On Wed, Apr 15, 2015 at 09:17:02AM +0200, Daniel Vetter wrote:
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index c8a34476570a..23bfbc61a494 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -74,6 +74,33 @@ module_param_named(vblankoffdelay, drm_vblank_offdelay, int, 0600);
> module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600);
> module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
>
> +static void store_vblank(struct drm_device *dev, int crtc,
> + unsigned vblank_count_inc,
> + struct timeval *t_vblank)
> +{
> + struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
> + u32 tslot;
> +
> + assert_spin_locked(&dev->vblank_time_lock);
> +
> + if (t_vblank) {
> + tslot = vblank->count + vblank_count_inc;
> + vblanktimestamp(dev, crtc, tslot) = *t_vblank;
> + }
It is not obvious this updates the right tslot in all circumstances.
Care to explain?
Otherwise the rest looks consistent with seqlock, using the
vblank->count as the latch.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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