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drm/atomic-helper: Set fence deadline for vblank

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For an atomic commit updating a single CRTC (ie. a pageflip) calculate
the next vblank time, and inform the fence(s) of that deadline.

v2: Comment typo fix (danvet)
v3: If there are multiple CRTCs, consider the time of the soonest vblank

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Rob Clark 2021-09-03 11:47:54 -07:00
parent b2c077d001
commit d39e48ca80
1 changed files with 37 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

37
drivers/gpu/drm/drm_atomic_helper.c
View file

@ -1511,6 +1511,41 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
/*
* For atomic updates which touch just a single CRTC, calculate the time of the
* next vblank, and inform all the fences of the deadline.
*/
static void set_fence_deadline(struct drm_device *dev,
struct drm_atomic_state *state)
{
struct drm_crtc *crtc;
struct drm_crtc_state *new_crtc_state;
struct drm_plane *plane;
struct drm_plane_state *new_plane_state;
ktime_t vbltime = 0;
int i;
for_each_new_crtc_in_state (state, crtc, new_crtc_state, i) {
ktime_t v;
if (drm_crtc_next_vblank_start(crtc, &v))
continue;
if (!vbltime || ktime_before(v, vbltime))
vbltime = v;
}
/* If no CRTCs updated, then nothing to do: */
if (!vbltime)
return;
for_each_new_plane_in_state (state, plane, new_plane_state, i) {
if (!new_plane_state->fence)
continue;
dma_fence_set_deadline(new_plane_state->fence, vbltime);
}
}
/**
* drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
* @dev: DRM device
@ -1540,6 +1575,8 @@ int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
struct drm_plane_state *new_plane_state;
int i, ret;
set_fence_deadline(dev, state);
for_each_new_plane_in_state(state, plane, new_plane_state, i) {
if (!new_plane_state->fence)
continue;