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;
200 if (funcs->atomic_best_encoder)
201 new_encoder = funcs->atomic_best_encoder(connector,
204 new_encoder = funcs->best_encoder(connector);
207 DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n",
213 if (new_encoder == connector_state->best_encoder) {
214 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d]\n",
217 new_encoder->base.id,
219 connector_state->crtc->base.id);
224 encoder_crtc = get_current_crtc_for_encoder(state->dev,
228 ret = steal_encoder(state, new_encoder, encoder_crtc);
230 DRM_DEBUG_ATOMIC("Encoder stealing failed for [CONNECTOR:%d:%s]\n",
237 if (WARN_ON(!connector_state->crtc))
240 connector_state->best_encoder = new_encoder;
241 idx = drm_crtc_index(connector_state->crtc);
243 crtc_state = state->crtc_states[idx];
244 crtc_state->mode_changed = true;
246 DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d]\n",
249 new_encoder->base.id,
251 connector_state->crtc->base.id);
257 mode_fixup(struct drm_atomic_state *state)
259 struct drm_crtc *crtc;
260 struct drm_crtc_state *crtc_state;
261 struct drm_connector *connector;
262 struct drm_connector_state *conn_state;
266 for_each_crtc_in_state(state, crtc, crtc_state, i) {
267 if (!crtc_state->mode_changed)
270 drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode);
273 for_each_connector_in_state(state, connector, conn_state, i) {
274 const struct drm_encoder_helper_funcs *funcs;
275 struct drm_encoder *encoder;
277 WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc);
279 if (!conn_state->crtc || !conn_state->best_encoder)
283 state->crtc_states[drm_crtc_index(conn_state->crtc)];
286 * Each encoder has at most one connector (since we always steal
287 * it away), so we won't call ->mode_fixup twice.
289 encoder = conn_state->best_encoder;
290 funcs = encoder->helper_private;
294 ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode,
295 &crtc_state->adjusted_mode);
297 DRM_DEBUG_ATOMIC("Bridge fixup failed\n");
301 if (funcs->atomic_check) {
302 ret = funcs->atomic_check(encoder, crtc_state,
305 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n",
306 encoder->base.id, encoder->name);
310 ret = funcs->mode_fixup(encoder, &crtc_state->mode,
311 &crtc_state->adjusted_mode);
313 DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n",
314 encoder->base.id, encoder->name);
320 for_each_crtc_in_state(state, crtc, crtc_state, i) {
321 const struct drm_crtc_helper_funcs *funcs;
323 if (!crtc_state->mode_changed)
326 funcs = crtc->helper_private;
327 if (!funcs->mode_fixup)
330 ret = funcs->mode_fixup(crtc, &crtc_state->mode,
331 &crtc_state->adjusted_mode);
333 DRM_DEBUG_ATOMIC("[CRTC:%d] fixup failed\n",
343 * drm_atomic_helper_check_modeset - validate state object for modeset changes
345 * @state: the driver state object
347 * Check the state object to see if the requested state is physically possible.
348 * This does all the crtc and connector related computations for an atomic
349 * update. It computes and updates crtc_state->mode_changed, adds any additional
350 * connectors needed for full modesets and calls down into ->mode_fixup
351 * functions of the driver backend.
355 * Drivers which update ->mode_changed (e.g. in their ->atomic_check hooks if a
356 * plane update can't be done without a full modeset) _must_ call this function
357 * afterwards after that change. It is permitted to call this function multiple
358 * times for the same update, e.g. when the ->atomic_check functions depend upon
359 * the adjusted dotclock for fifo space allocation and watermark computation.
362 * Zero for success or -errno
365 drm_atomic_helper_check_modeset(struct drm_device *dev,
366 struct drm_atomic_state *state)
368 struct drm_crtc *crtc;
369 struct drm_crtc_state *crtc_state;
370 struct drm_connector *connector;
371 struct drm_connector_state *connector_state;
374 for_each_crtc_in_state(state, crtc, crtc_state, i) {
375 if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) {
376 DRM_DEBUG_ATOMIC("[CRTC:%d] mode changed\n",
378 crtc_state->mode_changed = true;
381 if (crtc->state->enable != crtc_state->enable) {
382 DRM_DEBUG_ATOMIC("[CRTC:%d] enable changed\n",
384 crtc_state->mode_changed = true;
388 for_each_connector_in_state(state, connector, connector_state, i) {
390 * This only sets crtc->mode_changed for routing changes,
391 * drivers must set crtc->mode_changed themselves when connector
392 * properties need to be updated.
394 ret = update_connector_routing(state, i);
400 * After all the routing has been prepared we need to add in any
401 * connector which is itself unchanged, but who's crtc changes it's
402 * configuration. This must be done before calling mode_fixup in case a
403 * crtc only changed its mode but has the same set of connectors.
405 for_each_crtc_in_state(state, crtc, crtc_state, i) {
409 * We must set ->active_changed after walking connectors for
410 * otherwise an update that only changes active would result in
411 * a full modeset because update_connector_routing force that.
413 if (crtc->state->active != crtc_state->active) {
414 DRM_DEBUG_ATOMIC("[CRTC:%d] active changed\n",
416 crtc_state->active_changed = true;
419 if (!drm_atomic_crtc_needs_modeset(crtc_state))
422 DRM_DEBUG_ATOMIC("[CRTC:%d] needs all connectors, enable: %c, active: %c\n",
424 crtc_state->enable ? 'y' : 'n',
425 crtc_state->active ? 'y' : 'n');
427 ret = drm_atomic_add_affected_connectors(state, crtc);
431 ret = drm_atomic_add_affected_planes(state, crtc);
435 num_connectors = drm_atomic_connectors_for_crtc(state,
438 if (crtc_state->enable != !!num_connectors) {
439 DRM_DEBUG_ATOMIC("[CRTC:%d] enabled/connectors mismatch\n",
446 return mode_fixup(state);
448 EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
451 * drm_atomic_helper_check_planes - validate state object for planes changes
453 * @state: the driver state object
455 * Check the state object to see if the requested state is physically possible.
456 * This does all the plane update related checks using by calling into the
457 * ->atomic_check hooks provided by the driver.
460 * Zero for success or -errno
463 drm_atomic_helper_check_planes(struct drm_device *dev,
464 struct drm_atomic_state *state)
466 struct drm_crtc *crtc;
467 struct drm_crtc_state *crtc_state;
468 struct drm_plane *plane;
469 struct drm_plane_state *plane_state;
472 for_each_plane_in_state(state, plane, plane_state, i) {
473 const struct drm_plane_helper_funcs *funcs;
475 funcs = plane->helper_private;
477 drm_atomic_helper_plane_changed(state, plane_state, plane);
479 if (!funcs || !funcs->atomic_check)
482 ret = funcs->atomic_check(plane, plane_state);
484 DRM_DEBUG_ATOMIC("[PLANE:%d] atomic driver check failed\n",
490 for_each_crtc_in_state(state, crtc, crtc_state, i) {
491 const struct drm_crtc_helper_funcs *funcs;
493 funcs = crtc->helper_private;
495 if (!funcs || !funcs->atomic_check)
498 ret = funcs->atomic_check(crtc, state->crtc_states[i]);
500 DRM_DEBUG_ATOMIC("[CRTC:%d] atomic driver check failed\n",
508 EXPORT_SYMBOL(drm_atomic_helper_check_planes);
511 * drm_atomic_helper_check - validate state object
513 * @state: the driver state object
515 * Check the state object to see if the requested state is physically possible.
516 * Only crtcs and planes have check callbacks, so for any additional (global)
517 * checking that a driver needs it can simply wrap that around this function.
518 * Drivers without such needs can directly use this as their ->atomic_check()
521 * This just wraps the two parts of the state checking for planes and modeset
522 * state in the default order: First it calls drm_atomic_helper_check_modeset()
523 * and then drm_atomic_helper_check_planes(). The assumption is that the
524 * ->atomic_check functions depend upon an updated adjusted_mode.clock to
525 * e.g. properly compute watermarks.
528 * Zero for success or -errno
530 int drm_atomic_helper_check(struct drm_device *dev,
531 struct drm_atomic_state *state)
535 ret = drm_atomic_helper_check_modeset(dev, state);
539 ret = drm_atomic_helper_check_planes(dev, state);
545 EXPORT_SYMBOL(drm_atomic_helper_check);
548 disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
550 struct drm_connector *connector;
551 struct drm_connector_state *old_conn_state;
552 struct drm_crtc *crtc;
553 struct drm_crtc_state *old_crtc_state;
556 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
557 const struct drm_encoder_helper_funcs *funcs;
558 struct drm_encoder *encoder;
559 struct drm_crtc_state *old_crtc_state;
561 /* Shut down everything that's in the changeset and currently
562 * still on. So need to check the old, saved state. */
563 if (!old_conn_state->crtc)
566 old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
568 if (!old_crtc_state->active ||
569 !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
572 encoder = old_conn_state->best_encoder;
574 /* We shouldn't get this far if we didn't previously have
575 * an encoder.. but WARN_ON() rather than explode.
577 if (WARN_ON(!encoder))
580 funcs = encoder->helper_private;
582 DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
583 encoder->base.id, encoder->name);
586 * Each encoder has at most one connector (since we always steal
587 * it away), so we won't call disable hooks twice.
589 drm_bridge_disable(encoder->bridge);
591 /* Right function depends upon target state. */
592 if (connector->state->crtc && funcs->prepare)
593 funcs->prepare(encoder);
594 else if (funcs->disable)
595 funcs->disable(encoder);
597 funcs->dpms(encoder, DRM_MODE_DPMS_OFF);
599 drm_bridge_post_disable(encoder->bridge);
602 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
603 const struct drm_crtc_helper_funcs *funcs;
605 /* Shut down everything that needs a full modeset. */
606 if (!drm_atomic_crtc_needs_modeset(crtc->state))
609 if (!old_crtc_state->active)
612 funcs = crtc->helper_private;
614 DRM_DEBUG_ATOMIC("disabling [CRTC:%d]\n",
618 /* Right function depends upon target state. */
619 if (crtc->state->enable && funcs->prepare)
620 funcs->prepare(crtc);
621 else if (funcs->disable)
622 funcs->disable(crtc);
624 funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
629 * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state
631 * @old_state: atomic state object with old state structures
633 * This function updates all the various legacy modeset state pointers in
634 * connectors, encoders and crtcs. It also updates the timestamping constants
635 * used for precise vblank timestamps by calling
636 * drm_calc_timestamping_constants().
638 * Drivers can use this for building their own atomic commit if they don't have
639 * a pure helper-based modeset implementation.
642 drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
643 struct drm_atomic_state *old_state)
645 struct drm_connector *connector;
646 struct drm_connector_state *old_conn_state;
647 struct drm_crtc *crtc;
648 struct drm_crtc_state *old_crtc_state;
651 /* clear out existing links */
652 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
653 if (!connector->encoder)
656 WARN_ON(!connector->encoder->crtc);
658 connector->encoder->crtc = NULL;
659 connector->encoder = NULL;
663 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
664 if (!connector->state->crtc)
667 if (WARN_ON(!connector->state->best_encoder))
670 connector->encoder = connector->state->best_encoder;
671 connector->encoder->crtc = connector->state->crtc;
674 /* set legacy state in the crtc structure */
675 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
676 crtc->mode = crtc->state->mode;
677 crtc->enabled = crtc->state->enable;
678 crtc->x = crtc->primary->state->src_x >> 16;
679 crtc->y = crtc->primary->state->src_y >> 16;
681 if (crtc->state->enable)
682 drm_calc_timestamping_constants(crtc,
683 &crtc->state->adjusted_mode);
686 EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
689 crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state)
691 struct drm_crtc *crtc;
692 struct drm_crtc_state *old_crtc_state;
693 struct drm_connector *connector;
694 struct drm_connector_state *old_conn_state;
697 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
698 const struct drm_crtc_helper_funcs *funcs;
700 if (!crtc->state->mode_changed)
703 funcs = crtc->helper_private;
705 if (crtc->state->enable && funcs->mode_set_nofb) {
706 DRM_DEBUG_ATOMIC("modeset on [CRTC:%d]\n",
709 funcs->mode_set_nofb(crtc);
713 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
714 const struct drm_encoder_helper_funcs *funcs;
715 struct drm_crtc_state *new_crtc_state;
716 struct drm_encoder *encoder;
717 struct drm_display_mode *mode, *adjusted_mode;
719 if (!connector->state->best_encoder)
722 encoder = connector->state->best_encoder;
723 funcs = encoder->helper_private;
724 new_crtc_state = connector->state->crtc->state;
725 mode = &new_crtc_state->mode;
726 adjusted_mode = &new_crtc_state->adjusted_mode;
728 if (!new_crtc_state->mode_changed)
731 DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n",
732 encoder->base.id, encoder->name);
735 * Each encoder has at most one connector (since we always steal
736 * it away), so we won't call mode_set hooks twice.
739 funcs->mode_set(encoder, mode, adjusted_mode);
741 drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode);
746 * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs
748 * @old_state: atomic state object with old state structures
750 * This function shuts down all the outputs that need to be shut down and
751 * prepares them (if required) with the new mode.
753 * For compatability with legacy crtc helpers this should be called before
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_disables(struct drm_device *dev,
760 struct drm_atomic_state *old_state)
762 disable_outputs(dev, old_state);
764 drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
766 crtc_set_mode(dev, old_state);
768 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables);
771 * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs
773 * @old_state: atomic state object with old state structures
775 * This function enables all the outputs with the new configuration which had to
776 * be turned off for the update.
778 * For compatability with legacy crtc helpers this should be called after
779 * drm_atomic_helper_commit_planes(), which is what the default commit function
780 * does. But drivers with different needs can group the modeset commits together
781 * and do the plane commits at the end. This is useful for drivers doing runtime
782 * PM since planes updates then only happen when the CRTC is actually enabled.
784 void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
785 struct drm_atomic_state *old_state)
787 struct drm_crtc *crtc;
788 struct drm_crtc_state *old_crtc_state;
789 struct drm_connector *connector;
790 struct drm_connector_state *old_conn_state;
793 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
794 const struct drm_crtc_helper_funcs *funcs;
796 /* Need to filter out CRTCs where only planes change. */
797 if (!drm_atomic_crtc_needs_modeset(crtc->state))
800 if (!crtc->state->active)
803 funcs = crtc->helper_private;
805 if (crtc->state->enable) {
806 DRM_DEBUG_ATOMIC("enabling [CRTC:%d]\n",
816 for_each_connector_in_state(old_state, connector, old_conn_state, i) {
817 const struct drm_encoder_helper_funcs *funcs;
818 struct drm_encoder *encoder;
820 if (!connector->state->best_encoder)
823 if (!connector->state->crtc->state->active ||
824 !drm_atomic_crtc_needs_modeset(connector->state->crtc->state))
827 encoder = connector->state->best_encoder;
828 funcs = encoder->helper_private;
830 DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n",
831 encoder->base.id, encoder->name);
834 * Each encoder has at most one connector (since we always steal
835 * it away), so we won't call enable hooks twice.
837 drm_bridge_pre_enable(encoder->bridge);
840 funcs->enable(encoder);
842 funcs->commit(encoder);
844 drm_bridge_enable(encoder->bridge);
847 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
849 static void wait_for_fences(struct drm_device *dev,
850 struct drm_atomic_state *state)
852 struct drm_plane *plane;
853 struct drm_plane_state *plane_state;
856 for_each_plane_in_state(state, plane, plane_state, i) {
857 if (!plane->state->fence)
860 WARN_ON(!plane->state->fb);
862 fence_wait(plane->state->fence, false);
863 fence_put(plane->state->fence);
864 plane->state->fence = NULL;
868 static bool framebuffer_changed(struct drm_device *dev,
869 struct drm_atomic_state *old_state,
870 struct drm_crtc *crtc)
872 struct drm_plane *plane;
873 struct drm_plane_state *old_plane_state;
876 for_each_plane_in_state(old_state, plane, old_plane_state, i) {
877 if (plane->state->crtc != crtc &&
878 old_plane_state->crtc != crtc)
881 if (plane->state->fb != old_plane_state->fb)
889 * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
891 * @old_state: atomic state object with old state structures
893 * Helper to, after atomic commit, wait for vblanks on all effected
894 * crtcs (ie. before cleaning up old framebuffers using
895 * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
896 * framebuffers have actually changed to optimize for the legacy cursor and
897 * plane update use-case.
900 drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
901 struct drm_atomic_state *old_state)
903 struct drm_crtc *crtc;
904 struct drm_crtc_state *old_crtc_state;
907 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
908 /* No one cares about the old state, so abuse it for tracking
909 * and store whether we hold a vblank reference (and should do a
910 * vblank wait) in the ->enable boolean. */
911 old_crtc_state->enable = false;
913 if (!crtc->state->enable)
916 /* Legacy cursor ioctls are completely unsynced, and userspace
917 * relies on that (by doing tons of cursor updates). */
918 if (old_state->legacy_cursor_update)
921 if (!framebuffer_changed(dev, old_state, crtc))
924 ret = drm_crtc_vblank_get(crtc);
928 old_crtc_state->enable = true;
929 old_crtc_state->last_vblank_count = drm_vblank_count(dev, i);
932 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
933 if (!old_crtc_state->enable)
936 ret = wait_event_timeout(dev->vblank[i].queue,
937 old_crtc_state->last_vblank_count !=
938 drm_vblank_count(dev, i),
939 msecs_to_jiffies(50));
941 drm_crtc_vblank_put(crtc);
944 EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
947 * drm_atomic_helper_commit - commit validated state object
949 * @state: the driver state object
950 * @async: asynchronous commit
952 * This function commits a with drm_atomic_helper_check() pre-validated state
953 * object. This can still fail when e.g. the framebuffer reservation fails. For
954 * now this doesn't implement asynchronous commits.
957 * Zero for success or -errno.
959 int drm_atomic_helper_commit(struct drm_device *dev,
960 struct drm_atomic_state *state,
968 ret = drm_atomic_helper_prepare_planes(dev, state);
973 * This is the point of no return - everything below never fails except
974 * when the hw goes bonghits. Which means we can commit the new state on
975 * the software side now.
978 drm_atomic_helper_swap_state(dev, state);
981 * Everything below can be run asynchronously without the need to grab
982 * any modeset locks at all under one condition: It must be guaranteed
983 * that the asynchronous work has either been cancelled (if the driver
984 * supports it, which at least requires that the framebuffers get
985 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
986 * before the new state gets committed on the software side with
987 * drm_atomic_helper_swap_state().
989 * This scheme allows new atomic state updates to be prepared and
990 * checked in parallel to the asynchronous completion of the previous
991 * update. Which is important since compositors need to figure out the
992 * composition of the next frame right after having submitted the
996 wait_for_fences(dev, state);
998 drm_atomic_helper_commit_modeset_disables(dev, state);
1000 drm_atomic_helper_commit_planes(dev, state);
1002 drm_atomic_helper_commit_modeset_enables(dev, state);
1004 drm_atomic_helper_wait_for_vblanks(dev, state);
1006 drm_atomic_helper_cleanup_planes(dev, state);
1008 drm_atomic_state_free(state);
1012 EXPORT_SYMBOL(drm_atomic_helper_commit);
1015 * DOC: implementing async commit
1017 * For now the atomic helpers don't support async commit directly. If there is
1018 * real need it could be added though, using the dma-buf fence infrastructure
1019 * for generic synchronization with outstanding rendering.
1021 * For now drivers have to implement async commit themselves, with the following
1022 * sequence being the recommended one:
1024 * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function
1025 * which commit needs to call which can fail, so we want to run it first and
1028 * 2. Synchronize with any outstanding asynchronous commit worker threads which
1029 * might be affected the new state update. This can be done by either cancelling
1030 * or flushing the work items, depending upon whether the driver can deal with
1031 * cancelled updates. Note that it is important to ensure that the framebuffer
1032 * cleanup is still done when cancelling.
1034 * For sufficient parallelism it is recommended to have a work item per crtc
1035 * (for updates which don't touch global state) and a global one. Then we only
1036 * need to synchronize with the crtc work items for changed crtcs and the global
1037 * work item, which allows nice concurrent updates on disjoint sets of crtcs.
1039 * 3. The software state is updated synchronously with
1040 * drm_atomic_helper_swap_state. Doing this under the protection of all modeset
1041 * locks means concurrent callers never see inconsistent state. And doing this
1042 * while it's guaranteed that no relevant async worker runs means that async
1043 * workers do not need grab any locks. Actually they must not grab locks, for
1044 * otherwise the work flushing will deadlock.
1046 * 4. Schedule a work item to do all subsequent steps, using the split-out
1047 * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and
1048 * then cleaning up the framebuffers after the old framebuffer is no longer
1053 * drm_atomic_helper_prepare_planes - prepare plane resources before commit
1055 * @state: atomic state object with new state structures
1057 * This function prepares plane state, specifically framebuffers, for the new
1058 * configuration. If any failure is encountered this function will call
1059 * ->cleanup_fb on any already successfully prepared framebuffer.
1062 * 0 on success, negative error code on failure.
1064 int drm_atomic_helper_prepare_planes(struct drm_device *dev,
1065 struct drm_atomic_state *state)
1067 int nplanes = dev->mode_config.num_total_plane;
1070 for (i = 0; i < nplanes; 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 = plane_state->fb;
1083 if (fb && funcs->prepare_fb) {
1084 ret = funcs->prepare_fb(plane, fb, plane_state);
1093 for (i--; i >= 0; i--) {
1094 const struct drm_plane_helper_funcs *funcs;
1095 struct drm_plane *plane = state->planes[i];
1096 struct drm_plane_state *plane_state = state->plane_states[i];
1097 struct drm_framebuffer *fb;
1102 funcs = plane->helper_private;
1104 fb = state->plane_states[i]->fb;
1106 if (fb && funcs->cleanup_fb)
1107 funcs->cleanup_fb(plane, fb, plane_state);
1113 EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
1116 * drm_atomic_helper_commit_planes - commit plane state
1118 * @old_state: atomic state object with old state structures
1120 * This function commits the new plane state using the plane and atomic helper
1121 * functions for planes and crtcs. It assumes that the atomic state has already
1122 * been pushed into the relevant object state pointers, since this step can no
1125 * It still requires the global state object @old_state to know which planes and
1126 * crtcs need to be updated though.
1128 * Note that this function does all plane updates across all CRTCs in one step.
1129 * If the hardware can't support this approach look at
1130 * drm_atomic_helper_commit_planes_on_crtc() instead.
1132 void drm_atomic_helper_commit_planes(struct drm_device *dev,
1133 struct drm_atomic_state *old_state)
1135 struct drm_crtc *crtc;
1136 struct drm_crtc_state *old_crtc_state;
1137 struct drm_plane *plane;
1138 struct drm_plane_state *old_plane_state;
1141 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1142 const struct drm_crtc_helper_funcs *funcs;
1144 funcs = crtc->helper_private;
1146 if (!funcs || !funcs->atomic_begin)
1149 funcs->atomic_begin(crtc);
1152 for_each_plane_in_state(old_state, plane, old_plane_state, i) {
1153 const struct drm_plane_helper_funcs *funcs;
1155 funcs = plane->helper_private;
1161 * Special-case disabling the plane if drivers support it.
1163 if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1164 funcs->atomic_disable)
1165 funcs->atomic_disable(plane, old_plane_state);
1166 else if (plane->state->crtc ||
1167 drm_atomic_plane_disabling(plane, old_plane_state))
1168 funcs->atomic_update(plane, old_plane_state);
1171 for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) {
1172 const struct drm_crtc_helper_funcs *funcs;
1174 funcs = crtc->helper_private;
1176 if (!funcs || !funcs->atomic_flush)
1179 funcs->atomic_flush(crtc);
1182 EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
1185 * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc
1186 * @old_crtc_state: atomic state object with the old crtc state
1188 * This function commits the new plane state using the plane and atomic helper
1189 * functions for planes on the specific crtc. It assumes that the atomic state
1190 * has already been pushed into the relevant object state pointers, since this
1191 * step can no longer fail.
1193 * This function is useful when plane updates should be done crtc-by-crtc
1194 * instead of one global step like drm_atomic_helper_commit_planes() does.
1196 * This function can only be savely used when planes are not allowed to move
1197 * between different CRTCs because this function doesn't handle inter-CRTC
1198 * depencies. Callers need to ensure that either no such depencies exist,
1199 * resolve them through ordering of commit calls or through some other means.
1202 drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
1204 const struct drm_crtc_helper_funcs *crtc_funcs;
1205 struct drm_crtc *crtc = old_crtc_state->crtc;
1206 struct drm_atomic_state *old_state = old_crtc_state->state;
1207 struct drm_plane *plane;
1208 unsigned plane_mask;
1210 plane_mask = old_crtc_state->plane_mask;
1211 plane_mask |= crtc->state->plane_mask;
1213 crtc_funcs = crtc->helper_private;
1214 if (crtc_funcs && crtc_funcs->atomic_begin)
1215 crtc_funcs->atomic_begin(crtc);
1217 drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
1218 struct drm_plane_state *old_plane_state =
1219 drm_atomic_get_existing_plane_state(old_state, plane);
1220 const struct drm_plane_helper_funcs *plane_funcs;
1222 plane_funcs = plane->helper_private;
1224 if (!old_plane_state || !plane_funcs)
1227 WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
1229 if (drm_atomic_plane_disabling(plane, old_plane_state) &&
1230 plane_funcs->atomic_disable)
1231 plane_funcs->atomic_disable(plane, old_plane_state);
1232 else if (plane->state->crtc ||
1233 drm_atomic_plane_disabling(plane, old_plane_state))
1234 plane_funcs->atomic_update(plane, old_plane_state);
1237 if (crtc_funcs && crtc_funcs->atomic_flush)
1238 crtc_funcs->atomic_flush(crtc);
1240 EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
1243 * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
1245 * @old_state: atomic state object with old state structures
1247 * This function cleans up plane state, specifically framebuffers, from the old
1248 * configuration. Hence the old configuration must be perserved in @old_state to
1249 * be able to call this function.
1251 * This function must also be called on the new state when the atomic update
1252 * fails at any point after calling drm_atomic_helper_prepare_planes().
1254 void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
1255 struct drm_atomic_state *old_state)
1257 struct drm_plane *plane;
1258 struct drm_plane_state *plane_state;
1261 for_each_plane_in_state(old_state, plane, plane_state, i) {
1262 const struct drm_plane_helper_funcs *funcs;
1263 struct drm_framebuffer *old_fb;
1265 funcs = plane->helper_private;
1267 old_fb = plane_state->fb;
1269 if (old_fb && funcs->cleanup_fb)
1270 funcs->cleanup_fb(plane, old_fb, plane_state);
1273 EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
1276 * drm_atomic_helper_swap_state - store atomic state into current sw state
1278 * @state: atomic state
1280 * This function stores the atomic state into the current state pointers in all
1281 * driver objects. It should be called after all failing steps have been done
1282 * and succeeded, but before the actual hardware state is committed.
1284 * For cleanup and error recovery the current state for all changed objects will
1285 * be swaped into @state.
1287 * With that sequence it fits perfectly into the plane prepare/cleanup sequence:
1289 * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state.
1291 * 2. Do any other steps that might fail.
1293 * 3. Put the staged state into the current state pointers with this function.
1295 * 4. Actually commit the hardware state.
1297 * 5. Call drm_atomic_helper_cleanup_planes with @state, which since step 3
1298 * contains the old state. Also do any other cleanup required with that state.
1300 void drm_atomic_helper_swap_state(struct drm_device *dev,
1301 struct drm_atomic_state *state)
1305 for (i = 0; i < dev->mode_config.num_connector; i++) {
1306 struct drm_connector *connector = state->connectors[i];
1311 connector->state->state = state;
1312 swap(state->connector_states[i], connector->state);
1313 connector->state->state = NULL;
1316 for (i = 0; i < dev->mode_config.num_crtc; i++) {
1317 struct drm_crtc *crtc = state->crtcs[i];
1322 crtc->state->state = state;
1323 swap(state->crtc_states[i], crtc->state);
1324 crtc->state->state = NULL;
1327 for (i = 0; i < dev->mode_config.num_total_plane; i++) {
1328 struct drm_plane *plane = state->planes[i];
1333 plane->state->state = state;
1334 swap(state->plane_states[i], plane->state);
1335 plane->state->state = NULL;
1338 EXPORT_SYMBOL(drm_atomic_helper_swap_state);
1341 * drm_atomic_helper_update_plane - Helper for primary plane update using atomic
1342 * @plane: plane object to update
1343 * @crtc: owning CRTC of owning plane
1344 * @fb: framebuffer to flip onto plane
1345 * @crtc_x: x offset of primary plane on crtc
1346 * @crtc_y: y offset of primary plane on crtc
1347 * @crtc_w: width of primary plane rectangle on crtc
1348 * @crtc_h: height of primary plane rectangle on crtc
1349 * @src_x: x offset of @fb for panning
1350 * @src_y: y offset of @fb for panning
1351 * @src_w: width of source rectangle in @fb
1352 * @src_h: height of source rectangle in @fb
1354 * Provides a default plane update handler using the atomic driver interface.
1357 * Zero on success, error code on failure
1359 int drm_atomic_helper_update_plane(struct drm_plane *plane,
1360 struct drm_crtc *crtc,
1361 struct drm_framebuffer *fb,
1362 int crtc_x, int crtc_y,
1363 unsigned int crtc_w, unsigned int crtc_h,
1364 uint32_t src_x, uint32_t src_y,
1365 uint32_t src_w, uint32_t src_h)
1367 struct drm_atomic_state *state;
1368 struct drm_plane_state *plane_state;
1371 state = drm_atomic_state_alloc(plane->dev);
1375 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1377 plane_state = drm_atomic_get_plane_state(state, plane);
1378 if (IS_ERR(plane_state)) {
1379 ret = PTR_ERR(plane_state);
1383 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1386 drm_atomic_set_fb_for_plane(plane_state, fb);
1387 plane_state->crtc_x = crtc_x;
1388 plane_state->crtc_y = crtc_y;
1389 plane_state->crtc_h = crtc_h;
1390 plane_state->crtc_w = crtc_w;
1391 plane_state->src_x = src_x;
1392 plane_state->src_y = src_y;
1393 plane_state->src_h = src_h;
1394 plane_state->src_w = src_w;
1396 if (plane == crtc->cursor)
1397 state->legacy_cursor_update = true;
1399 ret = drm_atomic_commit(state);
1403 /* Driver takes ownership of state on successful commit. */
1406 if (ret == -EDEADLK)
1409 drm_atomic_state_free(state);
1413 drm_atomic_state_clear(state);
1414 drm_atomic_legacy_backoff(state);
1417 * Someone might have exchanged the framebuffer while we dropped locks
1418 * in the backoff code. We need to fix up the fb refcount tracking the
1421 plane->old_fb = plane->fb;
1425 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
1428 * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic
1429 * @plane: plane to disable
1431 * Provides a default plane disable handler using the atomic driver interface.
1434 * Zero on success, error code on failure
1436 int drm_atomic_helper_disable_plane(struct drm_plane *plane)
1438 struct drm_atomic_state *state;
1439 struct drm_plane_state *plane_state;
1443 * FIXME: Without plane->crtc set we can't get at the implicit legacy
1444 * acquire context. The real fix will be to wire the acquire ctx through
1445 * everywhere we need it, but meanwhile prevent chaos by just skipping
1446 * this noop. The critical case is the cursor ioctls which a) only grab
1447 * crtc/cursor-plane locks (so we need the crtc to get at the right
1448 * acquire context) and b) can try to disable the plane multiple times.
1453 state = drm_atomic_state_alloc(plane->dev);
1457 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
1459 plane_state = drm_atomic_get_plane_state(state, plane);
1460 if (IS_ERR(plane_state)) {
1461 ret = PTR_ERR(plane_state);
1465 ret = drm_atomic_set_crtc_for_plane(plane_state, NULL);
1468 drm_atomic_set_fb_for_plane(plane_state, NULL);
1469 plane_state->crtc_x = 0;
1470 plane_state->crtc_y = 0;
1471 plane_state->crtc_h = 0;
1472 plane_state->crtc_w = 0;
1473 plane_state->src_x = 0;
1474 plane_state->src_y = 0;
1475 plane_state->src_h = 0;
1476 plane_state->src_w = 0;
1478 if (plane == plane->crtc->cursor)
1479 state->legacy_cursor_update = true;
1481 ret = drm_atomic_commit(state);
1485 /* Driver takes ownership of state on successful commit. */
1488 if (ret == -EDEADLK)
1491 drm_atomic_state_free(state);
1495 drm_atomic_state_clear(state);
1496 drm_atomic_legacy_backoff(state);
1499 * Someone might have exchanged the framebuffer while we dropped locks
1500 * in the backoff code. We need to fix up the fb refcount tracking the
1503 plane->old_fb = plane->fb;
1507 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
1509 static int update_output_state(struct drm_atomic_state *state,
1510 struct drm_mode_set *set)
1512 struct drm_device *dev = set->crtc->dev;
1513 struct drm_crtc *crtc;
1514 struct drm_crtc_state *crtc_state;
1515 struct drm_connector *connector;
1516 struct drm_connector_state *conn_state;
1519 ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
1520 state->acquire_ctx);
1524 /* First grab all affected connector/crtc states. */
1525 for (i = 0; i < set->num_connectors; i++) {
1526 conn_state = drm_atomic_get_connector_state(state,
1527 set->connectors[i]);
1528 if (IS_ERR(conn_state))
1529 return PTR_ERR(conn_state);
1532 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1533 ret = drm_atomic_add_affected_connectors(state, crtc);
1538 /* Then recompute connector->crtc links and crtc enabling state. */
1539 for_each_connector_in_state(state, connector, conn_state, i) {
1540 if (conn_state->crtc == set->crtc) {
1541 ret = drm_atomic_set_crtc_for_connector(conn_state,
1547 for (j = 0; j < set->num_connectors; j++) {
1548 if (set->connectors[j] == connector) {
1549 ret = drm_atomic_set_crtc_for_connector(conn_state,
1558 for_each_crtc_in_state(state, crtc, crtc_state, i) {
1559 /* Don't update ->enable for the CRTC in the set_config request,
1560 * since a mismatch would indicate a bug in the upper layers.
1561 * The actual modeset code later on will catch any
1562 * inconsistencies here. */
1563 if (crtc == set->crtc)
1566 if (!drm_atomic_connectors_for_crtc(state, crtc)) {
1567 ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
1572 crtc_state->active = false;
1580 * drm_atomic_helper_set_config - set a new config from userspace
1581 * @set: mode set configuration
1583 * Provides a default crtc set_config handler using the atomic driver interface.
1586 * Returns 0 on success, negative errno numbers on failure.
1588 int drm_atomic_helper_set_config(struct drm_mode_set *set)
1590 struct drm_atomic_state *state;
1591 struct drm_crtc *crtc = set->crtc;
1592 struct drm_crtc_state *crtc_state;
1593 struct drm_plane_state *primary_state;
1596 state = drm_atomic_state_alloc(crtc->dev);
1600 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1602 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1603 if (IS_ERR(crtc_state)) {
1604 ret = PTR_ERR(crtc_state);
1608 primary_state = drm_atomic_get_plane_state(state, crtc->primary);
1609 if (IS_ERR(primary_state)) {
1610 ret = PTR_ERR(primary_state);
1616 WARN_ON(set->num_connectors);
1618 ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
1622 crtc_state->active = false;
1624 ret = drm_atomic_set_crtc_for_plane(primary_state, NULL);
1628 drm_atomic_set_fb_for_plane(primary_state, NULL);
1634 WARN_ON(!set->num_connectors);
1636 ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
1640 crtc_state->active = true;
1642 ret = drm_atomic_set_crtc_for_plane(primary_state, crtc);
1645 drm_atomic_set_fb_for_plane(primary_state, set->fb);
1646 primary_state->crtc_x = 0;
1647 primary_state->crtc_y = 0;
1648 primary_state->crtc_h = set->mode->vdisplay;
1649 primary_state->crtc_w = set->mode->hdisplay;
1650 primary_state->src_x = set->x << 16;
1651 primary_state->src_y = set->y << 16;
1652 primary_state->src_h = set->mode->vdisplay << 16;
1653 primary_state->src_w = set->mode->hdisplay << 16;
1656 ret = update_output_state(state, set);
1660 ret = drm_atomic_commit(state);
1664 /* Driver takes ownership of state on successful commit. */
1667 if (ret == -EDEADLK)
1670 drm_atomic_state_free(state);
1674 drm_atomic_state_clear(state);
1675 drm_atomic_legacy_backoff(state);
1678 * Someone might have exchanged the framebuffer while we dropped locks
1679 * in the backoff code. We need to fix up the fb refcount tracking the
1682 crtc->primary->old_fb = crtc->primary->fb;
1686 EXPORT_SYMBOL(drm_atomic_helper_set_config);
1689 * drm_atomic_helper_crtc_set_property - helper for crtc properties
1691 * @property: DRM property
1692 * @val: value of property
1694 * Provides a default crtc set_property handler using the atomic driver
1698 * Zero on success, error code on failure
1701 drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc,
1702 struct drm_property *property,
1705 struct drm_atomic_state *state;
1706 struct drm_crtc_state *crtc_state;
1709 state = drm_atomic_state_alloc(crtc->dev);
1713 /* ->set_property is always called with all locks held. */
1714 state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
1716 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1717 if (IS_ERR(crtc_state)) {
1718 ret = PTR_ERR(crtc_state);
1722 ret = drm_atomic_crtc_set_property(crtc, crtc_state,
1727 ret = drm_atomic_commit(state);
1731 /* Driver takes ownership of state on successful commit. */
1734 if (ret == -EDEADLK)
1737 drm_atomic_state_free(state);
1741 drm_atomic_state_clear(state);
1742 drm_atomic_legacy_backoff(state);
1746 EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property);
1749 * drm_atomic_helper_plane_set_property - helper for plane properties
1751 * @property: DRM property
1752 * @val: value of property
1754 * Provides a default plane set_property handler using the atomic driver
1758 * Zero on success, error code on failure
1761 drm_atomic_helper_plane_set_property(struct drm_plane *plane,
1762 struct drm_property *property,
1765 struct drm_atomic_state *state;
1766 struct drm_plane_state *plane_state;
1769 state = drm_atomic_state_alloc(plane->dev);
1773 /* ->set_property is always called with all locks held. */
1774 state->acquire_ctx = plane->dev->mode_config.acquire_ctx;
1776 plane_state = drm_atomic_get_plane_state(state, plane);
1777 if (IS_ERR(plane_state)) {
1778 ret = PTR_ERR(plane_state);
1782 ret = drm_atomic_plane_set_property(plane, plane_state,
1787 ret = drm_atomic_commit(state);
1791 /* Driver takes ownership of state on successful commit. */
1794 if (ret == -EDEADLK)
1797 drm_atomic_state_free(state);
1801 drm_atomic_state_clear(state);
1802 drm_atomic_legacy_backoff(state);
1806 EXPORT_SYMBOL(drm_atomic_helper_plane_set_property);
1809 * drm_atomic_helper_connector_set_property - helper for connector properties
1810 * @connector: DRM connector
1811 * @property: DRM property
1812 * @val: value of property
1814 * Provides a default connector set_property handler using the atomic driver
1818 * Zero on success, error code on failure
1821 drm_atomic_helper_connector_set_property(struct drm_connector *connector,
1822 struct drm_property *property,
1825 struct drm_atomic_state *state;
1826 struct drm_connector_state *connector_state;
1829 state = drm_atomic_state_alloc(connector->dev);
1833 /* ->set_property is always called with all locks held. */
1834 state->acquire_ctx = connector->dev->mode_config.acquire_ctx;
1836 connector_state = drm_atomic_get_connector_state(state, connector);
1837 if (IS_ERR(connector_state)) {
1838 ret = PTR_ERR(connector_state);
1842 ret = drm_atomic_connector_set_property(connector, connector_state,
1847 ret = drm_atomic_commit(state);
1851 /* Driver takes ownership of state on successful commit. */
1854 if (ret == -EDEADLK)
1857 drm_atomic_state_free(state);
1861 drm_atomic_state_clear(state);
1862 drm_atomic_legacy_backoff(state);
1866 EXPORT_SYMBOL(drm_atomic_helper_connector_set_property);
1869 * drm_atomic_helper_page_flip - execute a legacy page flip
1871 * @fb: DRM framebuffer
1872 * @event: optional DRM event to signal upon completion
1873 * @flags: flip flags for non-vblank sync'ed updates
1875 * Provides a default page flip implementation using the atomic driver interface.
1877 * Note that for now so called async page flips (i.e. updates which are not
1878 * synchronized to vblank) are not supported, since the atomic interfaces have
1879 * no provisions for this yet.
1882 * Returns 0 on success, negative errno numbers on failure.
1884 int drm_atomic_helper_page_flip(struct drm_crtc *crtc,
1885 struct drm_framebuffer *fb,
1886 struct drm_pending_vblank_event *event,
1889 struct drm_plane *plane = crtc->primary;
1890 struct drm_atomic_state *state;
1891 struct drm_plane_state *plane_state;
1892 struct drm_crtc_state *crtc_state;
1895 if (flags & DRM_MODE_PAGE_FLIP_ASYNC)
1898 state = drm_atomic_state_alloc(plane->dev);
1902 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1904 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1905 if (IS_ERR(crtc_state)) {
1906 ret = PTR_ERR(crtc_state);
1909 crtc_state->event = event;
1911 plane_state = drm_atomic_get_plane_state(state, plane);
1912 if (IS_ERR(plane_state)) {
1913 ret = PTR_ERR(plane_state);
1917 ret = drm_atomic_set_crtc_for_plane(plane_state, crtc);
1920 drm_atomic_set_fb_for_plane(plane_state, fb);
1922 ret = drm_atomic_async_commit(state);
1926 /* TODO: ->page_flip is the only driver callback where the core
1927 * doesn't update plane->fb. For now patch it up here. */
1928 plane->fb = plane->state->fb;
1930 /* Driver takes ownership of state on successful async commit. */
1933 if (ret == -EDEADLK)
1936 drm_atomic_state_free(state);
1940 drm_atomic_state_clear(state);
1941 drm_atomic_legacy_backoff(state);
1944 * Someone might have exchanged the framebuffer while we dropped locks
1945 * in the backoff code. We need to fix up the fb refcount tracking the
1948 plane->old_fb = plane->fb;
1952 EXPORT_SYMBOL(drm_atomic_helper_page_flip);
1955 * drm_atomic_helper_connector_dpms() - connector dpms helper implementation
1956 * @connector: affected connector
1959 * This is the main helper function provided by the atomic helper framework for
1960 * implementing the legacy DPMS connector interface. It computes the new desired
1961 * ->active state for the corresponding CRTC (if the connector is enabled) and
1964 void drm_atomic_helper_connector_dpms(struct drm_connector *connector,
1967 struct drm_mode_config *config = &connector->dev->mode_config;
1968 struct drm_atomic_state *state;
1969 struct drm_crtc_state *crtc_state;
1970 struct drm_crtc *crtc;
1971 struct drm_connector *tmp_connector;
1973 bool active = false;
1975 if (mode != DRM_MODE_DPMS_ON)
1976 mode = DRM_MODE_DPMS_OFF;
1978 connector->dpms = mode;
1979 crtc = connector->state->crtc;
1984 /* FIXME: ->dpms has no return value so can't forward the -ENOMEM. */
1985 state = drm_atomic_state_alloc(connector->dev);
1989 state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
1991 crtc_state = drm_atomic_get_crtc_state(state, crtc);
1992 if (IS_ERR(crtc_state))
1995 WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
1997 list_for_each_entry(tmp_connector, &config->connector_list, head) {
1998 if (tmp_connector->state->crtc != crtc)
2001 if (tmp_connector->dpms == DRM_MODE_DPMS_ON) {
2006 crtc_state->active = active;
2008 ret = drm_atomic_commit(state);
2012 /* Driver takes ownership of state on successful async commit. */
2015 if (ret == -EDEADLK)
2018 drm_atomic_state_free(state);
2020 WARN(1, "Driver bug: Changing ->active failed with ret=%i\n", ret);
2024 drm_atomic_state_clear(state);
2025 drm_atomic_legacy_backoff(state);
2029 EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
2032 * DOC: atomic state reset and initialization
2034 * Both the drm core and the atomic helpers assume that there is always the full
2035 * and correct atomic software state for all connectors, CRTCs and planes
2036 * available. Which is a bit a problem on driver load and also after system
2037 * suspend. One way to solve this is to have a hardware state read-out
2038 * infrastructure which reconstructs the full software state (e.g. the i915
2041 * The simpler solution is to just reset the software state to everything off,
2042 * which is easiest to do by calling drm_mode_config_reset(). To facilitate this
2043 * the atomic helpers provide default reset implementations for all hooks.
2047 * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
2050 * Resets the atomic state for @crtc by freeing the state pointer (which might
2051 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2053 void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
2055 if (crtc->state && crtc->state->mode_blob)
2056 drm_property_unreference_blob(crtc->state->mode_blob);
2058 crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
2061 crtc->state->crtc = crtc;
2063 EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
2066 * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
2067 * @crtc: CRTC object
2068 * @state: atomic CRTC state
2070 * Copies atomic state from a CRTC's current state and resets inferred values.
2071 * This is useful for drivers that subclass the CRTC state.
2073 void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
2074 struct drm_crtc_state *state)
2076 memcpy(state, crtc->state, sizeof(*state));
2078 if (state->mode_blob)
2079 drm_property_reference_blob(state->mode_blob);
2080 state->mode_changed = false;
2081 state->active_changed = false;
2082 state->planes_changed = false;
2083 state->event = NULL;
2085 EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
2088 * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
2091 * Default CRTC state duplicate hook for drivers which don't have their own
2092 * subclassed CRTC state structure.
2094 struct drm_crtc_state *
2095 drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
2097 struct drm_crtc_state *state;
2099 if (WARN_ON(!crtc->state))
2102 state = kmalloc(sizeof(*state), GFP_KERNEL);
2104 __drm_atomic_helper_crtc_duplicate_state(crtc, state);
2108 EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
2111 * __drm_atomic_helper_crtc_destroy_state - release CRTC state
2112 * @crtc: CRTC object
2113 * @state: CRTC state object to release
2115 * Releases all resources stored in the CRTC state without actually freeing
2116 * the memory of the CRTC state. This is useful for drivers that subclass the
2119 void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
2120 struct drm_crtc_state *state)
2122 if (state->mode_blob)
2123 drm_property_unreference_blob(state->mode_blob);
2125 EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
2128 * drm_atomic_helper_crtc_destroy_state - default state destroy hook
2130 * @state: CRTC state object to release
2132 * Default CRTC state destroy hook for drivers which don't have their own
2133 * subclassed CRTC state structure.
2135 void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
2136 struct drm_crtc_state *state)
2138 __drm_atomic_helper_crtc_destroy_state(crtc, state);
2141 EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
2144 * drm_atomic_helper_plane_reset - default ->reset hook for planes
2147 * Resets the atomic state for @plane by freeing the state pointer (which might
2148 * be NULL, e.g. at driver load time) and allocating a new empty state object.
2150 void drm_atomic_helper_plane_reset(struct drm_plane *plane)
2152 if (plane->state && plane->state->fb)
2153 drm_framebuffer_unreference(plane->state->fb);
2155 kfree(plane->state);
2156 plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
2159 plane->state->plane = plane;
2161 EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
2164 * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
2165 * @plane: plane object
2166 * @state: atomic plane state
2168 * Copies atomic state from a plane's current state. This is useful for
2169 * drivers that subclass the plane state.
2171 void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
2172 struct drm_plane_state *state)
2174 memcpy(state, plane->state, sizeof(*state));
2177 drm_framebuffer_reference(state->fb);
2179 EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
2182 * drm_atomic_helper_plane_duplicate_state - default state duplicate hook
2185 * Default plane state duplicate hook for drivers which don't have their own
2186 * subclassed plane state structure.
2188 struct drm_plane_state *
2189 drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
2191 struct drm_plane_state *state;
2193 if (WARN_ON(!plane->state))
2196 state = kmalloc(sizeof(*state), GFP_KERNEL);
2198 __drm_atomic_helper_plane_duplicate_state(plane, state);
2202 EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
2205 * __drm_atomic_helper_plane_destroy_state - release plane state
2206 * @plane: plane object
2207 * @state: plane state object to release
2209 * Releases all resources stored in the plane state without actually freeing
2210 * the memory of the plane state. This is useful for drivers that subclass the
2213 void __drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
2214 struct drm_plane_state *state)
2217 drm_framebuffer_unreference(state->fb);
2219 EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
2222 * drm_atomic_helper_plane_destroy_state - default state destroy hook
2224 * @state: plane state object to release
2226 * Default plane state destroy hook for drivers which don't have their own
2227 * subclassed plane state structure.
2229 void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
2230 struct drm_plane_state *state)
2232 __drm_atomic_helper_plane_destroy_state(plane, state);
2235 EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
2238 * drm_atomic_helper_connector_reset - default ->reset hook for connectors
2239 * @connector: drm connector
2241 * Resets the atomic state for @connector by freeing the state pointer (which
2242 * might be NULL, e.g. at driver load time) and allocating a new empty state
2245 void drm_atomic_helper_connector_reset(struct drm_connector *connector)
2247 kfree(connector->state);
2248 connector->state = kzalloc(sizeof(*connector->state), GFP_KERNEL);
2250 if (connector->state)
2251 connector->state->connector = connector;
2253 EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
2256 * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
2257 * @connector: connector object
2258 * @state: atomic connector state
2260 * Copies atomic state from a connector's current state. This is useful for
2261 * drivers that subclass the connector state.
2264 __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
2265 struct drm_connector_state *state)
2267 memcpy(state, connector->state, sizeof(*state));
2269 EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
2272 * drm_atomic_helper_connector_duplicate_state - default state duplicate hook
2273 * @connector: drm connector
2275 * Default connector state duplicate hook for drivers which don't have their own
2276 * subclassed connector state structure.
2278 struct drm_connector_state *
2279 drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
2281 struct drm_connector_state *state;
2283 if (WARN_ON(!connector->state))
2286 state = kmalloc(sizeof(*state), GFP_KERNEL);
2288 __drm_atomic_helper_connector_duplicate_state(connector, state);
2292 EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
2295 * __drm_atomic_helper_connector_destroy_state - release connector state
2296 * @connector: connector object
2297 * @state: connector state object to release
2299 * Releases all resources stored in the connector state without actually
2300 * freeing the memory of the connector state. This is useful for drivers that
2301 * subclass the connector state.
2304 __drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
2305 struct drm_connector_state *state)
2308 * This is currently a placeholder so that drivers that subclass the
2309 * state will automatically do the right thing if code is ever added
2313 EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
2316 * drm_atomic_helper_connector_destroy_state - default state destroy hook
2317 * @connector: drm connector
2318 * @state: connector state object to release
2320 * Default connector state destroy hook for drivers which don't have their own
2321 * subclassed connector state structure.
2323 void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
2324 struct drm_connector_state *state)
2326 __drm_atomic_helper_connector_destroy_state(connector, state);
2329 EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);