[Intel-gfx] [PATCH] drm/i915/sprite: Avoid incurring extra vblank stall when updating plane on IVB

[Daniel Vetter]

On Wed, Apr 18, 2012 at 09:23:46AM -0700, Jesse Barnes wrote:
> On Wed, 18 Apr 2012 17:12:26 +0100
> Chris Wilson <chris at chris-wilson.co.uk> wrote:
> 
> > IvyBridge requires an extra frame between disabling the low power
> > watermarks and enabling scaling on the sprite plane. If the scaling
> > is already enabled, then we have already disabled the low power
> > watermarks and need not incur an extra wait.
> > 
> > Similarly, as we disable the scaling when turning off the sprite plane,
> > we can update the scaling enabled flag and restore the low power
> > watermarks.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Jesse Barnes <jbarnes at virtuousgeek.org>
> > ---
> 
> Yep, this is a good optimization.
> 
> Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>
Queued for -next, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
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