */
424int drm_atomic_helper_check(struct drm_device *dev,
425 struct drm_atomic_state *state)
426{
427 int nplanes = dev->mode_config.num_total_plane;
428 int ncrtcs = dev->mode_config.num_crtc;
429 int i, ret = 0;
430
431 for (i = 0; i < nplanes; i++) {
432 struct drm_plane_helper_funcs *funcs;
433 struct drm_plane *plane = state->planes[i];
434 struct drm_plane_state *plane_state = state->plane_states[i];
435
436 if (!plane)
437 continue;
438
439 funcs = plane->helper_private;
440
441 drm_atomic_helper_plane_changed(state, plane_state, plane);
442
443 if (!funcs || !funcs->atomic_check)
444 continue;
445
446 ret = funcs->atomic_check(plane, plane_state);
447 if (ret) {
448 DRM_DEBUG_KMS("[PLANE:%d] atomic check failed\n",
449 plane->base.id);
450 return ret;
451 }
452 }
453
454 for (i = 0; i < ncrtcs; i++) {
455 struct drm_crtc_helper_funcs *funcs;
456 struct drm_crtc *crtc = state->crtcs[i];
457
458 if (!crtc)
459 continue;
460
461 funcs = crtc->helper_private;
462
463 if (!funcs || !funcs->atomic_check)
464 continue;
465
466 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
467 if (ret) {
468 DRM_DEBUG_KMS("[CRTC:%d] atomic check failed\n",
469 crtc->base.id);
470 return ret;
471 }
472 }
473
474 ret = drm_atomic_helper_check_modeset(dev, state);
475 if (ret)
476 return ret;
477
478 return ret;
479}
480EXPORT_SYMBOL(drm_atomic_helper_check);
481
482static void
483disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
484{
485 int ncrtcs = old_state->dev->mode_config.num_crtc;
486 int i;
487
488 for (i = 0; i < old_state->num_connector; i++) {
489 struct drm_connector_state *old_conn_state;
490 struct drm_connector *connector;
491 struct drm_encoder_helper_funcs *funcs;
492 struct drm_encoder *encoder;
493
494 old_conn_state = old_state->connector_states[i];
495 connector = old_state->connectors[i];
496
497 /* Shut down everything that's in the changeset and currently
498 * still on. So need to check the old, saved state. */
499 if (!old_conn_state || !old_conn_state->crtc)
500 continue;
501
502 encoder = old_conn_state->best_encoder;
503
504 /* We shouldn't get this far if we didn't previously have
505 * an encoder.. but WARN_ON() rather than explode.
506 */
507 if (WARN_ON(!encoder))
508 continue;
509
510 funcs = encoder->helper_private;
511
512 /*
513 * Each encoder has at most one connector (since we always steal
514 * it away), so we won't call call disable hooks twice.
515 */
516 if (encoder->bridge)
517 encoder->bridge->funcs->disable(encoder->bridge);
518
519 /* Right function depends upon target state. */
520 if (connector->state->crtc)
521 funcs->prepare(encoder);
522 else if (funcs->disable)
523 funcs->disable(encoder);
524 else
525 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
526
527 if (encoder->bridge)
528 encoder->bridge->funcs->post_disable(encoder->bridge);
529 }
530
531 for (i = 0; i < ncrtcs; i++) {
532 struct drm_crtc_helper_funcs *funcs;
533 struct drm_crtc *crtc;
534
535 crtc = old_state->crtcs[i];
536
537 /* Shut down everything that needs a full modeset. */
538 if (!crtc || !crtc->state->mode_changed)
539 continue;
540
541 funcs = crtc->helper_private;
542
543 /* Right function depends upon target state. */
544 if (crtc->state->enable)
545 funcs->prepare(crtc);
546 else if (funcs->disable)
547 funcs->disable(crtc);
548 else
549 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
550 }
551}
552
553static void
554set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
555{
556 int ncrtcs = old_state->dev->mode_config.num_crtc;
557 int i;
558
559 /* clear out existing links */
560 for (i = 0; i < old_state->num_connector; i++) {
561 struct drm_connector *connector;
562
563 connector = old_state->connectors[i];
564
565 if (!connector || !connector->encoder)
566 continue;
567
568 WARN_ON(!connector->encoder->crtc);
569
570 connector->encoder->crtc = NULL;
571 connector->encoder = NULL;
572 }
573
574 /* set new links */
575 for (i = 0; i < old_state->num_connector; i++) {
576 struct drm_connector *connector;
577
578 connector = old_state->connectors[i];
579
580 if (!connector || !connector->state->crtc)
581 continue;
582
583 if (WARN_ON(!connector->state->best_encoder))
584 continue;
585
586 connector->encoder = connector->state->best_encoder;
587 connector->encoder->crtc = connector->state->crtc;
588 }
589
590 /* set legacy state in the crtc structure */
591 for (i = 0; i < ncrtcs; i++) {
592 struct drm_crtc *crtc;
593
594 crtc = old_state->crtcs[i];
595
596 if (!crtc)
597 continue;
598
599 crtc->mode = crtc->state->mode;
600 crtc->enabled = crtc->state->enable;
601 crtc->x = crtc->primary->state->src_x >> 16;
602 crtc->y = crtc->primary->state->src_y >> 16;
603 }
604}
605
606static void
607crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
608{
609 int ncrtcs = old_state->dev->mode_config.num_crtc;
610 int i;
611
612 for (i = 0; i < ncrtcs; i++) {
613 struct drm_crtc_helper_funcs *funcs;
614 struct drm_crtc *crtc;
615
616 crtc = old_state->crtcs[i];
617
618 if (!crtc || !crtc->state->mode_changed)
619 continue;
620
621 funcs = crtc->helper_private;
622
623 if (crtc->state->enable)
624 funcs->mode_set_nofb(crtc);
625 }
626
627 for (i = 0; i < old_state->num_connector; i++) {
628 struct drm_connector *connector;
629 struct drm_crtc_state *new_crtc_state;
630 struct drm_encoder_helper_funcs *funcs;
631 struct drm_encoder *encoder;
632 struct drm_display_mode *mode, *adjusted_mode;
633
634 connector = old_state->connectors[i];
635
636 if (!connector || !connector->state->best_encoder)
637 continue;
638
639 encoder = connector->state->best_encoder;
640 funcs = encoder->helper_private;
641 new_crtc_state = connector->state->crtc->state;
642 mode = &new_crtc_state->mode;
643 adjusted_mode = &new_crtc_state->adjusted_mode;
644
645 /*
646 * Each encoder has at most one connector (since we always steal
647 * it away), so we won't call call mode_set hooks twice.
648 */
649 funcs->mode_set(encoder, mode, adjusted_mode);
650
651 if (encoder->bridge && encoder->bridge->funcs->mode_set)
652 encoder->bridge->funcs->mode_set(encoder->bridge,
653 mode, adjusted_mode);
654 }
655}
656
657/**
658 * drm_atomic_helper_commit_pre_planes - modeset commit before plane updates
659 * @dev: DRM device
660 * @state: atomic state
661 *
662 * This function commits the modeset changes that need to be committed before
663 * updating planes. It shuts down all the outputs that need to be shut down and
664 * prepares them (if required) with the new mode.
665 */
666void drm_atomic_helper_commit_pre_planes(struct drm_device *dev,
667 struct drm_atomic_state *state)
668{
669 disable_outputs(dev, state);
670 set_routing_links(dev, state);
671 crtc_set_mode(dev, state);
672}
673EXPORT_SYMBOL(drm_atomic_helper_commit_pre_planes);
674
675/**
676 * drm_atomic_helper_commit_post_planes - modeset commit after plane updates
677 * @dev: DRM device
678 * @old_state: atomic state object with old state structures
679 *
680 * This function commits the modeset changes that need to be committed after
681 * updating planes: It enables all the outputs with the new configuration which
682 * had to be turned off for the update.
683 */
684void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
685 struct drm_atomic_state *old_state)
686{
687 int ncrtcs = old_state->dev->mode_config.num_crtc;
688 int i;
689
690 for (i = 0; i < ncrtcs; i++) {
691 struct drm_crtc_helper_funcs *funcs;
692 struct drm_crtc *crtc;
693
694 crtc = old_state->crtcs[i];
695
696 /* Need to filter out CRTCs where only planes change. */
697 if (!crtc || !crtc->state->mode_changed)
698 continue;
699
700 funcs = crtc->helper_private;
701
702 if (crtc->state->enable)
703 funcs->commit(crtc);
704 }
705
706 for (i = 0; i < old_state->num_connector; i++) {
707 struct drm_connector *connector;
708 struct drm_encoder_helper_funcs *funcs;
709 struct drm_encoder *encoder;
710
711 connector = old_state->connectors[i];
712
713 if (!connector || !connector->state->best_encoder)
714 continue;
715
716 encoder = connector->state->best_encoder;
717 funcs = encoder->helper_private;
718
719 /*
720 * Each encoder has at most one connector (since we always steal
721 * it away), so we won't call call enable hooks twice.
722 */
723 if (encoder->bridge)
724 encoder->bridge->funcs->pre_enable(encoder->bridge);
725
726 funcs->commit(encoder);
727
728 if (encoder->bridge)
729 encoder->bridge->funcs->enable(encoder->bridge);
730 }
731}
732EXPORT_SYMBOL(drm_atomic_helper_commit_post_planes);
733
734static void wait_for_fences(struct drm_device *dev,
735 struct drm_atomic_state *state)
736{
737 int nplanes = dev->mode_config.num_total_plane;
738 int i;
739
740 for (i = 0; i < nplanes; i++) {
741 struct drm_plane *plane = state->planes[i];
742
743 if (!plane || !plane->state->fence)
744 continue;
745
746 WARN_ON(!plane->state->fb);
747
748 fence_wait(plane->state->fence, false);
749 fence_put(plane->state->fence);
750 plane->state->fence = NULL;
751 }
752}
753
754static bool framebuffer_changed(struct drm_device *dev,
755 struct drm_atomic_state *old_state,
756 struct drm_crtc *crtc)
757{
758 struct drm_plane *plane;
759 struct drm_plane_state *old_plane_state;
760 int nplanes = old_state->dev->mode_config.num_total_plane;
761 int i;
762
763 for (i = 0; i < nplanes; i++) {
764 plane = old_state->planes[i];
765 old_plane_state = old_state->plane_states[i];
766
767 if (!plane)
768 continue;
769
770 if (plane->state->crtc != crtc &&
771 old_plane_state->crtc != crtc)
772 continue;
773
774 if (plane->state->fb != old_plane_state->fb)
775 return true;
776 }
777
778 return false;
779}
780
781/**
782 * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
783 * @dev: DRM device
784 * @old_state: atomic state object with old state structures
785 *
786 * Helper to, after atomic commit, wait for vblanks on all effected
787 * crtcs (ie. before cleaning up old framebuffers using
788 * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
789 * framebuffers have actually changed to optimize for the legacy cursor and
790 * plane update use-case.
791 */
792void
793drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
794 struct drm_atomic_state *old_state)
795{
796 struct drm_crtc *crtc;
797 struct drm_crtc_state *old_crtc_state;
798 int ncrtcs = old_state->dev->mode_config.num_crtc;
799 int i, ret;
800
801 for (i = 0; i < ncrtcs; i++) {
802 crtc = old_state->crtcs[i];
803 old_crtc_state = old_state->crtc_states[i];
804
805 if (!crtc)
806 continue;
807
808 /* No one cares about the old state, so abuse it for tracking
809 * and store whether we hold a vblank reference (and should do a
810 * vblank wait) in the ->enable boolean. */
811 old_crtc_state->enable = false;
812
813 if (!crtc->state->enable)
814 continue;
815
816 if (!framebuffer_changed(dev, old_state, crtc))
817 continue;
818
819 ret = drm_crtc_vblank_get(crtc);
820 if (ret != 0)
821 continue;
822
823 old_crtc_state->enable = true;
824 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
825 }
826
827 for (i = 0; i < ncrtcs; i++) {
828 crtc = old_state->crtcs[i];
829 old_crtc_state = old_state->crtc_states[i];
830
831 if (!crtc || !old_crtc_state->enable)
832 continue;
833
834 ret = wait_event_timeout(dev->vblank[i].queue,
835 old_crtc_state->last_vblank_count !=
836 drm_vblank_count(dev, i),
837 msecs_to_jiffies(50));
838
839 drm_crtc_vblank_put(crtc);
840 }
841}
842EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
843
844/**
845 * drm_atomic_helper_commit - commit validated state object
846 * @dev: DRM device
847 * @state: the driver state object
848 * @async: asynchronous commit
849 *
850 * This function commits a with drm_atomic_helper_check() pre-validated state
851 * object. This can still fail when e.g. the framebuffer reservation fails. For
852 * now this doesn't implement asynchronous commits.
853 *
854 * RETURNS
855 * Zero for success or -errno.
856 */
857int drm_atomic_helper_commit(struct drm_device *dev,
858 struct drm_atomic_state *state,
859 bool async)
860{
861 int ret;
862
863 if (async)
864 return -EBUSY;
865
866 ret = drm_atomic_helper_prepare_planes(dev, state);
867 if (ret)
868 return ret;
869
870 /*
871 * This is the point of no return - everything below never fails except
872 * when the hw goes bonghits. Which means we can commit the new state on
873 * the software side now.
874 */
875
876 drm_atomic_helper_swap_state(dev, state);
877
878 /*
879 * Everything below can be run asynchronously without the need to grab
880 * any modeset locks at all under one conditions: It must be guaranteed
881 * that the asynchronous work has either been cancelled (if the driver
882 * supports it, which at least requires that the framebuffers get
883 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
884 * before the new state gets committed on the software side with
885 * drm_atomic_helper_swap_state().
886 *
887 * This scheme allows new atomic state updates to be prepared and
888 * checked in parallel to the asynchronous completion of the previous
889 * update. Which is important since compositors need to figure out the
890 * composition of the next frame right after having submitted the
891 * current layout.
892 */
893
894 wait_for_fences(dev, state);
895
896 drm_atomic_helper_commit_pre_planes(dev, state);
897
898 drm_atomic_helper_commit_planes(dev, state);
899
900 drm_atomic_helper_commit_post_planes(dev, state);
901
902 drm_atomic_helper_wait_for_vblanks(dev, state);
903
904 drm_atomic_helper_cleanup_planes(dev, state);
905
906 drm_atomic_state_free(state);
907
908 return 0;
909}
910EXPORT_SYMBOL(drm_atomic_helper_commit);
911
912/**
913 * DOC: implementing async commit
914 *
915 * For now the atomic helpers don't support async commit directly. If there is
916 * real need it could be added though, using the dma-buf fence infrastructure
917 * for generic synchronization with outstanding rendering.
918 *
919 * For now drivers have to implement async commit themselves, with the following
920 * sequence being the recommended one:
921 *
922 * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
923 * which commit needs to call which can fail, so we want to run it first and
924 * synchronously.
925 *
926 * 2. Synchronize with any outstanding asynchronous commit worker threads which
927 * might be affected the new state update. This can be done by either cancelling
928 * or flushing the work items, depending upon whether the driver can deal with
929 * cancelled updates. Note that it is important to ensure that the framebuffer
930 * cleanup is still done when cancelling.
931 *
932 * For sufficient parallelism it is recommended to have a work item per crtc
933 * (for updates which don't touch global state) and a global one. Then we only
934 * need to synchronize with the crtc work items for changed crtcs and the global
935 * work item, which allows nice concurrent updates on disjoint sets of crtcs.
936 *
937 * 3. The software state is updated synchronously with
938 * drm_atomic_helper_swap_state. Doing this under the protection of all modeset
939 * locks means concurrent callers never see inconsistent state. And doing this
940 * while it's guaranteed that no relevant async worker runs means that async
941 * workers do not need grab any locks. Actually they must not grab locks, for
942 * otherwise the work flushing will deadlock.
943 *
944 * 4. Schedule a work item to do all subsequent steps, using the split-out
945 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
946 * then cleaning up the framebuffers after the old framebuffer is no longer
947 * being displayed.
948 */
949
950/**
951 * drm_atomic_helper_prepare_planes - prepare plane resources after commit
952 * @dev: DRM device
953 * @state: atomic state object with old state structures
954 *
955 * This function prepares plane state, specifically framebuffers, for the new
956 * configuration. If any failure is encountered this function will call
957 * ->cleanup_fb on any already successfully prepared framebuffer.
958 *
959 * Returns:
960 * 0 on success, negative error code on failure.
961 */
962int drm_atomic_helper_prepare_planes(struct drm_device *dev,
963 struct drm_atomic_state *state)
964{
965 int nplanes = dev->mode_config.num_total_plane;
966 int ret, i;
967
968 for (i = 0; i < nplanes; i++) {
969 struct drm_plane_helper_funcs *funcs;
970 struct drm_plane *plane = state->planes[i];
971 struct drm_framebuffer *fb;
972
973 if (!plane)
974 continue;
975
976 funcs = plane->helper_private;
977
978 fb = state->plane_states[i]->fb;
979
980 if (fb && funcs->prepare_fb) {
981 ret = funcs->prepare_fb(plane, fb);
982 if (ret)
983 goto fail;
984 }
985 }
986
987 return 0;
988
989fail:
990 for (i--; i >= 0; i--) {
991 struct drm_plane_helper_funcs *funcs;
992 struct drm_plane *plane = state->planes[i];
993 struct drm_framebuffer *fb;
994
995 if (!plane)
996 continue;
997
998 funcs = plane->helper_private;
999
1000 fb = state->plane_states[i]->fb;
1001
1002 if (fb && funcs->cleanup_fb)
1003 funcs->cleanup_fb(plane, fb);
1004
1005 }
1006
1007 return ret;
1008}
1009EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1010
1011/**
1012 * drm_atomic_helper_commit_planes - commit plane state
1013 * @dev: DRM device
1014 * @old_state: atomic state object with old state structures
1015 *
1016 * This function commits the new plane state using the plane and atomic helper
1017 * functions for planes and crtcs. It assumes that the atomic state has already
1018 * been pushed into the relevant object state pointers, since this step can no
1019 * longer fail.
1020 *
1021 * It still requires the global state object @old_state to know which planes and
1022 * crtcs need to be updated though.
1023 */
1024void drm_atomic_helper_commit_planes(struct drm_device *dev,
1025 struct drm_atomic_state *old_state)
1026{
1027 int nplanes = dev->mode_config.num_total_plane;
1028 int ncrtcs = dev->mode_config.num_crtc;
1029 int i;
1030
1031 for (i = 0; i < ncrtcs; i++) {
1032 struct drm_crtc_helper_funcs *funcs;
1033 struct drm_crtc *crtc = old_state->crtcs[i];
1034
1035 if (!crtc)
1036 continue;
1037
1038 funcs = crtc->helper_private;
1039
1040 if (!funcs || !funcs->atomic_begin)
1041 continue;
1042
1043 funcs->atomic_begin(crtc);
1044 }
1045
1046 for (i = 0; i < nplanes; i++) {
1047 struct drm_plane_helper_funcs *funcs;
1048 struct drm_plane *plane = old_state->planes[i];
1049 struct drm_plane_state *old_plane_state;
1050
1051 if (!plane)
1052 continue;
1053
1054 funcs = plane->helper_private;
1055
1056 if (!funcs || !funcs->atomic_update)
1057 continue;
1058
1059 old_plane_state = old_state->plane_states[i];
1060
1061 funcs->atomic_update(plane, old_plane_state);
1062 }
1063
1064 for (i = 0; i < ncrtcs; i++) {
1065 struct drm_crtc_helper_funcs *funcs;
1066 struct drm_crtc *crtc = old_state->crtcs[i];
1067
1068 if (!crtc)
1069 continue;
1070
1071 funcs = crtc->helper_private;
1072
1073 if (!funcs || !funcs->atomic_flush)
1074 continue;
1075
1076 funcs->atomic_flush(crtc);
1077 }
1078}
1079EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1080
1081/**
1082 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1083 * @dev: DRM device
1084 * @old_state: atomic state object with old state structures
1085 *
1086 * This function cleans up plane state, specifically framebuffers, from the old
1087 * configuration. Hence the old configuration must be perserved in @old_state to
1088 * be able to call this function.
1089 *
1090 * This function must also be called on the new state when the atomic update
1091 * fails at any point after calling drm_atomic_helper_prepare_planes().
1092 */
1093void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1094 struct drm_atomic_state *old_state)
1095{
1096 int nplanes = dev->mode_config.num_total_plane;
1097 int i;
1098
1099 for (i = 0; i < nplanes; i++) {
1100 struct drm_plane_helper_funcs *funcs;
1101 struct drm_plane *plane = old_state->planes[i];
1102 struct drm_framebuffer *old_fb;
1103
1104 if (!plane)
1105 continue;
1106
1107 funcs = plane->helper_private;
1108
1109 old_fb = old_state->plane_states[i]->fb;
1110
1111 if (old_fb && funcs->cleanup_fb)
1112 funcs->cleanup_fb(plane, old_fb);
1113 }
1114}
1115EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1116
1117/**
1118 * drm_atomic_helper_swap_state - store atomic state into current sw state
1119 * @dev: DRM device
1120 * @state: atomic state
1121 *
1122 * This function stores the atomic state into the current state pointers in all
1123 * driver objects. It should be called after all failing steps have been done
1124 * and succeeded, but before the actual hardware state is committed.
1125 *
1126 * For cleanup and error recovery the current state for all changed objects will
1127 * be swaped into @state.
1128 *
1129 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1130 *
1131 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1132 *
1133 * 2. Do any other steps that might fail.
1134 *
1135 * 3. Put the staged state into the current state pointers with this function.
1136 *
1137 * 4. Actually commit the hardware state.
1138 *
1139 * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1140 * contains the old state. Also do any other cleanup required with that state.
1141 */
1142void drm_atomic_helper_swap_state(struct drm_device *dev,
1143 struct drm_atomic_state *state)
1144{
1145 int i;
1146
1147 for (i = 0; i < dev->mode_config.num_connector; i++) {
1148 struct drm_connector *connector = state->connectors[i];
1149
1150 if (!connector)
1151 continue;
1152
1153 connector->state->state = state;
1154 swap(state->connector_states[i], connector->state);
1155 connector->state->state = NULL;
1156 }
1157
1158 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1159 struct drm_crtc *crtc = state->crtcs[i];
1160
1161 if (!crtc)
1162 continue;
1163
1164 crtc->state->state = state;
1165 swap(state->crtc_states[i], crtc->state);
1166 crtc->state->state = NULL;
1167 }
1168
1169 for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1170 struct drm_plane *plane = state->planes[i];
1171
1172 if (!plane)
1173 continue;
1174
1175 plane->state->state = state;
1176 swap(state->plane_states[i], plane->state);
1177 plane->state->state = NULL;
1178 }
1179}
1180EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1181
1182/**
1183 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1184 * @plane: plane object to update
1185 * @crtc: owning CRTC of owning plane
1186 * @fb: framebuffer to flip onto plane
1187 * @crtc_x: x offset of primary plane on crtc
1188 * @crtc_y: y offset of primary plane on crtc
1189 * @crtc_w: width of primary plane rectangle on crtc
1190 * @crtc_h: height of primary plane rectangle on crtc
1191 * @src_x: x offset of @fb for panning
1192 * @src_y: y offset of @fb for panning
1193 * @src_w: width of source rectangle in @fb
1194 * @src_h: height of source rectangle in @fb
1195 *
1196 * Provides a default plane update handler using the atomic driver interface.
1197 *
1198 * RETURNS:
1199 * Zero on success, error code on failure
1200 */
1201int drm_atomic_helper_update_plane(struct drm_plane *plane,
1202 struct drm_crtc *crtc,
1203 struct drm_framebuffer *fb,
1204 int crtc_x, int crtc_y,
1205 unsigned int crtc_w, unsigned int crtc_h,
1206 uint32_t src_x, uint32_t src_y,
1207 uint32_t src_w, uint32_t src_h)
1208{
1209 struct drm_atomic_state *state;
1210 struct drm_plane_state *plane_state;
1211 int ret = 0;
1212
1213 state = drm_atomic_state_alloc(plane->dev);
1214 if (!state)
1215 return -ENOMEM;
1216
1217 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1218retry:
1219 plane_state = drm_atomic_get_plane_state(state, plane);
1220 if (IS_ERR(plane_state)) {
1221 ret = PTR_ERR(plane_state);
1222 goto fail;
1223 }
1224
1225 ret = drm_atomic_set_crtc_for_plane(state, plane, crtc);
1226 if (ret != 0)
1227 goto fail;
1228 drm_atomic_set_fb_for_plane(plane_state, fb);
1229 plane_state->crtc_x = crtc_x;
1230 plane_state->crtc_y = crtc_y;
1231 plane_state->crtc_h = crtc_h;
1232 plane_state->crtc_w = crtc_w;
1233 plane_state->src_x = src_x;
1234 plane_state->src_y = src_y;
1235 plane_state->src_h = src_h;
1236 plane_state->src_w = src_w;
1237
1238 ret = drm_atomic_commit(state);
1239 if (ret != 0)
1240 goto fail;
1241
1242 /* Driver takes ownership of state on successful commit. */
1243 return 0;
1244fail:
1245 if (ret == -EDEADLK)
1246 goto backoff;
1247
1248 drm_atomic_state_free(state);
1249
1250 return ret;
1251backoff:
1252 drm_atomic_state_clear(state);
1253 drm_atomic_legacy_backoff(state);
1254
1255 /*
1256 * Someone might have exchanged the framebuffer while we dropped locks
1257 * in the backoff code. We need to fix up the fb refcount tracking the
1258 * core does for us.
1259 */
1260 plane->old_fb = plane->fb;
1261
1262 goto retry;
1263}
1264EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1265
1266/**
1267 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1268 * @plane: plane to disable
1269 *
1270 * Provides a default plane disable handler using the atomic driver interface.
1271 *
1272 * RETURNS:
1273 * Zero on success, error code on failure
1274 */
1275int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1276{
1277 struct drm_atomic_state *state;
1278 struct drm_plane_state *plane_state;
1279 int ret = 0;
1280
1281 /*
1282 * FIXME: Without plane->crtc set we can't get at the implicit legacy
1283 * acquire context. The real fix will be to wire the acquire ctx through
1284 * everywhere we need it, but meanwhile prevent chaos by just skipping
1285 * this noop. The critical case is the cursor ioctls which a) only grab
1286 * crtc/cursor-plane locks (so we need the crtc to get at the right
1287 * acquire context) and b) can try to disable the plane multiple times.
1288 */
1289 if (!plane->crtc)
1290 return 0;
1291
1292 state = drm_atomic_state_alloc(plane->dev);
1293 if (!state)
1294 return -ENOMEM;
1295
1296 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1297retry:
1298 plane_state = drm_atomic_get_plane_state(state, plane);
1299 if (IS_ERR(plane_state)) {
1300 ret = PTR_ERR(plane_state);
1301 goto fail;
1302 }
1303
1304 ret = drm_atomic_set_crtc_for_plane(state, plane, NULL);
1305 if (ret != 0)
1306 goto fail;
1307 drm_atomic_set_fb_for_plane(plane_state, NULL);
1308 plane_state->crtc_x = 0;
1309 plane_state->crtc_y = 0;
1310 plane_state->crtc_h = 0;
1311 plane_state->crtc_w = 0;
1312 plane_state->src_x = 0;
1313 plane_state->src_y = 0;
1314 plane_state->src_h = 0;
1315 plane_state->src_w = 0;
1316
1317 ret = drm_atomic_commit(state);
1318 if (ret != 0)
1319 goto fail;
1320
1321 /* Driver takes ownership of state on successful commit. */
1322 return 0;
1323fail:
1324 if (ret == -EDEADLK)
1325 goto backoff;
1326
1327 drm_atomic_state_free(state);
1328
1329 return ret;
1330backoff:
1331 drm_atomic_state_clear(state);
1332 drm_atomic_legacy_backoff(state);
1333
1334 /*
1335 * Someone might have exchanged the framebuffer while we dropped locks
1336 * in the backoff code. We need to fix up the fb refcount tracking the
1337 * core does for us.
1338 */
1339 plane->old_fb = plane->fb;
1340
1341 goto retry;
1342}
1343EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1344
1345static int update_output_state(struct drm_atomic_state *state,
1346 struct drm_mode_set *set)
1347{
1348 struct drm_device *dev = set->crtc->dev;
1349 struct drm_connector_state *conn_state;
1350 int ncrtcs = state->dev->mode_config.num_crtc;
1351 int ret, i, j;
1352
1353 ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1354 state->acquire_ctx);
1355 if (ret)
1356 return ret;
1357
1358 /* First grab all affected connector/crtc states. */
1359 for (i = 0; i < set->num_connectors; i++) {
1360 conn_state = drm_atomic_get_connector_state(state,
1361 set->connectors[i]);
1362 if (IS_ERR(conn_state))
1363 return PTR_ERR(conn_state);
1364 }
1365
1366 for (i = 0; i < ncrtcs; i++) {
1367 struct drm_crtc *crtc = state->crtcs[i];
1368
1369 if (!crtc)
1370 continue;
1371
1372 ret = drm_atomic_add_affected_connectors(state, crtc);
1373 if (ret)
1374 return ret;
1375 }
1376
1377 /* Then recompute connector->crtc links and crtc enabling state. */
1378 for (i = 0; i < state->num_connector; i++) {
1379 struct drm_connector *connector;
1380
1381 connector = state->connectors[i];
1382 conn_state = state->connector_states[i];
1383
1384 if (!connector)
1385 continue;
1386
1387 if (conn_state->crtc == set->crtc) {
1388 ret = drm_atomic_set_crtc_for_connector(conn_state,
1389 NULL);
1390 if (ret)
1391 return ret;
1392 }
1393
1394 for (j = 0; j < set->num_connectors; j++) {
1395 if (set->connectors[j] == connector) {
1396 ret = drm_atomic_set_crtc_for_connector(conn_state,
1397 set->crtc);
1398 if (ret)
1399 return ret;
1400 break;
1401 }
1402 }
1403 }
1404
1405 for (i = 0; i < ncrtcs; i++) {
1406 struct drm_crtc *crtc = state->crtcs[i];
1407 struct drm_crtc_state *crtc_state = state->crtc_states[i];
1408
1409 if (!crtc)
1410 continue;
1411
1412 /* Don't update ->enable for the CRTC in the set_config request,
1413 * since a mismatch would indicate a bug in the upper layers.
1414 * The actual modeset code later on will catch any
1415 * inconsistencies here. */
1416 if (crtc == set->crtc)
1417 continue;
1418
1419 crtc_state->enable =
1420 drm_atomic_connectors_for_crtc(state, crtc);
1421 }
1422
1423 return 0;
1424}
1425
1426/**
1427 * drm_atomic_helper_set_config - set a new config from userspace
1428 * @set: mode set configuration
1429 *
1430 * Provides a default crtc set_config handler using the atomic driver interface.
1431 *
1432 * Returns:
1433 * Returns 0 on success, negative errno numbers on failure.
1434 */
1435int drm_atomic_helper_set_config(struct drm_mode_set *set)
1436{
1437 struct drm_atomic_state *state;
1438 struct drm_crtc *crtc = set->crtc;
1439 struct drm_crtc_state *crtc_state;
1440 struct drm_plane_state *primary_state;
1441 int ret = 0;
1442
1443 state = drm_atomic_state_alloc(crtc->dev);
1444 if (!state)
1445 return -ENOMEM;
1446
1447 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1448retry:
1449 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1450 if (IS_ERR(crtc_state)) {
1451 ret = PTR_ERR(crtc_state);
1452 goto fail;
1453 }
1454
1455 primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1456 if (IS_ERR(primary_state)) {
1457 ret = PTR_ERR(primary_state);
1458 goto fail;
1459 }
1460
1461 if (!set->mode) {
1462 WARN_ON(set->fb);
1463 WARN_ON(set->num_connectors);
1464
1465 crtc_state->enable = false;
1466
1467 ret = drm_atomic_set_crtc_for_plane(state, crtc->primary, NULL);
1468 if (ret != 0)
1469 goto fail;
1470
1471 drm_atomic_set_fb_for_plane(primary_state, NULL);
1472
1473 goto commit;
1474 }
1475
1476 WARN_ON(!set->fb);
1477 WARN_ON(!set->num_connectors);
1478
1479 crtc_state->enable = true;
1480 drm_mode_copy(&crtc_state->mode, set->mode);
1481
1482 ret = drm_atomic_set_crtc_for_plane(state, crtc->primary, crtc);
1483 if (ret != 0)
1484 goto fail;
1485 drm_atomic_set_fb_for_plane(primary_state, set->fb);
1486 primary_state->crtc_x = 0;
1487 primary_state->crtc_y = 0;
1488 primary_state->crtc_h = set->mode->vdisplay;
1489 primary_state->crtc_w = set->mode->hdisplay;
1490 primary_state->src_x = set->x << 16;
1491 primary_state->src_y = set->y << 16;
1492 primary_state->src_h = set->mode->vdisplay << 16;
1493 primary_state->src_w = set->mode->hdisplay << 16;
1494
1495commit:
1496 ret = update_output_state(state, set);
1497 if (ret)
1498 goto fail;
1499
1500 ret = drm_atomic_commit(state);
1501 if (ret != 0)
1502 goto fail;
1503
1504 /* Driver takes ownership of state on successful commit. */
1505 return 0;
1506fail:
1507 if (ret == -EDEADLK)
1508 goto backoff;
1509
1510 drm_atomic_state_free(state);
1511
1512 return ret;
1513backoff:
1514 drm_atomic_state_clear(state);
1515 drm_atomic_legacy_backoff(state);
1516
1517 /*
1518 * Someone might have exchanged the framebuffer while we dropped locks
1519 * in the backoff code. We need to fix up the fb refcount tracking the
1520 * core does for us.
1521 */
1522 crtc->primary->old_fb = crtc->primary->fb;
1523
1524 goto retry;
1525}
1526EXPORT_SYMBOL(drm_atomic_helper_set_config);
1527
1528/**
1529 * drm_atomic_helper_crtc_set_property - helper for crtc prorties
1530 * @crtc: DRM crtc
1531 * @property: DRM property
1532 * @val: value of property
1533 *
1534 * Provides a default plane disablle handler using the atomic driver interface.
1535 *
1536 * RETURNS:
1537 * Zero on success, error code on failure
1538 */
1539int
1540drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1541 struct drm_property *property,
1542 uint64_t val)
1543{
1544 struct drm_atomic_state *state;
1545 struct drm_crtc_state *crtc_state;
1546 int ret = 0;
1547
1548 state = drm_atomic_state_alloc(crtc->dev);
1549 if (!state)
1550 return -ENOMEM;
1551
1552 /* ->set_property is always called with all locks held. */
1553 state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1554retry:
1555 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1556 if (IS_ERR(crtc_state)) {
1557 ret = PTR_ERR(crtc_state);
1558 goto fail;
1559 }
1560
1561 ret = crtc->funcs->atomic_set_property(crtc, crtc_state,
1562 property, val);
1563 if (ret)
1564 goto fail;
1565
1566 ret = drm_atomic_commit(state);
1567 if (ret != 0)
1568 goto fail;
1569
1570 /* Driver takes ownership of state on successful commit. */
1571 return 0;
1572fail:
1573 if (ret == -EDEADLK)
1574 goto backoff;
1575
1576 drm_atomic_state_free(state);
1577
1578 return ret;
1579backoff:
1580 drm_atomic_state_clear(state);
1581 drm_atomic_legacy_backoff(state);
1582
1583 goto retry;
1584}
1585EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1586
1587/**
1588 * drm_atomic_helper_plane_set_property - helper for plane prorties
1589 * @plane: DRM plane
1590 * @property: DRM property
1591 * @val: value of property
1592 *
1593 * Provides a default plane disable handler using the atomic driver interface.
1594 *
1595 * RETURNS:
1596 * Zero on success, error code on failure
1597 */
1598int
1599drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1600 struct drm_property *property,
1601 uint64_t val)
1602{
1603 struct drm_atomic_state *state;
1604 struct drm_plane_state *plane_state;
1605 int ret = 0;
1606
1607 state = drm_atomic_state_alloc(plane->dev);
1608 if (!state)
1609 return -ENOMEM;
1610
1611 /* ->set_property is always called with all locks held. */
1612 state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1613retry:
1614 plane_state = drm_atomic_get_plane_state(state, plane);
1615 if (IS_ERR(plane_state)) {
1616 ret = PTR_ERR(plane_state);
1617 goto fail;
1618 }
1619
1620 ret = plane->funcs->atomic_set_property(plane, plane_state,
1621 property, val);
1622 if (ret)
1623 goto fail;
1624
1625 ret = drm_atomic_commit(state);
1626 if (ret != 0)
1627 goto fail;
1628
1629 /* Driver takes ownership of state on successful commit. */
1630 return 0;
1631fail:
1632 if (ret == -EDEADLK)
1633 goto backoff;
1634
1635 drm_atomic_state_free(state);
1636
1637 return ret;
1638backoff:
1639 drm_atomic_state_clear(state);
1640 drm_atomic_legacy_backoff(state);
1641
1642 goto retry;
1643}
1644EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1645
1646/**
1647 * drm_atomic_helper_connector_set_property - helper for connector prorties
1648 * @connector: DRM connector
1649 * @property: DRM property
1650 * @val: value of property
1651 *
1652 * Provides a default plane disablle handler using the atomic driver interface.
1653 *
1654 * RETURNS:
1655 * Zero on success, error code on failure
1656 */
1657int
1658drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1659 struct drm_property *property,
1660 uint64_t val)
1661{
1662 struct drm_atomic_state *state;
1663 struct drm_connector_state *connector_state;
1664 int ret = 0;
1665
1666 state = drm_atomic_state_alloc(connector->dev);
1667 if (!state)
1668 return -ENOMEM;
1669
1670 /* ->set_property is always called with all locks held. */
1671 state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1672retry:
1673 connector_state = drm_atomic_get_connector_state(state, connector);
1674 if (IS_ERR(connector_state)) {
1675 ret = PTR_ERR(connector_state);
1676 goto fail;
1677 }
1678
1679 ret = connector->funcs->atomic_set_property(connector, connector_state,
1680 property, val);
1681 if (ret)
1682 goto fail;
1683
1684 ret = drm_atomic_commit(state);
1685 if (ret != 0)
1686 goto fail;
1687
1688 /* Driver takes ownership of state on successful commit. */
1689 return 0;
1690fail:
1691 if (ret == -EDEADLK)
1692 goto backoff;
1693
1694 drm_atomic_state_free(state);
1695
1696 return ret;
1697backoff:
1698 drm_atomic_state_clear(state);
1699 drm_atomic_legacy_backoff(state);
1700
1701 goto retry;
1702}
1703EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
1704
1705/**
1706 * drm_atomic_helper_page_flip - execute a legacy page flip
1707 * @crtc: DRM crtc
1708 * @fb: DRM framebuffer
1709 * @event: optional DRM event to signal upon completion
1710 * @flags: flip flags for non-vblank sync'ed updates
1711 *
1712 * Provides a default page flip implementation using the atomic driver interface.
1713 *
1714 * Note that for now so called async page flips (i.e. updates which are not
1715 * synchronized to vblank) are not supported, since the atomic interfaces have
1716 * no provisions for this yet.
1717 *
1718 * Returns:
1719 * Returns 0 on success, negative errno numbers on failure.
1720 */
1721int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
1722 struct drm_framebuffer *fb,
1723 struct drm_pending_vblank_event *event,
1724 uint32_t flags)
1725{
1726 struct drm_plane *plane = crtc->primary;
1727 struct drm_atomic_state *state;
1728 struct drm_plane_state *plane_state;
1729 struct drm_crtc_state *crtc_state;
1730 int ret = 0;
1731
1732 if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
1733 return -EINVAL;
1734
1735 state = drm_atomic_state_alloc(plane->dev);
1736 if (!state)
1737 return -ENOMEM;
1738
1739 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1740retry:
1741 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1742 if (IS_ERR(crtc_state)) {
1743 ret = PTR_ERR(crtc_state);
1744 goto fail;
1745 }
1746 crtc_state->event = event;
1747
1748 plane_state = drm_atomic_get_plane_state(state, plane);
1749 if (IS_ERR(plane_state)) {
1750 ret = PTR_ERR(plane_state);
1751 goto fail;
1752 }
1753
1754 ret = drm_atomic_set_crtc_for_plane(state, plane, crtc);
1755 if (ret != 0)
1756 goto fail;
1757 drm_atomic_set_fb_for_plane(plane_state, fb);
1758
1759 ret = drm_atomic_async_commit(state);
1760 if (ret != 0)
1761 goto fail;
1762
1763 /* TODO: ->page_flip is the only driver callback where the core
1764 * doesn't update plane->fb. For now patch it up here. */
1765 plane->fb = plane->state->fb;
1766
1767 /* Driver takes ownership of state on successful async commit. */
1768 return 0;
1769fail:
1770 if (ret == -EDEADLK)
1771 goto backoff;
1772
1773 drm_atomic_state_free(state);
1774
1775 return ret;
1776backoff:
1777 drm_atomic_state_clear(state);
1778 drm_atomic_legacy_backoff(state);
1779
1780 /*
1781 * Someone might have exchanged the framebuffer while we dropped locks
1782 * in the backoff code. We need to fix up the fb refcount tracking the
1783 * core does for us.
1784 */
1785 plane->old_fb = plane->fb;
1786
1787 goto retry;
1788}
1789EXPORT_SYMBOL(drm_atomic_helper_page_flip);
1790
1791/**
1792 * DOC: atomic state reset and initialization
1793 *
1794 * Both the drm core and the atomic helpers assume that there is always the full
1795 * and correct atomic software state for all connectors, CRTCs and planes
1796 * available. Which is a bit a problem on driver load and also after system
1797 * suspend. One way to solve this is to have a hardware state read-out
1798 * infrastructure which reconstructs the full software state (e.g. the i915
1799 * driver).
1800 *
1801 * The simpler solution is to just reset the software state to everything off,
1802 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
1803 * the atomic helpers provide default reset implementations for all hooks.
1804 */
1805
1806/**
1807 * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
1808 * @crtc: drm CRTC
1809 *
1810 * Resets the atomic state for @crtc by freeing the state pointer (which might
1811 * be NULL, e.g. at driver load time) and allocating a new empty state object.
1812 */
1813void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
1814{
1815 kfree(crtc->state);
1816 crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
1817}
1818EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
1819
1820/**
1821 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
1822 * @crtc: drm CRTC
1823 *
1824 * Default CRTC state duplicate hook for drivers which don't have their own
1825 * subclassed CRTC state structure.
1826 */
1827struct drm_crtc_state *
1828drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
1829{
1830 struct drm_crtc_state *state;
1831
1832 if (WARN_ON(!crtc->state))
1833 return NULL;
1834
1835 state = kmemdup(crtc->state, sizeof(*crtc->state), GFP_KERNEL);
1836
1837 if (state) {
1838 state->mode_changed = false;
1839 state->planes_changed = false;
1840 state->event = NULL;
1841 }
1842
1843 return state;
1844}
1845EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
1846
1847/**
1848 * drm_atomic_helper_crtc_destroy_state - default state destroy hook
1849 * @crtc: drm CRTC
1850 * @state: CRTC state object to release
1851 *
1852 * Default CRTC state destroy hook for drivers which don't have their own
1853 * subclassed CRTC state structure.
1854 */
1855void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
1856 struct drm_crtc_state *state)
1857{
1858 kfree(state);
1859}
1860EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
1861
1862/**
1863 * drm_atomic_helper_plane_reset - default ->reset hook for planes
1864 * @plane: drm plane
1865 *
1866 * Resets the atomic state for @plane by freeing the state pointer (which might
1867 * be NULL, e.g. at driver load time) and allocating a new empty state object.
1868 */
1869void drm_atomic_helper_plane_reset(struct drm_plane *plane)
1870{
1871 if (plane->state && plane->state->fb)
1872 drm_framebuffer_unreference(plane->state->fb);
1873
1874 kfree(plane->state);
1875 plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
1876}
1877EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
1878
1879/**
1880 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
1881 * @plane: drm plane
1882 *
1883 * Default plane state duplicate hook for drivers which don't have their own
1884 * subclassed plane state structure.
1885 */
1886struct drm_plane_state *
1887drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
1888{
1889 struct drm_plane_state *state;
1890
1891 if (WARN_ON(!plane->state))
1892 return NULL;
1893
1894 state = kmemdup(plane->state, sizeof(*plane->state), GFP_KERNEL);
1895
1896 if (state && state->fb)
1897 drm_framebuffer_reference(state->fb);
1898
1899 return state;
1900}
1901EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
1902
1903/**
1904 * drm_atomic_helper_plane_destroy_state - default state destroy hook
1905 * @plane: drm plane
1906 * @state: plane state object to release
1907 *
1908 * Default plane state destroy hook for drivers which don't have their own
1909 * subclassed plane state structure.
1910 */
1911void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
1912 struct drm_plane_state *state)
1913{
1914 if (state->fb)
1915 drm_framebuffer_unreference(state->fb);
1916
1917 kfree(state);
1918}
1919EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
1920
1921/**
1922 * drm_atomic_helper_connector_reset - default ->reset hook for connectors
1923 * @connector: drm connector
1924 *
1925 * Resets the atomic state for @connector by freeing the state pointer (which
1926 * might be NULL, e.g. at driver load time) and allocating a new empty state
1927 * object.
1928 */
1929void drm_atomic_helper_connector_reset(struct drm_connector *connector)
1930{
1931 kfree(connector->state);
1932 connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
1933}
1934EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
1935
1936/**
1937 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
1938 * @connector: drm connector
1939 *
1940 * Default connector state duplicate hook for drivers which don't have their own
1941 * subclassed connector state structure.
1942 */
1943struct drm_connector_state *
1944drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
1945{
1946 if (WARN_ON(!connector->state))
1947 return NULL;
1948
1949 return kmemdup(connector->state, sizeof(*connector->state), GFP_KERNEL);
1950}
1951EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
1952
1953/**
1954 * drm_atomic_helper_connector_destroy_state - default state destroy hook
1955 * @connector: drm connector
1956 * @state: connector state object to release
1957 *
1958 * Default connector state destroy hook for drivers which don't have their own
1959 * subclassed connector state structure.
1960 */
1961void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
1962 struct drm_connector_state *state)
1963{
1964 kfree(state);
1965}
1966EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-03 03:37:58 -0500