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drm: Skip the waitqueue setup for vblank queries 

Avoid adding to the waitqueue and reprobing the current vblank if the
caller is only querying the current vblank sequence and timestamp, where
we know that the wait would return immediately.

v2: Add CRTC identifier to debug messages

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Michel Dänzer <michel@daenzer.net>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Dave Airlie <airlied@redhat.com>,
Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Michel Dänzer <michel@daenzer.net>
Reviewed-and-tested-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170315204027.20160-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-03-15 20:40:26 +00:00 committed by Daniel Vetter
parent 608b205069
commit 82c8e025b5
1 changed files with 13 additions and 11 deletions
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10
drivers/gpu/drm/drm_irq.c
View File

@ -1610,7 +1610,7 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
ret = drm_vblank_get(dev, pipe);
if (ret) {
DRM_DEBUG("failed to acquire vblank counter, %d\n", ret);
DRM_DEBUG("crtc %d failed to acquire vblank counter, %d\n", pipe, ret);
return ret;
}
seq = drm_vblank_count(dev, pipe);
@ -1638,6 +1638,7 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
return drm_queue_vblank_event(dev, pipe, vblwait, file_priv);
}
if (vblwait->request.sequence != seq) {
DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
vblwait->request.sequence, pipe);
DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
@ -1645,6 +1646,7 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
vblwait->request.sequence) <= (1 << 23)) ||
!vblank->enabled ||
!dev->irq_enabled));
}
if (ret != -EINTR) {
struct timeval now;
@ -1653,10 +1655,10 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
vblwait->reply.tval_sec = now.tv_sec;
vblwait->reply.tval_usec = now.tv_usec;
DRM_DEBUG("returning %u to client\n",
vblwait->reply.sequence);
DRM_DEBUG("crtc %d returning %u to client\n",
pipe, vblwait->reply.sequence);
} else {
DRM_DEBUG("vblank wait interrupted by signal\n");
DRM_DEBUG("crtc %d vblank wait interrupted by signal\n", pipe);
}
done: