On Mon, May 26, 2014 at 02:46:26PM +0300, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Clearing the timestamps causes us to send zeroed timestamps to userspace
> if they get sent out in response to the drm_vblank_off(). It's better
> to send the very latest timestamp and count instead.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Do we have a kms_flip testcase which hunts for this? I guess a vblank
event with a vblank sufficiently far into the future would be useful.
Maybe call it vblank_cancel-vs-* or so. Besides the lack of testcase the
patch is Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/drm_irq.c | 11 -----------
> 1 file changed, 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 7b1e08c..6fa7474 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -56,14 +56,6 @@
> #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
>
> /*
> - * Clear vblank timestamp buffer for a crtc.
> - */
> -static void clear_vblank_timestamps(struct drm_device *dev, int crtc)
> -{
> - memset(dev->vblank[crtc].time, 0, sizeof(dev->vblank[crtc].time));
> -}
> -
> -/*
> * Disable vblank irq's on crtc, make sure that last vblank count
> * of hardware and corresponding consistent software vblank counter
> * are preserved, even if there are any spurious vblank irq's after
> @@ -131,9 +123,6 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
> smp_mb__after_atomic_inc();
> }
>
> - /* Invalidate all timestamps while vblank irq's are off. */
> - clear_vblank_timestamps(dev, crtc);
> -
> spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
> }
>
> --
> 1.8.5.5
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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