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drm/atomic: add commit_planes_on_crtc helper

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drm_atomic_helper_commit_planes calls all atomic_begin's first,
then updates all planes, finally calling atomic_flush.

Some drivers may want to things like disabling irq's
from their atomic_begin, in which case a second call to atomic_begin
will splat. By using commit_planes_on_crtc on each crtc in the
atomic state they'll evade that issue.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
[danvet: Extend kerneldoc a bit as discussed with Maarten on irc.]
[danvet: Squash in fixup to check for crtc_funcs in all places.
Reported by Dan Carpenter.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2015-05-19 16:41:01 +02:00 committed by Daniel Vetter
parent bdcddf95e8
commit de28d0212a
2 changed files with 63 additions and 0 deletions
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62
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -1127,6 +1127,10 @@ EXPORT_SYMBOL(drm_atomic_helper_prepare_planes);
*
* It still requires the global state object @old_state to know which planes and
* crtcs need to be updated though.
*
* Note that this function does all plane updates across all CRTCs in one step.
* If the hardware can't support this approach look at
* drm_atomic_helper_commit_planes_on_crtc() instead.
*/
void drm_atomic_helper_commit_planes(struct drm_device *dev,
struct drm_atomic_state *old_state)
@ -1180,6 +1184,64 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_atomic_helper_commit_planes);
/**
* drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc
* @old_crtc_state: atomic state object with the old crtc state
*
* This function commits the new plane state using the plane and atomic helper
* functions for planes on the specific crtc. It assumes that the atomic state
* has already been pushed into the relevant object state pointers, since this
* step can no longer fail.
*
* This function is useful when plane updates should be done crtc-by-crtc
* instead of one global step like drm_atomic_helper_commit_planes() does.
*
* This function can only be savely used when planes are not allowed to move
* between different CRTCs because this function doesn't handle inter-CRTC
* depencies. Callers need to ensure that either no such depencies exist,
* resolve them through ordering of commit calls or through some other means.
*/
void
drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state)
{
const struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_crtc *crtc = old_crtc_state->crtc;
struct drm_atomic_state *old_state = old_crtc_state->state;
struct drm_plane *plane;
unsigned plane_mask;
plane_mask = old_crtc_state->plane_mask;
plane_mask |= crtc->state->plane_mask;
crtc_funcs = crtc->helper_private;
if (crtc_funcs && crtc_funcs->atomic_begin)
crtc_funcs->atomic_begin(crtc);
drm_for_each_plane_mask(plane, crtc->dev, plane_mask) {
struct drm_plane_state *old_plane_state =
drm_atomic_get_existing_plane_state(old_state, plane);
const struct drm_plane_helper_funcs *plane_funcs;
plane_funcs = plane->helper_private;
if (!old_plane_state || !plane_funcs)
continue;
WARN_ON(plane->state->crtc && plane->state->crtc != crtc);
if (drm_atomic_plane_disabling(plane, old_plane_state) &&
plane_funcs->atomic_disable)
plane_funcs->atomic_disable(plane, old_plane_state);
else if (plane->state->crtc ||
drm_atomic_plane_disabling(plane, old_plane_state))
plane_funcs->atomic_update(plane, old_plane_state);
}
if (crtc_funcs && crtc_funcs->atomic_flush)
crtc_funcs->atomic_flush(crtc);
}
EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
/**
* drm_atomic_helper_cleanup_planes - cleanup plane resources after commit
* @dev: DRM device

1
include/drm/drm_atomic_helper.h
View File

@ -58,6 +58,7 @@ void drm_atomic_helper_commit_planes(struct drm_device *dev,
struct drm_atomic_state *state);
void drm_atomic_helper_cleanup_planes(struct drm_device *dev,
struct drm_atomic_state *old_state);
void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state);
void drm_atomic_helper_swap_state(struct drm_device *dev,
struct drm_atomic_state *state);