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 --- drivers/gpu/drm/drm_irq.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index ca5ef87c57c1..866cf58a36c5 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1710,7 +1710,7 @@ 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); @@ -1738,14 +1738,16 @@ int drm_wait_vblank(struct drm_device *dev, void *data, vblwait->request.sequence = seq + 1; }
- DRM_DEBUG("waiting on vblank count %d, crtc %u\n", - vblwait->request.sequence, pipe); - vblank->last_wait = vblwait->request.sequence; - DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, - (((drm_vblank_count(dev, pipe) - - vblwait->request.sequence) <= (1 << 23)) || - !vblank->enabled || - !dev->irq_enabled)); + if (vblwait->request.sequence != seq) { + DRM_DEBUG("waiting on vblank count %d, crtc %u\n", + vblwait->request.sequence, pipe); + vblank->last_wait = vblwait->request.sequence; + DRM_WAIT_ON(ret, vblank->queue, 3 * HZ, + (((drm_vblank_count(dev, pipe) - + vblwait->request.sequence) <= (1 << 23)) || + !vblank->enabled || + !dev->irq_enabled)); + }
if (ret != -EINTR) { struct timeval now; @@ -1754,10 +1756,10 @@ 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 %d to client\n", - vblwait->reply.sequence); + DRM_DEBUG("crtc %d returning %d 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: