[Intel-gfx] [PATCH] drm/i915: Don't wait for vblank for sprite plane flips

[Chris Wilson]

On Fri, Jun 28, 2013 at 05:24:50PM +0300, Ville Syrjälä wrote:
> On Fri, Jun 28, 2013 at 07:45:31PM +0530, Vijay Purushothaman wrote:
> > Since the sprite planes are using synchronized MMIO based flip, no need
> > to wait for vblank. Removing this wait allows us to get a nice
> > performance boost to both 3D & media workloads based on sprite (~60 fps
> > from ~20 fps)
> 
> Nak. We can't unpin the buffer until the hardware has finished reading
> from it.
> 
> The proper fix is to do the unpin asynchronously after the flip has
> completed. That's one part of the bigger atomic pageflip story.

The interested reader is invited to review the patches to do async
unpinning here and in set-base sent many, many moons ago.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre