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

Jesse Barnes jbarnes at virtuousgeek.org
Wed Apr 18 18:23:46 CEST 2012

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>

Jesse Barnes, Intel Open Source Technology Center

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