On 06.04.2015 00:40, Chris Wilson wrote:
> Avoid adding to the waitqueue and reprobing the current vblank if the
> caller is only querying the current vblank sequence and timestamp and
> so we would return immediately.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Michel Dänzer <michel@xxxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>,
> Cc: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_irq.c | 18 ++++++++++--------
> 1 file changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 6f5dc18779e2..ba80b51b4b00 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -1617,14 +1617,16 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
> vblwait->request.sequence = seq + 1;
> }
>
> - DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
> - vblwait->request.sequence, crtc);
> - vblank->last_wait = vblwait->request.sequence;
> - DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> - (((drm_vblank_count(dev, crtc) -
> - vblwait->request.sequence) <= (1 << 23)) ||
> - !vblank->enabled ||
> - !dev->irq_enabled));
> + if (vblwait->request.sequence != seq) {
> + DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
> + vblwait->request.sequence, crtc);
> + vblank->last_wait = vblwait->request.sequence;
BTW, it looks like the last_wait field is unused and could be removed.
> + DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> + (((drm_vblank_count(dev, crtc) -
> + vblwait->request.sequence) <= (1 << 23)) ||
> + !vblank->enabled ||
> + !dev->irq_enabled));
> + }
>
> if (ret != -EINTR) {
> struct timeval now;
>
Also, the two patches should have different and more specific shortlogs.
But apart from that, this patch is
Reviewed-by: Michel Dänzer <michel.daenzer@xxxxxxx>
and the second patch is
Acked-by: Michel Dänzer <michel.daenzer@xxxxxxx>
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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