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 const 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 struct drm_crtc *crtc;
252 struct drm_crtc_state *crtc_state;
253 struct drm_connector *connector;
254 struct drm_connector_state *conn_state;
258 for_each_crtc_in_state(state, crtc, crtc_state, i) {
259 if (!crtc_state->mode_changed)
262 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
265 for_each_connector_in_state(state, connector, conn_state, i) {
266 const struct drm_encoder_helper_funcs *funcs;
267 struct drm_encoder *encoder;
269 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
271 if (!conn_state->crtc || !conn_state->best_encoder)
275 state->crtc_states[drm_crtc_index(conn_state->crtc)];
278 * Each encoder has at most one connector (since we always steal
279 * it away), so we won't call ->mode_fixup twice.
281 encoder = conn_state->best_encoder;
282 funcs = encoder->helper_private;
284 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
285 ret = encoder->bridge->funcs->mode_fixup(
286 encoder->bridge, &crtc_state->mode,
287 &crtc_state->adjusted_mode);
289 DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
294 if (funcs->atomic_check) {
295 ret = funcs->atomic_check(encoder, crtc_state,
298 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
299 encoder->base.id, encoder->name);
303 ret = funcs->mode_fixup(encoder, &crtc_state->mode,
304 &crtc_state->adjusted_mode);
306 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
307 encoder->base.id, encoder->name);
313 for_each_crtc_in_state(state, crtc, crtc_state, i) {
314 const struct drm_crtc_helper_funcs *funcs;
316 if (!crtc_state->mode_changed)
319 funcs = crtc->helper_private;
320 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
321 &crtc_state->adjusted_mode);
323 DRM_DEBUG_ATOMIC("[CRTC:%d] fixup failed\n",
333 needs_modeset(struct drm_crtc_state *state)
335 return state->mode_changed || state->active_changed;
339 * drm_atomic_helper_check_modeset - validate state object for modeset changes
341 * @state: the driver state object
343 * Check the state object to see if the requested state is physically possible.
344 * This does all the crtc and connector related computations for an atomic
345 * update. It computes and updates crtc_state->mode_changed, adds any additional
346 * connectors needed for full modesets and calls down into ->mode_fixup
347 * functions of the driver backend.
351 * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
352 * plane update can't be done without a full modeset) _must_ call this function
353 * afterwards after that change. It is permitted to call this function multiple
354 * times for the same update, e.g. when the ->atomic_check functions depend upon
355 * the adjusted dotclock for fifo space allocation and watermark computation.
358 * Zero for success or -errno
361 drm_atomic_helper_check_modeset(struct drm_device *dev,
362 struct drm_atomic_state *state)
364 struct drm_crtc *crtc;
365 struct drm_crtc_state *crtc_state;
366 struct drm_connector *connector;
367 struct drm_connector_state *connector_state;
370 for_each_crtc_in_state(state, crtc, crtc_state, i) {
371 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
372 DRM_DEBUG_ATOMIC("[CRTC:%d] mode changed\n",
374 crtc_state->mode_changed = true;
377 if (crtc->state->enable != crtc_state->enable) {
378 DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
380 crtc_state->mode_changed = true;
384 for_each_connector_in_state(state, connector, connector_state, i) {
386 * This only sets crtc->mode_changed for routing changes,
387 * drivers must set crtc->mode_changed themselves when connector
388 * properties need to be updated.
390 ret = update_connector_routing(state, i);
396 * After all the routing has been prepared we need to add in any
397 * connector which is itself unchanged, but who's crtc changes it's
398 * configuration. This must be done before calling mode_fixup in case a
399 * crtc only changed its mode but has the same set of connectors.
401 for_each_crtc_in_state(state, crtc, crtc_state, i) {
405 * We must set ->active_changed after walking connectors for
406 * otherwise an update that only changes active would result in
407 * a full modeset because update_connector_routing force that.
409 if (crtc->state->active != crtc_state->active) {
410 DRM_DEBUG_ATOMIC("[CRTC:%d] active changed\n",
412 crtc_state->active_changed = true;
415 if (!needs_modeset(crtc_state))
418 DRM_DEBUG_ATOMIC("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
420 crtc_state->enable ? 'y' : 'n',
421 crtc_state->active ? 'y' : 'n');
423 ret = drm_atomic_add_affected_connectors(state, crtc);
427 num_connectors = drm_atomic_connectors_for_crtc(state,
430 if (crtc_state->enable != !!num_connectors) {
431 DRM_DEBUG_ATOMIC("[CRTC:%d] enabled/connectors mismatch\n",
438 return mode_fixup(state);
440 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
443 * drm_atomic_helper_check_planes - validate state object for planes changes
445 * @state: the driver state object
447 * Check the state object to see if the requested state is physically possible.
448 * This does all the plane update related checks using by calling into the
449 * ->atomic_check hooks provided by the driver.
452 * Zero for success or -errno
455 drm_atomic_helper_check_planes(struct drm_device *dev,
456 struct drm_atomic_state *state)
458 struct drm_crtc *crtc;
459 struct drm_crtc_state *crtc_state;
460 struct drm_plane *plane;
461 struct drm_plane_state *plane_state;
464 for_each_plane_in_state(state, plane, plane_state, i) {
465 const struct drm_plane_helper_funcs *funcs;
467 funcs = plane->helper_private;
469 drm_atomic_helper_plane_changed(state, plane_state, plane);
471 if (!funcs || !funcs->atomic_check)
474 ret = funcs->atomic_check(plane, plane_state);
476 DRM_DEBUG_ATOMIC("[PLANE:%d] atomic driver check failed\n",
482 for_each_crtc_in_state(state, crtc, crtc_state, i) {
483 const struct drm_crtc_helper_funcs *funcs;
485 funcs = crtc->helper_private;
487 if (!funcs || !funcs->atomic_check)
490 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
492 DRM_DEBUG_ATOMIC("[CRTC:%d] atomic driver check failed\n",
500 EXPORT_SYMBOL(drm_atomic_helper_check_planes);
503 * drm_atomic_helper_check - validate state object
505 * @state: the driver state object
507 * Check the state object to see if the requested state is physically possible.
508 * Only crtcs and planes have check callbacks, so for any additional (global)
509 * checking that a driver needs it can simply wrap that around this function.
510 * Drivers without such needs can directly use this as their ->atomic_check()
513 * This just wraps the two parts of the state checking for planes and modeset
514 * state in the default order: First it calls drm_atomic_helper_check_modeset()
515 * and then drm_atomic_helper_check_planes(). The assumption is that the
516 * ->atomic_check functions depend upon an updated adjusted_mode.clock to
517 * e.g. properly compute watermarks.
520 * Zero for success or -errno
522 int drm_atomic_helper_check(struct drm_device *dev,
523 struct drm_atomic_state *state)
527 ret = drm_atomic_helper_check_modeset(dev, state);
531 ret = drm_atomic_helper_check_planes(dev, state);
537 EXPORT_SYMBOL(drm_atomic_helper_check);
540 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
542 struct drm_connector *connector;
543 struct drm_connector_state *old_conn_state;
544 struct drm_crtc *crtc;
545 struct drm_crtc_state *old_crtc_state;
548 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
549 const struct drm_encoder_helper_funcs *funcs;
550 struct drm_encoder *encoder;
551 struct drm_crtc_state *old_crtc_state;
553 /* Shut down everything that's in the changeset and currently
554 * still on. So need to check the old, saved state. */
555 if (!old_conn_state->crtc)
558 old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
560 if (!old_crtc_state->active ||
561 !needs_modeset(old_conn_state->crtc->state))
564 encoder = old_conn_state->best_encoder;
566 /* We shouldn't get this far if we didn't previously have
567 * an encoder.. but WARN_ON() rather than explode.
569 if (WARN_ON(!encoder))
572 funcs = encoder->helper_private;
574 DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
575 encoder->base.id, encoder->name);
578 * Each encoder has at most one connector (since we always steal
579 * it away), so we won't call disable hooks twice.
582 encoder->bridge->funcs->disable(encoder->bridge);
584 /* Right function depends upon target state. */
585 if (connector->state->crtc && funcs->prepare)
586 funcs->prepare(encoder);
587 else if (funcs->disable)
588 funcs->disable(encoder);
590 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
593 encoder->bridge->funcs->post_disable(encoder->bridge);
596 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
597 const struct drm_crtc_helper_funcs *funcs;
599 /* Shut down everything that needs a full modeset. */
600 if (!needs_modeset(crtc->state))
603 if (!old_crtc_state->active)
606 funcs = crtc->helper_private;
608 DRM_DEBUG_ATOMIC("disabling [CRTC:%d]\n",
612 /* Right function depends upon target state. */
613 if (crtc->state->enable && funcs->prepare)
614 funcs->prepare(crtc);
615 else if (funcs->disable)
616 funcs->disable(crtc);
618 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
623 set_routing_links(struct drm_device *dev, struct drm_atomic_state *old_state)
625 struct drm_connector *connector;
626 struct drm_connector_state *old_conn_state;
627 struct drm_crtc *crtc;
628 struct drm_crtc_state *old_crtc_state;
631 /* clear out existing links */
632 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
633 if (!connector->encoder)
636 WARN_ON(!connector->encoder->crtc);
638 connector->encoder->crtc = NULL;
639 connector->encoder = NULL;
643 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
644 if (!connector->state->crtc)
647 if (WARN_ON(!connector->state->best_encoder))
650 connector->encoder = connector->state->best_encoder;
651 connector->encoder->crtc = connector->state->crtc;
654 /* set legacy state in the crtc structure */
655 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
656 crtc->mode = crtc->state->mode;
657 crtc->enabled = crtc->state->enable;
658 crtc->x = crtc->primary->state->src_x >> 16;
659 crtc->y = crtc->primary->state->src_y >> 16;
664 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
666 struct drm_crtc *crtc;
667 struct drm_crtc_state *old_crtc_state;
668 struct drm_connector *connector;
669 struct drm_connector_state *old_conn_state;
672 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
673 const struct drm_crtc_helper_funcs *funcs;
675 if (!crtc->state->mode_changed)
678 funcs = crtc->helper_private;
680 if (crtc->state->enable && funcs->mode_set_nofb) {
681 DRM_DEBUG_ATOMIC("modeset on [CRTC:%d]\n",
684 funcs->mode_set_nofb(crtc);
688 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
689 const struct drm_encoder_helper_funcs *funcs;
690 struct drm_crtc_state *new_crtc_state;
691 struct drm_encoder *encoder;
692 struct drm_display_mode *mode, *adjusted_mode;
694 if (!connector->state->best_encoder)
697 encoder = connector->state->best_encoder;
698 funcs = encoder->helper_private;
699 new_crtc_state = connector->state->crtc->state;
700 mode = &new_crtc_state->mode;
701 adjusted_mode = &new_crtc_state->adjusted_mode;
703 if (!new_crtc_state->mode_changed)
706 DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
707 encoder->base.id, encoder->name);
710 * Each encoder has at most one connector (since we always steal
711 * it away), so we won't call mode_set hooks twice.
714 funcs->mode_set(encoder, mode, adjusted_mode);
716 if (encoder->bridge && encoder->bridge->funcs->mode_set)
717 encoder->bridge->funcs->mode_set(encoder->bridge,
718 mode, adjusted_mode);
723 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
725 * @old_state: atomic state object with old state structures
727 * This function shuts down all the outputs that need to be shut down and
728 * prepares them (if required) with the new mode.
730 * For compatability with legacy crtc helpers this should be called before
731 * drm_atomic_helper_commit_planes(), which is what the default commit function
732 * does. But drivers with different needs can group the modeset commits together
733 * and do the plane commits at the end. This is useful for drivers doing runtime
734 * PM since planes updates then only happen when the CRTC is actually enabled.
736 void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
737 struct drm_atomic_state *old_state)
739 disable_outputs(dev, old_state);
740 set_routing_links(dev, old_state);
741 crtc_set_mode(dev, old_state);
743 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
746 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
748 * @old_state: atomic state object with old state structures
750 * This function enables all the outputs with the new configuration which had to
751 * be turned off for the update.
753 * For compatability with legacy crtc helpers this should be called after
754 * drm_atomic_helper_commit_planes(), which is what the default commit function
755 * does. But drivers with different needs can group the modeset commits together
756 * and do the plane commits at the end. This is useful for drivers doing runtime
757 * PM since planes updates then only happen when the CRTC is actually enabled.
759 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
760 struct drm_atomic_state *old_state)
762 struct drm_crtc *crtc;
763 struct drm_crtc_state *old_crtc_state;
764 struct drm_connector *connector;
765 struct drm_connector_state *old_conn_state;
768 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
769 const struct drm_crtc_helper_funcs *funcs;
771 /* Need to filter out CRTCs where only planes change. */
772 if (!needs_modeset(crtc->state))
775 if (!crtc->state->active)
778 funcs = crtc->helper_private;
780 if (crtc->state->enable) {
781 DRM_DEBUG_ATOMIC("enabling [CRTC:%d]\n",
791 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
792 const struct drm_encoder_helper_funcs *funcs;
793 struct drm_encoder *encoder;
795 if (!connector->state->best_encoder)
798 if (!connector->state->crtc->state->active ||
799 !needs_modeset(connector->state->crtc->state))
802 encoder = connector->state->best_encoder;
803 funcs = encoder->helper_private;
805 DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
806 encoder->base.id, encoder->name);
809 * Each encoder has at most one connector (since we always steal
810 * it away), so we won't call enable hooks twice.
813 encoder->bridge->funcs->pre_enable(encoder->bridge);
816 funcs->enable(encoder);
818 funcs->commit(encoder);
821 encoder->bridge->funcs->enable(encoder->bridge);
824 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
826 static void wait_for_fences(struct drm_device *dev,
827 struct drm_atomic_state *state)
829 struct drm_plane *plane;
830 struct drm_plane_state *plane_state;
833 for_each_plane_in_state(state, plane, plane_state, i) {
834 if (!plane->state->fence)
837 WARN_ON(!plane->state->fb);
839 fence_wait(plane->state->fence, false);
840 fence_put(plane->state->fence);
841 plane->state->fence = NULL;
845 static bool framebuffer_changed(struct drm_device *dev,
846 struct drm_atomic_state *old_state,
847 struct drm_crtc *crtc)
849 struct drm_plane *plane;
850 struct drm_plane_state *old_plane_state;
853 for_each_plane_in_state(old_state, plane, old_plane_state, i) {
854 if (plane->state->crtc != crtc &&
855 old_plane_state->crtc != crtc)
858 if (plane->state->fb != old_plane_state->fb)
866 * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
868 * @old_state: atomic state object with old state structures
870 * Helper to, after atomic commit, wait for vblanks on all effected
871 * crtcs (ie. before cleaning up old framebuffers using
872 * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
873 * framebuffers have actually changed to optimize for the legacy cursor and
874 * plane update use-case.
877 drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
878 struct drm_atomic_state *old_state)
880 struct drm_crtc *crtc;
881 struct drm_crtc_state *old_crtc_state;
884 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
885 /* No one cares about the old state, so abuse it for tracking
886 * and store whether we hold a vblank reference (and should do a
887 * vblank wait) in the ->enable boolean. */
888 old_crtc_state->enable = false;
890 if (!crtc->state->enable)
893 /* Legacy cursor ioctls are completely unsynced, and userspace
894 * relies on that (by doing tons of cursor updates). */
895 if (old_state->legacy_cursor_update)
898 if (!framebuffer_changed(dev, old_state, crtc))
901 ret = drm_crtc_vblank_get(crtc);
905 old_crtc_state->enable = true;
906 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
909 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
910 if (!old_crtc_state->enable)
913 ret = wait_event_timeout(dev->vblank[i].queue,
914 old_crtc_state->last_vblank_count !=
915 drm_vblank_count(dev, i),
916 msecs_to_jiffies(50));
918 drm_crtc_vblank_put(crtc);
921 EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
924 * drm_atomic_helper_commit - commit validated state object
926 * @state: the driver state object
927 * @async: asynchronous commit
929 * This function commits a with drm_atomic_helper_check() pre-validated state
930 * object. This can still fail when e.g. the framebuffer reservation fails. For
931 * now this doesn't implement asynchronous commits.
934 * Zero for success or -errno.
936 int drm_atomic_helper_commit(struct drm_device *dev,
937 struct drm_atomic_state *state,
945 ret = drm_atomic_helper_prepare_planes(dev, state);
950 * This is the point of no return - everything below never fails except
951 * when the hw goes bonghits. Which means we can commit the new state on
952 * the software side now.
955 drm_atomic_helper_swap_state(dev, state);
958 * Everything below can be run asynchronously without the need to grab
959 * any modeset locks at all under one condition: It must be guaranteed
960 * that the asynchronous work has either been cancelled (if the driver
961 * supports it, which at least requires that the framebuffers get
962 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
963 * before the new state gets committed on the software side with
964 * drm_atomic_helper_swap_state().
966 * This scheme allows new atomic state updates to be prepared and
967 * checked in parallel to the asynchronous completion of the previous
968 * update. Which is important since compositors need to figure out the
969 * composition of the next frame right after having submitted the
973 wait_for_fences(dev, state);
975 drm_atomic_helper_commit_modeset_disables(dev, state);
977 drm_atomic_helper_commit_planes(dev, state);
979 drm_atomic_helper_commit_modeset_enables(dev, state);
981 drm_atomic_helper_wait_for_vblanks(dev, state);
983 drm_atomic_helper_cleanup_planes(dev, state);
985 drm_atomic_state_free(state);
989 EXPORT_SYMBOL(drm_atomic_helper_commit);
992 * DOC: implementing async commit
994 * For now the atomic helpers don't support async commit directly. If there is
995 * real need it could be added though, using the dma-buf fence infrastructure
996 * for generic synchronization with outstanding rendering.
998 * For now drivers have to implement async commit themselves, with the following
999 * sequence being the recommended one:
1001 * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
1002 * which commit needs to call which can fail, so we want to run it first and
1005 * 2. Synchronize with any outstanding asynchronous commit worker threads which
1006 * might be affected the new state update. This can be done by either cancelling
1007 * or flushing the work items, depending upon whether the driver can deal with
1008 * cancelled updates. Note that it is important to ensure that the framebuffer
1009 * cleanup is still done when cancelling.
1011 * For sufficient parallelism it is recommended to have a work item per crtc
1012 * (for updates which don't touch global state) and a global one. Then we only
1013 * need to synchronize with the crtc work items for changed crtcs and the global
1014 * work item, which allows nice concurrent updates on disjoint sets of crtcs.
1016 * 3. The software state is updated synchronously with
1017 * drm_atomic_helper_swap_state. Doing this under the protection of all modeset
1018 * locks means concurrent callers never see inconsistent state. And doing this
1019 * while it's guaranteed that no relevant async worker runs means that async
1020 * workers do not need grab any locks. Actually they must not grab locks, for
1021 * otherwise the work flushing will deadlock.
1023 * 4. Schedule a work item to do all subsequent steps, using the split-out
1024 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1025 * then cleaning up the framebuffers after the old framebuffer is no longer
1030 * drm_atomic_helper_prepare_planes - prepare plane resources before commit
1032 * @state: atomic state object with new state structures
1034 * This function prepares plane state, specifically framebuffers, for the new
1035 * configuration. If any failure is encountered this function will call
1036 * ->cleanup_fb on any already successfully prepared framebuffer.
1039 * 0 on success, negative error code on failure.
1041 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
1042 struct drm_atomic_state *state)
1044 int nplanes = dev->mode_config.num_total_plane;
1047 for (i = 0; i < nplanes; i++) {
1048 const struct drm_plane_helper_funcs *funcs;
1049 struct drm_plane *plane = state->planes[i];
1050 struct drm_plane_state *plane_state = state->plane_states[i];
1051 struct drm_framebuffer *fb;
1056 funcs = plane->helper_private;
1058 fb = plane_state->fb;
1060 if (fb && funcs->prepare_fb) {
1061 ret = funcs->prepare_fb(plane, fb, plane_state);
1070 for (i--; i >= 0; i--) {
1071 const struct drm_plane_helper_funcs *funcs;
1072 struct drm_plane *plane = state->planes[i];
1073 struct drm_plane_state *plane_state = state->plane_states[i];
1074 struct drm_framebuffer *fb;
1079 funcs = plane->helper_private;
1081 fb = state->plane_states[i]->fb;
1083 if (fb && funcs->cleanup_fb)
1084 funcs->cleanup_fb(plane, fb, plane_state);
1090 EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1093 * drm_atomic_helper_commit_planes - commit plane state
1095 * @old_state: atomic state object with old state structures
1097 * This function commits the new plane state using the plane and atomic helper
1098 * functions for planes and crtcs. It assumes that the atomic state has already
1099 * been pushed into the relevant object state pointers, since this step can no
1102 * It still requires the global state object @old_state to know which planes and
1103 * crtcs need to be updated though.
1105 void drm_atomic_helper_commit_planes(struct drm_device *dev,
1106 struct drm_atomic_state *old_state)
1108 struct drm_crtc *crtc;
1109 struct drm_crtc_state *old_crtc_state;
1110 struct drm_plane *plane;
1111 struct drm_plane_state *old_plane_state;
1114 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1115 const struct drm_crtc_helper_funcs *funcs;
1117 funcs = crtc->helper_private;
1119 if (!funcs || !funcs->atomic_begin)
1122 funcs->atomic_begin(crtc);
1125 for_each_plane_in_state(old_state, plane, old_plane_state, i) {
1126 const struct drm_plane_helper_funcs *funcs;
1128 funcs = plane->helper_private;
1133 old_plane_state = old_state->plane_states[i];
1136 * Special-case disabling the plane if drivers support it.
1138 if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1139 funcs->atomic_disable)
1140 funcs->atomic_disable(plane, old_plane_state);
1142 funcs->atomic_update(plane, old_plane_state);
1145 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1146 const struct drm_crtc_helper_funcs *funcs;
1148 funcs = crtc->helper_private;
1150 if (!funcs || !funcs->atomic_flush)
1153 funcs->atomic_flush(crtc);
1156 EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1159 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1161 * @old_state: atomic state object with old state structures
1163 * This function cleans up plane state, specifically framebuffers, from the old
1164 * configuration. Hence the old configuration must be perserved in @old_state to
1165 * be able to call this function.
1167 * This function must also be called on the new state when the atomic update
1168 * fails at any point after calling drm_atomic_helper_prepare_planes().
1170 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1171 struct drm_atomic_state *old_state)
1173 struct drm_plane *plane;
1174 struct drm_plane_state *plane_state;
1177 for_each_plane_in_state(old_state, plane, plane_state, i) {
1178 const struct drm_plane_helper_funcs *funcs;
1179 struct drm_framebuffer *old_fb;
1181 funcs = plane->helper_private;
1183 old_fb = plane_state->fb;
1185 if (old_fb && funcs->cleanup_fb)
1186 funcs->cleanup_fb(plane, old_fb, plane_state);
1189 EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1192 * drm_atomic_helper_swap_state - store atomic state into current sw state
1194 * @state: atomic state
1196 * This function stores the atomic state into the current state pointers in all
1197 * driver objects. It should be called after all failing steps have been done
1198 * and succeeded, but before the actual hardware state is committed.
1200 * For cleanup and error recovery the current state for all changed objects will
1201 * be swaped into @state.
1203 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1205 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1207 * 2. Do any other steps that might fail.
1209 * 3. Put the staged state into the current state pointers with this function.
1211 * 4. Actually commit the hardware state.
1213 * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1214 * contains the old state. Also do any other cleanup required with that state.
1216 void drm_atomic_helper_swap_state(struct drm_device *dev,
1217 struct drm_atomic_state *state)
1221 for (i = 0; i < dev->mode_config.num_connector; i++) {
1222 struct drm_connector *connector = state->connectors[i];
1227 connector->state->state = state;
1228 swap(state->connector_states[i], connector->state);
1229 connector->state->state = NULL;
1232 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1233 struct drm_crtc *crtc = state->crtcs[i];
1238 crtc->state->state = state;
1239 swap(state->crtc_states[i], crtc->state);
1240 crtc->state->state = NULL;
1243 for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1244 struct drm_plane *plane = state->planes[i];
1249 plane->state->state = state;
1250 swap(state->plane_states[i], plane->state);
1251 plane->state->state = NULL;
1254 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1257 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1258 * @plane: plane object to update
1259 * @crtc: owning CRTC of owning plane
1260 * @fb: framebuffer to flip onto plane
1261 * @crtc_x: x offset of primary plane on crtc
1262 * @crtc_y: y offset of primary plane on crtc
1263 * @crtc_w: width of primary plane rectangle on crtc
1264 * @crtc_h: height of primary plane rectangle on crtc
1265 * @src_x: x offset of @fb for panning
1266 * @src_y: y offset of @fb for panning
1267 * @src_w: width of source rectangle in @fb
1268 * @src_h: height of source rectangle in @fb
1270 * Provides a default plane update handler using the atomic driver interface.
1273 * Zero on success, error code on failure
1275 int drm_atomic_helper_update_plane(struct drm_plane *plane,
1276 struct drm_crtc *crtc,
1277 struct drm_framebuffer *fb,
1278 int crtc_x, int crtc_y,
1279 unsigned int crtc_w, unsigned int crtc_h,
1280 uint32_t src_x, uint32_t src_y,
1281 uint32_t src_w, uint32_t src_h)
1283 struct drm_atomic_state *state;
1284 struct drm_plane_state *plane_state;
1287 state = drm_atomic_state_alloc(plane->dev);
1291 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1293 plane_state = drm_atomic_get_plane_state(state, plane);
1294 if (IS_ERR(plane_state)) {
1295 ret = PTR_ERR(plane_state);
1299 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1302 drm_atomic_set_fb_for_plane(plane_state, fb);
1303 plane_state->crtc_x = crtc_x;
1304 plane_state->crtc_y = crtc_y;
1305 plane_state->crtc_h = crtc_h;
1306 plane_state->crtc_w = crtc_w;
1307 plane_state->src_x = src_x;
1308 plane_state->src_y = src_y;
1309 plane_state->src_h = src_h;
1310 plane_state->src_w = src_w;
1312 ret = drm_atomic_commit(state);
1316 if (plane == crtc->cursor)
1317 state->legacy_cursor_update = true;
1319 /* Driver takes ownership of state on successful commit. */
1322 if (ret == -EDEADLK)
1325 drm_atomic_state_free(state);
1329 drm_atomic_state_clear(state);
1330 drm_atomic_legacy_backoff(state);
1333 * Someone might have exchanged the framebuffer while we dropped locks
1334 * in the backoff code. We need to fix up the fb refcount tracking the
1337 plane->old_fb = plane->fb;
1341 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1344 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1345 * @plane: plane to disable
1347 * Provides a default plane disable handler using the atomic driver interface.
1350 * Zero on success, error code on failure
1352 int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1354 struct drm_atomic_state *state;
1355 struct drm_plane_state *plane_state;
1359 * FIXME: Without plane->crtc set we can't get at the implicit legacy
1360 * acquire context. The real fix will be to wire the acquire ctx through
1361 * everywhere we need it, but meanwhile prevent chaos by just skipping
1362 * this noop. The critical case is the cursor ioctls which a) only grab
1363 * crtc/cursor-plane locks (so we need the crtc to get at the right
1364 * acquire context) and b) can try to disable the plane multiple times.
1369 state = drm_atomic_state_alloc(plane->dev);
1373 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1375 plane_state = drm_atomic_get_plane_state(state, plane);
1376 if (IS_ERR(plane_state)) {
1377 ret = PTR_ERR(plane_state);
1381 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1384 drm_atomic_set_fb_for_plane(plane_state, NULL);
1385 plane_state->crtc_x = 0;
1386 plane_state->crtc_y = 0;
1387 plane_state->crtc_h = 0;
1388 plane_state->crtc_w = 0;
1389 plane_state->src_x = 0;
1390 plane_state->src_y = 0;
1391 plane_state->src_h = 0;
1392 plane_state->src_w = 0;
1394 if (plane == plane->crtc->cursor)
1395 state->legacy_cursor_update = true;
1397 ret = drm_atomic_commit(state);
1401 /* Driver takes ownership of state on successful commit. */
1404 if (ret == -EDEADLK)
1407 drm_atomic_state_free(state);
1411 drm_atomic_state_clear(state);
1412 drm_atomic_legacy_backoff(state);
1415 * Someone might have exchanged the framebuffer while we dropped locks
1416 * in the backoff code. We need to fix up the fb refcount tracking the
1419 plane->old_fb = plane->fb;
1423 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1425 static int update_output_state(struct drm_atomic_state *state,
1426 struct drm_mode_set *set)
1428 struct drm_device *dev = set->crtc->dev;
1429 struct drm_crtc *crtc;
1430 struct drm_crtc_state *crtc_state;
1431 struct drm_connector *connector;
1432 struct drm_connector_state *conn_state;
1435 ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1436 state->acquire_ctx);
1440 /* First grab all affected connector/crtc states. */
1441 for (i = 0; i < set->num_connectors; i++) {
1442 conn_state = drm_atomic_get_connector_state(state,
1443 set->connectors[i]);
1444 if (IS_ERR(conn_state))
1445 return PTR_ERR(conn_state);
1448 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1449 ret = drm_atomic_add_affected_connectors(state, crtc);
1454 /* Then recompute connector->crtc links and crtc enabling state. */
1455 for_each_connector_in_state(state, connector, conn_state, i) {
1456 if (conn_state->crtc == set->crtc) {
1457 ret = drm_atomic_set_crtc_for_connector(conn_state,
1463 for (j = 0; j < set->num_connectors; j++) {
1464 if (set->connectors[j] == connector) {
1465 ret = drm_atomic_set_crtc_for_connector(conn_state,
1474 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1475 /* Don't update ->enable for the CRTC in the set_config request,
1476 * since a mismatch would indicate a bug in the upper layers.
1477 * The actual modeset code later on will catch any
1478 * inconsistencies here. */
1479 if (crtc == set->crtc)
1482 crtc_state->enable =
1483 drm_atomic_connectors_for_crtc(state, crtc);
1490 * drm_atomic_helper_set_config - set a new config from userspace
1491 * @set: mode set configuration
1493 * Provides a default crtc set_config handler using the atomic driver interface.
1496 * Returns 0 on success, negative errno numbers on failure.
1498 int drm_atomic_helper_set_config(struct drm_mode_set *set)
1500 struct drm_atomic_state *state;
1501 struct drm_crtc *crtc = set->crtc;
1502 struct drm_crtc_state *crtc_state;
1503 struct drm_plane_state *primary_state;
1506 state = drm_atomic_state_alloc(crtc->dev);
1510 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1512 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1513 if (IS_ERR(crtc_state)) {
1514 ret = PTR_ERR(crtc_state);
1518 primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1519 if (IS_ERR(primary_state)) {
1520 ret = PTR_ERR(primary_state);
1526 WARN_ON(set->num_connectors);
1528 crtc_state->enable = false;
1529 crtc_state->active = false;
1531 ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1535 drm_atomic_set_fb_for_plane(primary_state, NULL);
1541 WARN_ON(!set->num_connectors);
1543 crtc_state->enable = true;
1544 crtc_state->active = true;
1545 drm_mode_copy(&crtc_state->mode, set->mode);
1547 ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1550 drm_atomic_set_fb_for_plane(primary_state, set->fb);
1551 primary_state->crtc_x = 0;
1552 primary_state->crtc_y = 0;
1553 primary_state->crtc_h = set->mode->vdisplay;
1554 primary_state->crtc_w = set->mode->hdisplay;
1555 primary_state->src_x = set->x << 16;
1556 primary_state->src_y = set->y << 16;
1557 primary_state->src_h = set->mode->vdisplay << 16;
1558 primary_state->src_w = set->mode->hdisplay << 16;
1561 ret = update_output_state(state, set);
1565 ret = drm_atomic_commit(state);
1569 /* Driver takes ownership of state on successful commit. */
1572 if (ret == -EDEADLK)
1575 drm_atomic_state_free(state);
1579 drm_atomic_state_clear(state);
1580 drm_atomic_legacy_backoff(state);
1583 * Someone might have exchanged the framebuffer while we dropped locks
1584 * in the backoff code. We need to fix up the fb refcount tracking the
1587 crtc->primary->old_fb = crtc->primary->fb;
1591 EXPORT_SYMBOL(drm_atomic_helper_set_config);
1594 * drm_atomic_helper_crtc_set_property - helper for crtc properties
1596 * @property: DRM property
1597 * @val: value of property
1599 * Provides a default crtc set_property handler using the atomic driver
1603 * Zero on success, error code on failure
1606 drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1607 struct drm_property *property,
1610 struct drm_atomic_state *state;
1611 struct drm_crtc_state *crtc_state;
1614 state = drm_atomic_state_alloc(crtc->dev);
1618 /* ->set_property is always called with all locks held. */
1619 state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1621 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1622 if (IS_ERR(crtc_state)) {
1623 ret = PTR_ERR(crtc_state);
1627 ret = drm_atomic_crtc_set_property(crtc, crtc_state,
1632 ret = drm_atomic_commit(state);
1636 /* Driver takes ownership of state on successful commit. */
1639 if (ret == -EDEADLK)
1642 drm_atomic_state_free(state);
1646 drm_atomic_state_clear(state);
1647 drm_atomic_legacy_backoff(state);
1651 EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1654 * drm_atomic_helper_plane_set_property - helper for plane properties
1656 * @property: DRM property
1657 * @val: value of property
1659 * Provides a default plane set_property handler using the atomic driver
1663 * Zero on success, error code on failure
1666 drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1667 struct drm_property *property,
1670 struct drm_atomic_state *state;
1671 struct drm_plane_state *plane_state;
1674 state = drm_atomic_state_alloc(plane->dev);
1678 /* ->set_property is always called with all locks held. */
1679 state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1681 plane_state = drm_atomic_get_plane_state(state, plane);
1682 if (IS_ERR(plane_state)) {
1683 ret = PTR_ERR(plane_state);
1687 ret = drm_atomic_plane_set_property(plane, plane_state,
1692 ret = drm_atomic_commit(state);
1696 /* Driver takes ownership of state on successful commit. */
1699 if (ret == -EDEADLK)
1702 drm_atomic_state_free(state);
1706 drm_atomic_state_clear(state);
1707 drm_atomic_legacy_backoff(state);
1711 EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1714 * drm_atomic_helper_connector_set_property - helper for connector properties
1715 * @connector: DRM connector
1716 * @property: DRM property
1717 * @val: value of property
1719 * Provides a default connector set_property handler using the atomic driver
1723 * Zero on success, error code on failure
1726 drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1727 struct drm_property *property,
1730 struct drm_atomic_state *state;
1731 struct drm_connector_state *connector_state;
1734 state = drm_atomic_state_alloc(connector->dev);
1738 /* ->set_property is always called with all locks held. */
1739 state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1741 connector_state = drm_atomic_get_connector_state(state, connector);
1742 if (IS_ERR(connector_state)) {
1743 ret = PTR_ERR(connector_state);
1747 ret = drm_atomic_connector_set_property(connector, connector_state,
1752 ret = drm_atomic_commit(state);
1756 /* Driver takes ownership of state on successful commit. */
1759 if (ret == -EDEADLK)
1762 drm_atomic_state_free(state);
1766 drm_atomic_state_clear(state);
1767 drm_atomic_legacy_backoff(state);
1771 EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
1774 * drm_atomic_helper_page_flip - execute a legacy page flip
1776 * @fb: DRM framebuffer
1777 * @event: optional DRM event to signal upon completion
1778 * @flags: flip flags for non-vblank sync'ed updates
1780 * Provides a default page flip implementation using the atomic driver interface.
1782 * Note that for now so called async page flips (i.e. updates which are not
1783 * synchronized to vblank) are not supported, since the atomic interfaces have
1784 * no provisions for this yet.
1787 * Returns 0 on success, negative errno numbers on failure.
1789 int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
1790 struct drm_framebuffer *fb,
1791 struct drm_pending_vblank_event *event,
1794 struct drm_plane *plane = crtc->primary;
1795 struct drm_atomic_state *state;
1796 struct drm_plane_state *plane_state;
1797 struct drm_crtc_state *crtc_state;
1800 if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
1803 state = drm_atomic_state_alloc(plane->dev);
1807 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1809 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1810 if (IS_ERR(crtc_state)) {
1811 ret = PTR_ERR(crtc_state);
1814 crtc_state->event = event;
1816 plane_state = drm_atomic_get_plane_state(state, plane);
1817 if (IS_ERR(plane_state)) {
1818 ret = PTR_ERR(plane_state);
1822 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1825 drm_atomic_set_fb_for_plane(plane_state, fb);
1827 ret = drm_atomic_async_commit(state);
1831 /* TODO: ->page_flip is the only driver callback where the core
1832 * doesn't update plane->fb. For now patch it up here. */
1833 plane->fb = plane->state->fb;
1835 /* Driver takes ownership of state on successful async commit. */
1838 if (ret == -EDEADLK)
1841 drm_atomic_state_free(state);
1845 drm_atomic_state_clear(state);
1846 drm_atomic_legacy_backoff(state);
1849 * Someone might have exchanged the framebuffer while we dropped locks
1850 * in the backoff code. We need to fix up the fb refcount tracking the
1853 plane->old_fb = plane->fb;
1857 EXPORT_SYMBOL(drm_atomic_helper_page_flip);
1860 * drm_atomic_helper_connector_dpms() - connector dpms helper implementation
1861 * @connector: affected connector
1864 * This is the main helper function provided by the atomic helper framework for
1865 * implementing the legacy DPMS connector interface. It computes the new desired
1866 * ->active state for the corresponding CRTC (if the connector is enabled) and
1869 void drm_atomic_helper_connector_dpms(struct drm_connector *connector,
1872 struct drm_mode_config *config = &connector->dev->mode_config;
1873 struct drm_atomic_state *state;
1874 struct drm_crtc_state *crtc_state;
1875 struct drm_crtc *crtc;
1876 struct drm_connector *tmp_connector;
1878 bool active = false;
1880 if (mode != DRM_MODE_DPMS_ON)
1881 mode = DRM_MODE_DPMS_OFF;
1883 connector->dpms = mode;
1884 crtc = connector->state->crtc;
1889 /* FIXME: ->dpms has no return value so can't forward the -ENOMEM. */
1890 state = drm_atomic_state_alloc(connector->dev);
1894 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1896 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1897 if (IS_ERR(crtc_state))
1900 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
1902 list_for_each_entry(tmp_connector, &config->connector_list, head) {
1903 if (tmp_connector->state->crtc != crtc)
1906 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
1911 crtc_state->active = active;
1913 ret = drm_atomic_commit(state);
1917 /* Driver takes ownership of state on successful async commit. */
1920 if (ret == -EDEADLK)
1923 drm_atomic_state_free(state);
1925 WARN(1, "Driver bug: Changing ->active failed with ret=%i\n", ret);
1929 drm_atomic_state_clear(state);
1930 drm_atomic_legacy_backoff(state);
1934 EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
1937 * DOC: atomic state reset and initialization
1939 * Both the drm core and the atomic helpers assume that there is always the full
1940 * and correct atomic software state for all connectors, CRTCs and planes
1941 * available. Which is a bit a problem on driver load and also after system
1942 * suspend. One way to solve this is to have a hardware state read-out
1943 * infrastructure which reconstructs the full software state (e.g. the i915
1946 * The simpler solution is to just reset the software state to everything off,
1947 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
1948 * the atomic helpers provide default reset implementations for all hooks.
1952 * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
1955 * Resets the atomic state for @crtc by freeing the state pointer (which might
1956 * be NULL, e.g. at driver load time) and allocating a new empty state object.
1958 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
1961 crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
1964 crtc->state->crtc = crtc;
1966 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
1969 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
1972 * Default CRTC state duplicate hook for drivers which don't have their own
1973 * subclassed CRTC state structure.
1975 struct drm_crtc_state *
1976 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
1978 struct drm_crtc_state *state;
1980 if (WARN_ON(!crtc->state))
1983 state = kmemdup(crtc->state, sizeof(*crtc->state), GFP_KERNEL);
1986 state->mode_changed = false;
1987 state->active_changed = false;
1988 state->planes_changed = false;
1989 state->event = NULL;
1994 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
1997 * drm_atomic_helper_crtc_destroy_state - default state destroy hook
1999 * @state: CRTC state object to release
2001 * Default CRTC state destroy hook for drivers which don't have their own
2002 * subclassed CRTC state structure.
2004 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
2005 struct drm_crtc_state *state)
2009 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
2012 * drm_atomic_helper_plane_reset - default ->reset hook for planes
2015 * Resets the atomic state for @plane by freeing the state pointer (which might
2016 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2018 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
2020 if (plane->state && plane->state->fb)
2021 drm_framebuffer_unreference(plane->state->fb);
2023 kfree(plane->state);
2024 plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
2027 plane->state->plane = plane;
2029 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
2032 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
2035 * Default plane state duplicate hook for drivers which don't have their own
2036 * subclassed plane state structure.
2038 struct drm_plane_state *
2039 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
2041 struct drm_plane_state *state;
2043 if (WARN_ON(!plane->state))
2046 state = kmemdup(plane->state, sizeof(*plane->state), GFP_KERNEL);
2048 if (state && state->fb)
2049 drm_framebuffer_reference(state->fb);
2053 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
2056 * drm_atomic_helper_plane_destroy_state - default state destroy hook
2058 * @state: plane state object to release
2060 * Default plane state destroy hook for drivers which don't have their own
2061 * subclassed plane state structure.
2063 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
2064 struct drm_plane_state *state)
2067 drm_framebuffer_unreference(state->fb);
2071 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
2074 * drm_atomic_helper_connector_reset - default ->reset hook for connectors
2075 * @connector: drm connector
2077 * Resets the atomic state for @connector by freeing the state pointer (which
2078 * might be NULL, e.g. at driver load time) and allocating a new empty state
2081 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
2083 kfree(connector->state);
2084 connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
2086 if (connector->state)
2087 connector->state->connector = connector;
2089 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
2092 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
2093 * @connector: drm connector
2095 * Default connector state duplicate hook for drivers which don't have their own
2096 * subclassed connector state structure.
2098 struct drm_connector_state *
2099 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
2101 if (WARN_ON(!connector->state))
2104 return kmemdup(connector->state, sizeof(*connector->state), GFP_KERNEL);
2106 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
2109 * drm_atomic_helper_connector_destroy_state - default state destroy hook
2110 * @connector: drm connector
2111 * @state: connector state object to release
2113 * Default connector state destroy hook for drivers which don't have their own
2114 * subclassed connector state structure.
2116 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
2117 struct drm_connector_state *state)
2121 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);