[Intel-gfx] [PATCH] UXA: Wait until a pageflip actually completes to report it.

[Chris Wilson]

On Mon, May 05, 2014 at 11:05:07PM -0700, Jamey Sharp wrote:
> UXA was reporting page-flip completion as soon as the flip was scheduled
> with the kernel, instead of waiting for the kernel to indicate that the
> flip had actually completed.
> 
> Moving the DRI2SwapComplete call to the right place fixes all of our
> Piglit tests for OML_sync_control when run on xf86-video-intel/UXA,
> aside from a bit of difficult-to-reproduce flakiness when using a
> divisor > 1.

The violation is intentional, as it gives us triple buffering by
default. It can be disabled. Also you could do an improved version for
recent Xorg, still using DRI2.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre