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author | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2015-05-19 14:41:02 (GMT) |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-05-21 08:29:07 (GMT) |
commit | e01e9f75a0c4e6cdbf1f139e37e9161408e49b7c (patch) | |
tree | 7de1442d2cfa68763e3d943b07018a06f31b8cda /drivers/gpu/drm/drm_atomic.c | |
parent | de28d0212a3ea7b92a9795cd0e5bfc7d15214677 (diff) | |
download | linux-e01e9f75a0c4e6cdbf1f139e37e9161408e49b7c.tar.xz |
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: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Amend kerneldoc a bit.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_atomic.c')
-rw-r--r-- | drivers/gpu/drm/drm_atomic.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index cd1b16b..3134f50 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 |