diff options
| -rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 39 | ||||
| -rw-r--r-- | include/drm/drm_atomic.h | 4 |
2 files changed, 43 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index cd1b16b25716..3134f506b762 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -956,6 +956,45 @@ drm_atomic_add_affected_connectors(struct drm_atomic_state *state, EXPORT_SYMBOL(drm_atomic_add_affected_connectors); /** + * drm_atomic_add_affected_planes - add planes for crtc + * @state: atomic state + * @crtc: DRM crtc + * + * This function walks the current configuration and adds all planes + * currently used by @crtc to the atomic configuration @state. This is useful + * when an atomic commit also needs to check all currently enabled plane on + * @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC + * to avoid special code to force-enable all planes. + * + * Since acquiring a plane state will always also acquire the w/w mutex of the + * current CRTC for that plane (if there is any) adding all the plane states for + * a CRTC will not reduce parallism of atomic updates. + * + * Returns: + * 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK + * then the w/w mutex code has detected a deadlock and the entire atomic + * sequence must be restarted. All other errors are fatal. + */ +int +drm_atomic_add_affected_planes(struct drm_atomic_state *state, + struct drm_crtc *crtc) +{ + struct drm_plane *plane; + + WARN_ON(!drm_atomic_get_existing_crtc_state(state, crtc)); + + drm_for_each_plane_mask(plane, state->dev, crtc->state->plane_mask) { + struct drm_plane_state *plane_state = + drm_atomic_get_plane_state(state, plane); + + if (IS_ERR(plane_state)) + return PTR_ERR(plane_state); + } + return 0; +} +EXPORT_SYMBOL(drm_atomic_add_affected_planes); + +/** * drm_atomic_connectors_for_crtc - count number of connected outputs * @state: atomic state * @crtc: DRM crtc diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h index f0d3a7387d99..e89db0c377ba 100644 --- a/include/drm/drm_atomic.h +++ b/include/drm/drm_atomic.h @@ -120,6 +120,10 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state, int __must_check drm_atomic_add_affected_connectors(struct drm_atomic_state *state, struct drm_crtc *crtc); +int __must_check +drm_atomic_add_affected_planes(struct drm_atomic_state *state, + struct drm_crtc *crtc); + int drm_atomic_connectors_for_crtc(struct drm_atomic_state *state, struct drm_crtc *crtc); |