2 * Copyright (C) 2014 Red Hat
3 * Copyright (C) 2014 Intel Corp.
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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.
24 * Rob Clark <robdclark@gmail.com>
25 * Daniel Vetter <daniel.vetter@ffwll.ch>
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>
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.
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.
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.
57 drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
58 struct drm_plane_state *plane_state,
59 struct drm_plane *plane)
61 struct drm_crtc_state *crtc_state;
63 if (plane->state->crtc) {
64 crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)];
66 if (WARN_ON(!crtc_state))
69 crtc_state->planes_changed = true;
72 if (plane_state->crtc) {
74 state->crtc_states[drm_crtc_index(plane_state->crtc)];
76 if (WARN_ON(!crtc_state))
79 crtc_state->planes_changed = true;
83 static struct drm_crtc *
84 get_current_crtc_for_encoder(struct drm_device *dev,
85 struct drm_encoder *encoder)
87 struct drm_mode_config *config = &dev->mode_config;
88 struct drm_connector *connector;
90 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
92 list_for_each_entry(connector, &config->connector_list, head) {
93 if (connector->state->best_encoder != encoder)
96 return connector->state->crtc;
103 steal_encoder(struct drm_atomic_state *state,
104 struct drm_encoder *encoder,
105 struct drm_crtc *encoder_crtc)
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;
114 * We can only steal an encoder coming from a connector, which means we
115 * must already hold the connection_mutex.
117 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
119 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d], stealing it\n",
120 encoder->base.id, encoder->name,
121 encoder_crtc->base.id);
123 crtc_state = drm_atomic_get_crtc_state(state, encoder_crtc);
124 if (IS_ERR(crtc_state))
125 return PTR_ERR(crtc_state);
127 crtc_state->mode_changed = true;
129 list_for_each_entry(connector, &config->connector_list, head) {
130 if (connector->state->best_encoder != encoder)
133 DRM_DEBUG_ATOMIC("Stealing encoder from [CONNECTOR:%d:%s]\n",
137 connector_state = drm_atomic_get_connector_state(state,
139 if (IS_ERR(connector_state))
140 return PTR_ERR(connector_state);
142 ret = drm_atomic_set_crtc_for_connector(connector_state, NULL);
145 connector_state->best_encoder = NULL;
152 update_connector_routing(struct drm_atomic_state *state, int conn_idx)
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;
162 connector = state->connectors[conn_idx];
163 connector_state = state->connector_states[conn_idx];
168 DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n",
172 if (connector->state->crtc != connector_state->crtc) {
173 if (connector->state->crtc) {
174 idx = drm_crtc_index(connector->state->crtc);
176 crtc_state = state->crtc_states[idx];
177 crtc_state->mode_changed = true;
180 if (connector_state->crtc) {
181 idx = drm_crtc_index(connector_state->crtc);
183 crtc_state = state->crtc_states[idx];
184 crtc_state->mode_changed = true;
188 if (!connector_state->crtc) {
189 DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n",
193 connector_state->best_encoder = NULL;
198 funcs = connector->helper_private;
199 new_encoder = funcs->best_encoder(connector);
202 DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
208 if (new_encoder == connector_state->best_encoder) {
209 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
212 new_encoder->base.id,
214 connector_state->crtc->base.id);
219 encoder_crtc = get_current_crtc_for_encoder(state->dev,
223 ret = steal_encoder(state, new_encoder, encoder_crtc);
225 DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
232 connector_state->best_encoder = new_encoder;
233 idx = drm_crtc_index(connector_state->crtc);
235 crtc_state = state->crtc_states[idx];
236 crtc_state->mode_changed = true;
238 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
241 new_encoder->base.id,
243 connector_state->crtc->base.id);
249 mode_fixup(struct drm_atomic_state *state)
251 int ncrtcs = state->dev->mode_config.num_crtc;
252 struct drm_crtc_state *crtc_state;
253 struct drm_connector_state *conn_state;
257 for (i = 0; i < ncrtcs; i++) {
258 crtc_state = state->crtc_states[i];
260 if (!crtc_state || !crtc_state->mode_changed)
263 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
266 for (i = 0; i < state->num_connector; i++) {
267 struct drm_encoder_helper_funcs *funcs;
268 struct drm_encoder *encoder;
270 conn_state = state->connector_states[i];
275 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
277 if (!conn_state->crtc || !conn_state->best_encoder)
281 state->crtc_states[drm_crtc_index(conn_state->crtc)];
284 * Each encoder has at most one connector (since we always steal
285 * it away), so we won't call ->mode_fixup twice.
287 encoder = conn_state->best_encoder;
288 funcs = encoder->helper_private;
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);
295 DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
300 if (funcs->atomic_check) {
301 ret = funcs->atomic_check(encoder, crtc_state,
304 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
305 encoder->base.id, encoder->name);
309 ret = funcs->mode_fixup(encoder, &crtc_state->mode,
310 &crtc_state->adjusted_mode);
312 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
313 encoder->base.id, encoder->name);
319 for (i = 0; i < ncrtcs; i++) {
320 struct drm_crtc_helper_funcs *funcs;
321 struct drm_crtc *crtc;
323 crtc_state = state->crtc_states[i];
324 crtc = state->crtcs[i];
326 if (!crtc_state || !crtc_state->mode_changed)
329 funcs = crtc->helper_private;
330 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
331 &crtc_state->adjusted_mode);
333 DRM_DEBUG_ATOMIC("[CRTC:%d] fixup failed\n",
343 needs_modeset(struct drm_crtc_state *state)
345 return state->mode_changed || state->active_changed;
349 * drm_atomic_helper_check - validate state object for modeset changes
351 * @state: the driver state object
353 * Check the state object to see if the requested state is physically possible.
354 * This does all the crtc and connector related computations for an atomic
355 * update. It computes and updates crtc_state->mode_changed, adds any additional
356 * connectors needed for full modesets and calls down into ->mode_fixup
357 * functions of the driver backend.
361 * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
362 * plane update can't be done without a full modeset) _must_ call this function
363 * afterwards after that change. It is permitted to call this function multiple
364 * times for the same update, e.g. when the ->atomic_check functions depend upon
365 * the adjusted dotclock for fifo space allocation and watermark computation.
368 * Zero for success or -errno
371 drm_atomic_helper_check_modeset(struct drm_device *dev,
372 struct drm_atomic_state *state)
374 int ncrtcs = dev->mode_config.num_crtc;
375 struct drm_crtc *crtc;
376 struct drm_crtc_state *crtc_state;
379 for (i = 0; i < ncrtcs; i++) {
380 crtc = state->crtcs[i];
381 crtc_state = state->crtc_states[i];
386 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
387 DRM_DEBUG_ATOMIC("[CRTC:%d] mode changed\n",
389 crtc_state->mode_changed = true;
392 if (crtc->state->enable != crtc_state->enable) {
393 DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
395 crtc_state->mode_changed = true;
399 for (i = 0; i < state->num_connector; i++) {
401 * This only sets crtc->mode_changed for routing changes,
402 * drivers must set crtc->mode_changed themselves when connector
403 * properties need to be updated.
405 ret = update_connector_routing(state, i);
411 * After all the routing has been prepared we need to add in any
412 * connector which is itself unchanged, but who's crtc changes it's
413 * configuration. This must be done before calling mode_fixup in case a
414 * crtc only changed its mode but has the same set of connectors.
416 for (i = 0; i < ncrtcs; i++) {
419 crtc = state->crtcs[i];
420 crtc_state = state->crtc_states[i];
426 * We must set ->active_changed after walking connectors for
427 * otherwise an update that only changes active would result in
428 * a full modeset because update_connector_routing force that.
430 if (crtc->state->active != crtc_state->active) {
431 DRM_DEBUG_ATOMIC("[CRTC:%d] active changed\n",
433 crtc_state->active_changed = true;
436 if (!needs_modeset(crtc_state))
439 DRM_DEBUG_ATOMIC("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
441 crtc_state->enable ? 'y' : 'n',
442 crtc_state->active ? 'y' : 'n');
444 ret = drm_atomic_add_affected_connectors(state, crtc);
448 num_connectors = drm_atomic_connectors_for_crtc(state,
451 if (crtc_state->enable != !!num_connectors) {
452 DRM_DEBUG_ATOMIC("[CRTC:%d] enabled/connectors mismatch\n",
459 return mode_fixup(state);
461 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
464 * drm_atomic_helper_check - validate state object for modeset changes
466 * @state: the driver state object
468 * Check the state object to see if the requested state is physically possible.
469 * This does all the plane update related checks using by calling into the
470 * ->atomic_check hooks provided by the driver.
473 * Zero for success or -errno
476 drm_atomic_helper_check_planes(struct drm_device *dev,
477 struct drm_atomic_state *state)
479 int nplanes = dev->mode_config.num_total_plane;
480 int ncrtcs = dev->mode_config.num_crtc;
483 for (i = 0; i < nplanes; i++) {
484 struct drm_plane_helper_funcs *funcs;
485 struct drm_plane *plane = state->planes[i];
486 struct drm_plane_state *plane_state = state->plane_states[i];
491 funcs = plane->helper_private;
493 drm_atomic_helper_plane_changed(state, plane_state, plane);
495 if (!funcs || !funcs->atomic_check)
498 ret = funcs->atomic_check(plane, plane_state);
500 DRM_DEBUG_ATOMIC("[PLANE:%d] atomic driver check failed\n",
506 for (i = 0; i < ncrtcs; i++) {
507 struct drm_crtc_helper_funcs *funcs;
508 struct drm_crtc *crtc = state->crtcs[i];
513 funcs = crtc->helper_private;
515 if (!funcs || !funcs->atomic_check)
518 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
520 DRM_DEBUG_ATOMIC("[CRTC:%d] atomic driver check failed\n",
528 EXPORT_SYMBOL(drm_atomic_helper_check_planes);
531 * drm_atomic_helper_check - validate state object
533 * @state: the driver state object
535 * Check the state object to see if the requested state is physically possible.
536 * Only crtcs and planes have check callbacks, so for any additional (global)
537 * checking that a driver needs it can simply wrap that around this function.
538 * Drivers without such needs can directly use this as their ->atomic_check()
541 * This just wraps the two parts of the state checking for planes and modeset
542 * state in the default order: First it calls drm_atomic_helper_check_modeset()
543 * and then drm_atomic_helper_check_planes(). The assumption is that the
544 * ->atomic_check functions depend upon an updated adjusted_mode.clock to
545 * e.g. properly compute watermarks.
548 * Zero for success or -errno
550 int drm_atomic_helper_check(struct drm_device *dev,
551 struct drm_atomic_state *state)
555 ret = drm_atomic_helper_check_modeset(dev, state);
559 ret = drm_atomic_helper_check_planes(dev, state);
565 EXPORT_SYMBOL(drm_atomic_helper_check);
568 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
570 int ncrtcs = old_state->dev->mode_config.num_crtc;
573 for (i = 0; i < old_state->num_connector; i++) {
574 struct drm_connector_state *old_conn_state;
575 struct drm_connector *connector;
576 struct drm_encoder_helper_funcs *funcs;
577 struct drm_encoder *encoder;
578 struct drm_crtc_state *old_crtc_state;
580 old_conn_state = old_state->connector_states[i];
581 connector = old_state->connectors[i];
583 /* Shut down everything that's in the changeset and currently
584 * still on. So need to check the old, saved state. */
585 if (!old_conn_state || !old_conn_state->crtc)
588 old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
590 if (!old_crtc_state->active)
593 encoder = old_conn_state->best_encoder;
595 /* We shouldn't get this far if we didn't previously have
596 * an encoder.. but WARN_ON() rather than explode.
598 if (WARN_ON(!encoder))
601 funcs = encoder->helper_private;
603 DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
604 encoder->base.id, encoder->name);
607 * Each encoder has at most one connector (since we always steal
608 * it away), so we won't call call disable hooks twice.
611 encoder->bridge->funcs->disable(encoder->bridge);
613 /* Right function depends upon target state. */
614 if (connector->state->crtc && funcs->prepare)
615 funcs->prepare(encoder);
616 else if (funcs->disable)
617 funcs->disable(encoder);
619 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
622 encoder->bridge->funcs->post_disable(encoder->bridge);
625 for (i = 0; i < ncrtcs; i++) {
626 struct drm_crtc_helper_funcs *funcs;
627 struct drm_crtc *crtc;
628 struct drm_crtc_state *old_crtc_state;
630 crtc = old_state->crtcs[i];
631 old_crtc_state = old_state->crtc_states[i];
633 /* Shut down everything that needs a full modeset. */
634 if (!crtc || !needs_modeset(crtc->state))
637 if (!old_crtc_state->active)
640 funcs = crtc->helper_private;
642 DRM_DEBUG_ATOMIC("disabling [CRTC:%d]\n",
646 /* Right function depends upon target state. */
647 if (crtc->state->enable && funcs->prepare)
648 funcs->prepare(crtc);
649 else if (funcs->disable)
650 funcs->disable(crtc);
652 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
657 set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
659 int ncrtcs = old_state->dev->mode_config.num_crtc;
662 /* clear out existing links */
663 for (i = 0; i < old_state->num_connector; i++) {
664 struct drm_connector *connector;
666 connector = old_state->connectors[i];
668 if (!connector || !connector->encoder)
671 WARN_ON(!connector->encoder->crtc);
673 connector->encoder->crtc = NULL;
674 connector->encoder = NULL;
678 for (i = 0; i < old_state->num_connector; i++) {
679 struct drm_connector *connector;
681 connector = old_state->connectors[i];
683 if (!connector || !connector->state->crtc)
686 if (WARN_ON(!connector->state->best_encoder))
689 connector->encoder = connector->state->best_encoder;
690 connector->encoder->crtc = connector->state->crtc;
693 /* set legacy state in the crtc structure */
694 for (i = 0; i < ncrtcs; i++) {
695 struct drm_crtc *crtc;
697 crtc = old_state->crtcs[i];
702 crtc->mode = crtc->state->mode;
703 crtc->enabled = crtc->state->enable;
704 crtc->x = crtc->primary->state->src_x >> 16;
705 crtc->y = crtc->primary->state->src_y >> 16;
710 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
712 int ncrtcs = old_state->dev->mode_config.num_crtc;
715 for (i = 0; i < ncrtcs; i++) {
716 struct drm_crtc_helper_funcs *funcs;
717 struct drm_crtc *crtc;
719 crtc = old_state->crtcs[i];
721 if (!crtc || !crtc->state->mode_changed)
724 funcs = crtc->helper_private;
726 if (crtc->state->enable && funcs->mode_set_nofb) {
727 DRM_DEBUG_ATOMIC("modeset on [CRTC:%d]\n",
730 funcs->mode_set_nofb(crtc);
734 for (i = 0; i < old_state->num_connector; i++) {
735 struct drm_connector *connector;
736 struct drm_crtc_state *new_crtc_state;
737 struct drm_encoder_helper_funcs *funcs;
738 struct drm_encoder *encoder;
739 struct drm_display_mode *mode, *adjusted_mode;
741 connector = old_state->connectors[i];
743 if (!connector || !connector->state->best_encoder)
746 encoder = connector->state->best_encoder;
747 funcs = encoder->helper_private;
748 new_crtc_state = connector->state->crtc->state;
749 mode = &new_crtc_state->mode;
750 adjusted_mode = &new_crtc_state->adjusted_mode;
752 if (!new_crtc_state->mode_changed)
755 DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
756 encoder->base.id, encoder->name);
759 * Each encoder has at most one connector (since we always steal
760 * it away), so we won't call call mode_set hooks twice.
763 funcs->mode_set(encoder, mode, adjusted_mode);
765 if (encoder->bridge && encoder->bridge->funcs->mode_set)
766 encoder->bridge->funcs->mode_set(encoder->bridge,
767 mode, adjusted_mode);
772 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
774 * @old_state: atomic state object with old state structures
776 * This function shuts down all the outputs that need to be shut down and
777 * prepares them (if required) with the new mode.
779 * For compatability with legacy crtc helpers this should be called before
780 * drm_atomic_helper_commit_planes(), which is what the default commit function
781 * does. But drivers with different needs can group the modeset commits together
782 * and do the plane commits at the end. This is useful for drivers doing runtime
783 * PM since planes updates then only happen when the CRTC is actually enabled.
785 void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
786 struct drm_atomic_state *old_state)
788 disable_outputs(dev, old_state);
789 set_routing_links(dev, old_state);
790 crtc_set_mode(dev, old_state);
792 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
795 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
797 * @old_state: atomic state object with old state structures
799 * This function enables all the outputs with the new configuration which had to
800 * be turned off for the update.
802 * For compatability with legacy crtc helpers this should be called after
803 * drm_atomic_helper_commit_planes(), which is what the default commit function
804 * does. But drivers with different needs can group the modeset commits together
805 * and do the plane commits at the end. This is useful for drivers doing runtime
806 * PM since planes updates then only happen when the CRTC is actually enabled.
808 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
809 struct drm_atomic_state *old_state)
811 int ncrtcs = old_state->dev->mode_config.num_crtc;
814 for (i = 0; i < ncrtcs; i++) {
815 struct drm_crtc_helper_funcs *funcs;
816 struct drm_crtc *crtc;
818 crtc = old_state->crtcs[i];
820 /* Need to filter out CRTCs where only planes change. */
821 if (!crtc || !needs_modeset(crtc->state))
824 if (!crtc->state->active)
827 funcs = crtc->helper_private;
829 if (crtc->state->enable) {
830 DRM_DEBUG_ATOMIC("enabling [CRTC:%d]\n",
840 for (i = 0; i < old_state->num_connector; i++) {
841 struct drm_connector *connector;
842 struct drm_encoder_helper_funcs *funcs;
843 struct drm_encoder *encoder;
845 connector = old_state->connectors[i];
847 if (!connector || !connector->state->best_encoder)
850 if (!connector->state->crtc->state->active)
853 encoder = connector->state->best_encoder;
854 funcs = encoder->helper_private;
856 DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
857 encoder->base.id, encoder->name);
860 * Each encoder has at most one connector (since we always steal
861 * it away), so we won't call call enable hooks twice.
864 encoder->bridge->funcs->pre_enable(encoder->bridge);
867 funcs->enable(encoder);
869 funcs->commit(encoder);
872 encoder->bridge->funcs->enable(encoder->bridge);
875 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
877 static void wait_for_fences(struct drm_device *dev,
878 struct drm_atomic_state *state)
880 int nplanes = dev->mode_config.num_total_plane;
883 for (i = 0; i < nplanes; i++) {
884 struct drm_plane *plane = state->planes[i];
886 if (!plane || !plane->state->fence)
889 WARN_ON(!plane->state->fb);
891 fence_wait(plane->state->fence, false);
892 fence_put(plane->state->fence);
893 plane->state->fence = NULL;
897 static bool framebuffer_changed(struct drm_device *dev,
898 struct drm_atomic_state *old_state,
899 struct drm_crtc *crtc)
901 struct drm_plane *plane;
902 struct drm_plane_state *old_plane_state;
903 int nplanes = old_state->dev->mode_config.num_total_plane;
906 for (i = 0; i < nplanes; i++) {
907 plane = old_state->planes[i];
908 old_plane_state = old_state->plane_states[i];
913 if (plane->state->crtc != crtc &&
914 old_plane_state->crtc != crtc)
917 if (plane->state->fb != old_plane_state->fb)
925 * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
927 * @old_state: atomic state object with old state structures
929 * Helper to, after atomic commit, wait for vblanks on all effected
930 * crtcs (ie. before cleaning up old framebuffers using
931 * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
932 * framebuffers have actually changed to optimize for the legacy cursor and
933 * plane update use-case.
936 drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
937 struct drm_atomic_state *old_state)
939 struct drm_crtc *crtc;
940 struct drm_crtc_state *old_crtc_state;
941 int ncrtcs = old_state->dev->mode_config.num_crtc;
944 for (i = 0; i < ncrtcs; i++) {
945 crtc = old_state->crtcs[i];
946 old_crtc_state = old_state->crtc_states[i];
951 /* No one cares about the old state, so abuse it for tracking
952 * and store whether we hold a vblank reference (and should do a
953 * vblank wait) in the ->enable boolean. */
954 old_crtc_state->enable = false;
956 if (!crtc->state->enable)
959 /* Legacy cursor ioctls are completely unsynced, and userspace
960 * relies on that (by doing tons of cursor updates). */
961 if (old_state->legacy_cursor_update)
964 if (!framebuffer_changed(dev, old_state, crtc))
967 ret = drm_crtc_vblank_get(crtc);
971 old_crtc_state->enable = true;
972 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
975 for (i = 0; i < ncrtcs; i++) {
976 crtc = old_state->crtcs[i];
977 old_crtc_state = old_state->crtc_states[i];
979 if (!crtc || !old_crtc_state->enable)
982 ret = wait_event_timeout(dev->vblank[i].queue,
983 old_crtc_state->last_vblank_count !=
984 drm_vblank_count(dev, i),
985 msecs_to_jiffies(50));
987 drm_crtc_vblank_put(crtc);
990 EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
993 * drm_atomic_helper_commit - commit validated state object
995 * @state: the driver state object
996 * @async: asynchronous commit
998 * This function commits a with drm_atomic_helper_check() pre-validated state
999 * object. This can still fail when e.g. the framebuffer reservation fails. For
1000 * now this doesn't implement asynchronous commits.
1003 * Zero for success or -errno.
1005 int drm_atomic_helper_commit(struct drm_device *dev,
1006 struct drm_atomic_state *state,
1014 ret = drm_atomic_helper_prepare_planes(dev, state);
1019 * This is the point of no return - everything below never fails except
1020 * when the hw goes bonghits. Which means we can commit the new state on
1021 * the software side now.
1024 drm_atomic_helper_swap_state(dev, state);
1027 * Everything below can be run asynchronously without the need to grab
1028 * any modeset locks at all under one conditions: It must be guaranteed
1029 * that the asynchronous work has either been cancelled (if the driver
1030 * supports it, which at least requires that the framebuffers get
1031 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
1032 * before the new state gets committed on the software side with
1033 * drm_atomic_helper_swap_state().
1035 * This scheme allows new atomic state updates to be prepared and
1036 * checked in parallel to the asynchronous completion of the previous
1037 * update. Which is important since compositors need to figure out the
1038 * composition of the next frame right after having submitted the
1042 wait_for_fences(dev, state);
1044 drm_atomic_helper_commit_modeset_disables(dev, state);
1046 drm_atomic_helper_commit_planes(dev, state);
1048 drm_atomic_helper_commit_modeset_enables(dev, state);
1050 drm_atomic_helper_wait_for_vblanks(dev, state);
1052 drm_atomic_helper_cleanup_planes(dev, state);
1054 drm_atomic_state_free(state);
1058 EXPORT_SYMBOL(drm_atomic_helper_commit);
1061 * DOC: implementing async commit
1063 * For now the atomic helpers don't support async commit directly. If there is
1064 * real need it could be added though, using the dma-buf fence infrastructure
1065 * for generic synchronization with outstanding rendering.
1067 * For now drivers have to implement async commit themselves, with the following
1068 * sequence being the recommended one:
1070 * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
1071 * which commit needs to call which can fail, so we want to run it first and
1074 * 2. Synchronize with any outstanding asynchronous commit worker threads which
1075 * might be affected the new state update. This can be done by either cancelling
1076 * or flushing the work items, depending upon whether the driver can deal with
1077 * cancelled updates. Note that it is important to ensure that the framebuffer
1078 * cleanup is still done when cancelling.
1080 * For sufficient parallelism it is recommended to have a work item per crtc
1081 * (for updates which don't touch global state) and a global one. Then we only
1082 * need to synchronize with the crtc work items for changed crtcs and the global
1083 * work item, which allows nice concurrent updates on disjoint sets of crtcs.
1085 * 3. The software state is updated synchronously with
1086 * drm_atomic_helper_swap_state. Doing this under the protection of all modeset
1087 * locks means concurrent callers never see inconsistent state. And doing this
1088 * while it's guaranteed that no relevant async worker runs means that async
1089 * workers do not need grab any locks. Actually they must not grab locks, for
1090 * otherwise the work flushing will deadlock.
1092 * 4. Schedule a work item to do all subsequent steps, using the split-out
1093 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1094 * then cleaning up the framebuffers after the old framebuffer is no longer
1099 * drm_atomic_helper_prepare_planes - prepare plane resources after commit
1101 * @state: atomic state object with old state structures
1103 * This function prepares plane state, specifically framebuffers, for the new
1104 * configuration. If any failure is encountered this function will call
1105 * ->cleanup_fb on any already successfully prepared framebuffer.
1108 * 0 on success, negative error code on failure.
1110 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
1111 struct drm_atomic_state *state)
1113 int nplanes = dev->mode_config.num_total_plane;
1116 for (i = 0; i < nplanes; i++) {
1117 struct drm_plane_helper_funcs *funcs;
1118 struct drm_plane *plane = state->planes[i];
1119 struct drm_framebuffer *fb;
1124 funcs = plane->helper_private;
1126 fb = state->plane_states[i]->fb;
1128 if (fb && funcs->prepare_fb) {
1129 ret = funcs->prepare_fb(plane, fb);
1138 for (i--; i >= 0; i--) {
1139 struct drm_plane_helper_funcs *funcs;
1140 struct drm_plane *plane = state->planes[i];
1141 struct drm_framebuffer *fb;
1146 funcs = plane->helper_private;
1148 fb = state->plane_states[i]->fb;
1150 if (fb && funcs->cleanup_fb)
1151 funcs->cleanup_fb(plane, fb);
1157 EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1160 * drm_atomic_helper_commit_planes - commit plane state
1162 * @old_state: atomic state object with old state structures
1164 * This function commits the new plane state using the plane and atomic helper
1165 * functions for planes and crtcs. It assumes that the atomic state has already
1166 * been pushed into the relevant object state pointers, since this step can no
1169 * It still requires the global state object @old_state to know which planes and
1170 * crtcs need to be updated though.
1172 void drm_atomic_helper_commit_planes(struct drm_device *dev,
1173 struct drm_atomic_state *old_state)
1175 int nplanes = dev->mode_config.num_total_plane;
1176 int ncrtcs = dev->mode_config.num_crtc;
1179 for (i = 0; i < ncrtcs; i++) {
1180 struct drm_crtc_helper_funcs *funcs;
1181 struct drm_crtc *crtc = old_state->crtcs[i];
1186 funcs = crtc->helper_private;
1188 if (!funcs || !funcs->atomic_begin)
1191 funcs->atomic_begin(crtc);
1194 for (i = 0; i < nplanes; i++) {
1195 struct drm_plane_helper_funcs *funcs;
1196 struct drm_plane *plane = old_state->planes[i];
1197 struct drm_plane_state *old_plane_state;
1202 funcs = plane->helper_private;
1207 old_plane_state = old_state->plane_states[i];
1210 * Special-case disabling the plane if drivers support it.
1212 if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1213 funcs->atomic_disable)
1214 funcs->atomic_disable(plane, old_plane_state);
1216 funcs->atomic_update(plane, old_plane_state);
1219 for (i = 0; i < ncrtcs; i++) {
1220 struct drm_crtc_helper_funcs *funcs;
1221 struct drm_crtc *crtc = old_state->crtcs[i];
1226 funcs = crtc->helper_private;
1228 if (!funcs || !funcs->atomic_flush)
1231 funcs->atomic_flush(crtc);
1234 EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1237 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1239 * @old_state: atomic state object with old state structures
1241 * This function cleans up plane state, specifically framebuffers, from the old
1242 * configuration. Hence the old configuration must be perserved in @old_state to
1243 * be able to call this function.
1245 * This function must also be called on the new state when the atomic update
1246 * fails at any point after calling drm_atomic_helper_prepare_planes().
1248 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1249 struct drm_atomic_state *old_state)
1251 int nplanes = dev->mode_config.num_total_plane;
1254 for (i = 0; i < nplanes; i++) {
1255 struct drm_plane_helper_funcs *funcs;
1256 struct drm_plane *plane = old_state->planes[i];
1257 struct drm_framebuffer *old_fb;
1262 funcs = plane->helper_private;
1264 old_fb = old_state->plane_states[i]->fb;
1266 if (old_fb && funcs->cleanup_fb)
1267 funcs->cleanup_fb(plane, old_fb);
1270 EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1273 * drm_atomic_helper_swap_state - store atomic state into current sw state
1275 * @state: atomic state
1277 * This function stores the atomic state into the current state pointers in all
1278 * driver objects. It should be called after all failing steps have been done
1279 * and succeeded, but before the actual hardware state is committed.
1281 * For cleanup and error recovery the current state for all changed objects will
1282 * be swaped into @state.
1284 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1286 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1288 * 2. Do any other steps that might fail.
1290 * 3. Put the staged state into the current state pointers with this function.
1292 * 4. Actually commit the hardware state.
1294 * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1295 * contains the old state. Also do any other cleanup required with that state.
1297 void drm_atomic_helper_swap_state(struct drm_device *dev,
1298 struct drm_atomic_state *state)
1302 for (i = 0; i < dev->mode_config.num_connector; i++) {
1303 struct drm_connector *connector = state->connectors[i];
1308 connector->state->state = state;
1309 swap(state->connector_states[i], connector->state);
1310 connector->state->state = NULL;
1313 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1314 struct drm_crtc *crtc = state->crtcs[i];
1319 crtc->state->state = state;
1320 swap(state->crtc_states[i], crtc->state);
1321 crtc->state->state = NULL;
1324 for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1325 struct drm_plane *plane = state->planes[i];
1330 plane->state->state = state;
1331 swap(state->plane_states[i], plane->state);
1332 plane->state->state = NULL;
1335 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1338 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1339 * @plane: plane object to update
1340 * @crtc: owning CRTC of owning plane
1341 * @fb: framebuffer to flip onto plane
1342 * @crtc_x: x offset of primary plane on crtc
1343 * @crtc_y: y offset of primary plane on crtc
1344 * @crtc_w: width of primary plane rectangle on crtc
1345 * @crtc_h: height of primary plane rectangle on crtc
1346 * @src_x: x offset of @fb for panning
1347 * @src_y: y offset of @fb for panning
1348 * @src_w: width of source rectangle in @fb
1349 * @src_h: height of source rectangle in @fb
1351 * Provides a default plane update handler using the atomic driver interface.
1354 * Zero on success, error code on failure
1356 int drm_atomic_helper_update_plane(struct drm_plane *plane,
1357 struct drm_crtc *crtc,
1358 struct drm_framebuffer *fb,
1359 int crtc_x, int crtc_y,
1360 unsigned int crtc_w, unsigned int crtc_h,
1361 uint32_t src_x, uint32_t src_y,
1362 uint32_t src_w, uint32_t src_h)
1364 struct drm_atomic_state *state;
1365 struct drm_plane_state *plane_state;
1368 state = drm_atomic_state_alloc(plane->dev);
1372 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1374 plane_state = drm_atomic_get_plane_state(state, plane);
1375 if (IS_ERR(plane_state)) {
1376 ret = PTR_ERR(plane_state);
1380 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1383 drm_atomic_set_fb_for_plane(plane_state, fb);
1384 plane_state->crtc_x = crtc_x;
1385 plane_state->crtc_y = crtc_y;
1386 plane_state->crtc_h = crtc_h;
1387 plane_state->crtc_w = crtc_w;
1388 plane_state->src_x = src_x;
1389 plane_state->src_y = src_y;
1390 plane_state->src_h = src_h;
1391 plane_state->src_w = src_w;
1393 ret = drm_atomic_commit(state);
1397 if (plane == crtc->cursor)
1398 state->legacy_cursor_update = true;
1400 /* Driver takes ownership of state on successful commit. */
1403 if (ret == -EDEADLK)
1406 drm_atomic_state_free(state);
1410 drm_atomic_state_clear(state);
1411 drm_atomic_legacy_backoff(state);
1414 * Someone might have exchanged the framebuffer while we dropped locks
1415 * in the backoff code. We need to fix up the fb refcount tracking the
1418 plane->old_fb = plane->fb;
1422 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1425 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1426 * @plane: plane to disable
1428 * Provides a default plane disable handler using the atomic driver interface.
1431 * Zero on success, error code on failure
1433 int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1435 struct drm_atomic_state *state;
1436 struct drm_plane_state *plane_state;
1440 * FIXME: Without plane->crtc set we can't get at the implicit legacy
1441 * acquire context. The real fix will be to wire the acquire ctx through
1442 * everywhere we need it, but meanwhile prevent chaos by just skipping
1443 * this noop. The critical case is the cursor ioctls which a) only grab
1444 * crtc/cursor-plane locks (so we need the crtc to get at the right
1445 * acquire context) and b) can try to disable the plane multiple times.
1450 state = drm_atomic_state_alloc(plane->dev);
1454 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1456 plane_state = drm_atomic_get_plane_state(state, plane);
1457 if (IS_ERR(plane_state)) {
1458 ret = PTR_ERR(plane_state);
1462 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1465 drm_atomic_set_fb_for_plane(plane_state, NULL);
1466 plane_state->crtc_x = 0;
1467 plane_state->crtc_y = 0;
1468 plane_state->crtc_h = 0;
1469 plane_state->crtc_w = 0;
1470 plane_state->src_x = 0;
1471 plane_state->src_y = 0;
1472 plane_state->src_h = 0;
1473 plane_state->src_w = 0;
1475 if (plane == plane->crtc->cursor)
1476 state->legacy_cursor_update = true;
1478 ret = drm_atomic_commit(state);
1482 /* Driver takes ownership of state on successful commit. */
1485 if (ret == -EDEADLK)
1488 drm_atomic_state_free(state);
1492 drm_atomic_state_clear(state);
1493 drm_atomic_legacy_backoff(state);
1496 * Someone might have exchanged the framebuffer while we dropped locks
1497 * in the backoff code. We need to fix up the fb refcount tracking the
1500 plane->old_fb = plane->fb;
1504 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1506 static int update_output_state(struct drm_atomic_state *state,
1507 struct drm_mode_set *set)
1509 struct drm_device *dev = set->crtc->dev;
1510 struct drm_connector_state *conn_state;
1511 int ncrtcs = state->dev->mode_config.num_crtc;
1514 ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1515 state->acquire_ctx);
1519 /* First grab all affected connector/crtc states. */
1520 for (i = 0; i < set->num_connectors; i++) {
1521 conn_state = drm_atomic_get_connector_state(state,
1522 set->connectors[i]);
1523 if (IS_ERR(conn_state))
1524 return PTR_ERR(conn_state);
1527 for (i = 0; i < ncrtcs; i++) {
1528 struct drm_crtc *crtc = state->crtcs[i];
1533 ret = drm_atomic_add_affected_connectors(state, crtc);
1538 /* Then recompute connector->crtc links and crtc enabling state. */
1539 for (i = 0; i < state->num_connector; i++) {
1540 struct drm_connector *connector;
1542 connector = state->connectors[i];
1543 conn_state = state->connector_states[i];
1548 if (conn_state->crtc == set->crtc) {
1549 ret = drm_atomic_set_crtc_for_connector(conn_state,
1555 for (j = 0; j < set->num_connectors; j++) {
1556 if (set->connectors[j] == connector) {
1557 ret = drm_atomic_set_crtc_for_connector(conn_state,
1566 for (i = 0; i < ncrtcs; i++) {
1567 struct drm_crtc *crtc = state->crtcs[i];
1568 struct drm_crtc_state *crtc_state = state->crtc_states[i];
1573 /* Don't update ->enable for the CRTC in the set_config request,
1574 * since a mismatch would indicate a bug in the upper layers.
1575 * The actual modeset code later on will catch any
1576 * inconsistencies here. */
1577 if (crtc == set->crtc)
1580 crtc_state->enable =
1581 drm_atomic_connectors_for_crtc(state, crtc);
1588 * drm_atomic_helper_set_config - set a new config from userspace
1589 * @set: mode set configuration
1591 * Provides a default crtc set_config handler using the atomic driver interface.
1594 * Returns 0 on success, negative errno numbers on failure.
1596 int drm_atomic_helper_set_config(struct drm_mode_set *set)
1598 struct drm_atomic_state *state;
1599 struct drm_crtc *crtc = set->crtc;
1600 struct drm_crtc_state *crtc_state;
1601 struct drm_plane_state *primary_state;
1604 state = drm_atomic_state_alloc(crtc->dev);
1608 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1610 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1611 if (IS_ERR(crtc_state)) {
1612 ret = PTR_ERR(crtc_state);
1616 primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1617 if (IS_ERR(primary_state)) {
1618 ret = PTR_ERR(primary_state);
1624 WARN_ON(set->num_connectors);
1626 crtc_state->enable = false;
1627 crtc_state->active = false;
1629 ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1633 drm_atomic_set_fb_for_plane(primary_state, NULL);
1639 WARN_ON(!set->num_connectors);
1641 crtc_state->enable = true;
1642 crtc_state->active = true;
1643 drm_mode_copy(&crtc_state->mode, set->mode);
1645 ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1648 drm_atomic_set_fb_for_plane(primary_state, set->fb);
1649 primary_state->crtc_x = 0;
1650 primary_state->crtc_y = 0;
1651 primary_state->crtc_h = set->mode->vdisplay;
1652 primary_state->crtc_w = set->mode->hdisplay;
1653 primary_state->src_x = set->x << 16;
1654 primary_state->src_y = set->y << 16;
1655 primary_state->src_h = set->mode->vdisplay << 16;
1656 primary_state->src_w = set->mode->hdisplay << 16;
1659 ret = update_output_state(state, set);
1663 ret = drm_atomic_commit(state);
1667 /* Driver takes ownership of state on successful commit. */
1670 if (ret == -EDEADLK)
1673 drm_atomic_state_free(state);
1677 drm_atomic_state_clear(state);
1678 drm_atomic_legacy_backoff(state);
1681 * Someone might have exchanged the framebuffer while we dropped locks
1682 * in the backoff code. We need to fix up the fb refcount tracking the
1685 crtc->primary->old_fb = crtc->primary->fb;
1689 EXPORT_SYMBOL(drm_atomic_helper_set_config);
1692 * drm_atomic_helper_crtc_set_property - helper for crtc properties
1694 * @property: DRM property
1695 * @val: value of property
1697 * Provides a default crtc set_property handler using the atomic driver
1701 * Zero on success, error code on failure
1704 drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1705 struct drm_property *property,
1708 struct drm_atomic_state *state;
1709 struct drm_crtc_state *crtc_state;
1712 state = drm_atomic_state_alloc(crtc->dev);
1716 /* ->set_property is always called with all locks held. */
1717 state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1719 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1720 if (IS_ERR(crtc_state)) {
1721 ret = PTR_ERR(crtc_state);
1725 ret = drm_atomic_crtc_set_property(crtc, crtc_state,
1730 ret = drm_atomic_commit(state);
1734 /* Driver takes ownership of state on successful commit. */
1737 if (ret == -EDEADLK)
1740 drm_atomic_state_free(state);
1744 drm_atomic_state_clear(state);
1745 drm_atomic_legacy_backoff(state);
1749 EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1752 * drm_atomic_helper_plane_set_property - helper for plane properties
1754 * @property: DRM property
1755 * @val: value of property
1757 * Provides a default plane set_property handler using the atomic driver
1761 * Zero on success, error code on failure
1764 drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1765 struct drm_property *property,
1768 struct drm_atomic_state *state;
1769 struct drm_plane_state *plane_state;
1772 state = drm_atomic_state_alloc(plane->dev);
1776 /* ->set_property is always called with all locks held. */
1777 state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1779 plane_state = drm_atomic_get_plane_state(state, plane);
1780 if (IS_ERR(plane_state)) {
1781 ret = PTR_ERR(plane_state);
1785 ret = drm_atomic_plane_set_property(plane, plane_state,
1790 ret = drm_atomic_commit(state);
1794 /* Driver takes ownership of state on successful commit. */
1797 if (ret == -EDEADLK)
1800 drm_atomic_state_free(state);
1804 drm_atomic_state_clear(state);
1805 drm_atomic_legacy_backoff(state);
1809 EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1812 * drm_atomic_helper_connector_set_property - helper for connector properties
1813 * @connector: DRM connector
1814 * @property: DRM property
1815 * @val: value of property
1817 * Provides a default connector set_property handler using the atomic driver
1821 * Zero on success, error code on failure
1824 drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1825 struct drm_property *property,
1828 struct drm_atomic_state *state;
1829 struct drm_connector_state *connector_state;
1832 state = drm_atomic_state_alloc(connector->dev);
1836 /* ->set_property is always called with all locks held. */
1837 state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1839 connector_state = drm_atomic_get_connector_state(state, connector);
1840 if (IS_ERR(connector_state)) {
1841 ret = PTR_ERR(connector_state);
1845 ret = drm_atomic_connector_set_property(connector, connector_state,
1850 ret = drm_atomic_commit(state);
1854 /* Driver takes ownership of state on successful commit. */
1857 if (ret == -EDEADLK)
1860 drm_atomic_state_free(state);
1864 drm_atomic_state_clear(state);
1865 drm_atomic_legacy_backoff(state);
1869 EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
1872 * drm_atomic_helper_page_flip - execute a legacy page flip
1874 * @fb: DRM framebuffer
1875 * @event: optional DRM event to signal upon completion
1876 * @flags: flip flags for non-vblank sync'ed updates
1878 * Provides a default page flip implementation using the atomic driver interface.
1880 * Note that for now so called async page flips (i.e. updates which are not
1881 * synchronized to vblank) are not supported, since the atomic interfaces have
1882 * no provisions for this yet.
1885 * Returns 0 on success, negative errno numbers on failure.
1887 int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
1888 struct drm_framebuffer *fb,
1889 struct drm_pending_vblank_event *event,
1892 struct drm_plane *plane = crtc->primary;
1893 struct drm_atomic_state *state;
1894 struct drm_plane_state *plane_state;
1895 struct drm_crtc_state *crtc_state;
1898 if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
1901 state = drm_atomic_state_alloc(plane->dev);
1905 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1907 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1908 if (IS_ERR(crtc_state)) {
1909 ret = PTR_ERR(crtc_state);
1912 crtc_state->event = event;
1914 plane_state = drm_atomic_get_plane_state(state, plane);
1915 if (IS_ERR(plane_state)) {
1916 ret = PTR_ERR(plane_state);
1920 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1923 drm_atomic_set_fb_for_plane(plane_state, fb);
1925 ret = drm_atomic_async_commit(state);
1929 /* TODO: ->page_flip is the only driver callback where the core
1930 * doesn't update plane->fb. For now patch it up here. */
1931 plane->fb = plane->state->fb;
1933 /* Driver takes ownership of state on successful async commit. */
1936 if (ret == -EDEADLK)
1939 drm_atomic_state_free(state);
1943 drm_atomic_state_clear(state);
1944 drm_atomic_legacy_backoff(state);
1947 * Someone might have exchanged the framebuffer while we dropped locks
1948 * in the backoff code. We need to fix up the fb refcount tracking the
1951 plane->old_fb = plane->fb;
1955 EXPORT_SYMBOL(drm_atomic_helper_page_flip);
1958 * drm_atomic_helper_connector_dpms() - connector dpms helper implementation
1959 * @connector: affected connector
1962 * This is the main helper function provided by the atomic helper framework for
1963 * implementing the legacy DPMS connector interface. It computes the new desired
1964 * ->active state for the corresponding CRTC (if the connector is enabled) and
1967 void drm_atomic_helper_connector_dpms(struct drm_connector *connector,
1970 struct drm_mode_config *config = &connector->dev->mode_config;
1971 struct drm_atomic_state *state;
1972 struct drm_crtc_state *crtc_state;
1973 struct drm_crtc *crtc;
1974 struct drm_connector *tmp_connector;
1976 bool active = false;
1978 if (mode != DRM_MODE_DPMS_ON)
1979 mode = DRM_MODE_DPMS_OFF;
1981 connector->dpms = mode;
1982 crtc = connector->state->crtc;
1987 /* FIXME: ->dpms has no return value so can't forward the -ENOMEM. */
1988 state = drm_atomic_state_alloc(connector->dev);
1992 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1994 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1995 if (IS_ERR(crtc_state))
1998 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
2000 list_for_each_entry(tmp_connector, &config->connector_list, head) {
2001 if (connector->state->crtc != crtc)
2004 if (connector->dpms == DRM_MODE_DPMS_ON) {
2009 crtc_state->active = active;
2011 ret = drm_atomic_commit(state);
2015 /* Driver takes ownership of state on successful async commit. */
2018 if (ret == -EDEADLK)
2021 drm_atomic_state_free(state);
2023 WARN(1, "Driver bug: Changing ->active failed with ret=%i\n", ret);
2027 drm_atomic_state_clear(state);
2028 drm_atomic_legacy_backoff(state);
2032 EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
2035 * DOC: atomic state reset and initialization
2037 * Both the drm core and the atomic helpers assume that there is always the full
2038 * and correct atomic software state for all connectors, CRTCs and planes
2039 * available. Which is a bit a problem on driver load and also after system
2040 * suspend. One way to solve this is to have a hardware state read-out
2041 * infrastructure which reconstructs the full software state (e.g. the i915
2044 * The simpler solution is to just reset the software state to everything off,
2045 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
2046 * the atomic helpers provide default reset implementations for all hooks.
2050 * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
2053 * Resets the atomic state for @crtc by freeing the state pointer (which might
2054 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2056 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
2059 crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
2062 crtc->state->crtc = crtc;
2064 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
2067 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
2070 * Default CRTC state duplicate hook for drivers which don't have their own
2071 * subclassed CRTC state structure.
2073 struct drm_crtc_state *
2074 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
2076 struct drm_crtc_state *state;
2078 if (WARN_ON(!crtc->state))
2081 state = kmemdup(crtc->state, sizeof(*crtc->state), GFP_KERNEL);
2084 state->mode_changed = false;
2085 state->active_changed = false;
2086 state->planes_changed = false;
2087 state->event = NULL;
2092 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
2095 * drm_atomic_helper_crtc_destroy_state - default state destroy hook
2097 * @state: CRTC state object to release
2099 * Default CRTC state destroy hook for drivers which don't have their own
2100 * subclassed CRTC state structure.
2102 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
2103 struct drm_crtc_state *state)
2107 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
2110 * drm_atomic_helper_plane_reset - default ->reset hook for planes
2113 * Resets the atomic state for @plane by freeing the state pointer (which might
2114 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2116 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
2118 if (plane->state && plane->state->fb)
2119 drm_framebuffer_unreference(plane->state->fb);
2121 kfree(plane->state);
2122 plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
2125 plane->state->plane = plane;
2127 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
2130 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
2133 * Default plane state duplicate hook for drivers which don't have their own
2134 * subclassed plane state structure.
2136 struct drm_plane_state *
2137 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
2139 struct drm_plane_state *state;
2141 if (WARN_ON(!plane->state))
2144 state = kmemdup(plane->state, sizeof(*plane->state), GFP_KERNEL);
2146 if (state && state->fb)
2147 drm_framebuffer_reference(state->fb);
2151 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
2154 * drm_atomic_helper_plane_destroy_state - default state destroy hook
2156 * @state: plane state object to release
2158 * Default plane state destroy hook for drivers which don't have their own
2159 * subclassed plane state structure.
2161 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
2162 struct drm_plane_state *state)
2165 drm_framebuffer_unreference(state->fb);
2169 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
2172 * drm_atomic_helper_connector_reset - default ->reset hook for connectors
2173 * @connector: drm connector
2175 * Resets the atomic state for @connector by freeing the state pointer (which
2176 * might be NULL, e.g. at driver load time) and allocating a new empty state
2179 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
2181 kfree(connector->state);
2182 connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
2184 if (connector->state)
2185 connector->state->connector = connector;
2187 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
2190 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
2191 * @connector: drm connector
2193 * Default connector state duplicate hook for drivers which don't have their own
2194 * subclassed connector state structure.
2196 struct drm_connector_state *
2197 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
2199 if (WARN_ON(!connector->state))
2202 return kmemdup(connector->state, sizeof(*connector->state), GFP_KERNEL);
2204 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
2207 * drm_atomic_helper_connector_destroy_state - default state destroy hook
2208 * @connector: drm connector
2209 * @state: connector state object to release
2211 * Default connector state destroy hook for drivers which don't have their own
2212 * subclassed connector state structure.
2214 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
2215 struct drm_connector_state *state)
2219 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);