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Commit e01e9f75 authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Daniel Vetter
Browse files

drm/atomic: add drm_atomic_add_affected_planes 



This is a convenience function to add all planes for a crtc,
similar to add_affected_connectors. This will be used in
drm_atomic_helper_check_modeset, but drivers can call it too
when they need to recalculate all state.

Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Amend kerneldoc a bit.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent de28d021

drivers/gpu/drm/drm_atomic.c

+39 −0
Original line number Diff line number Diff line
@@ -955,6 +955,45 @@ 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

include/drm/drm_atomic.h

+4 −0
Original line number Diff line number Diff line
@@ -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);