[Intel-gfx] [PATCH] drm/i915: Don't do posting reads on getting forcewake

[Chris Wilson]

On Wed, Jan 28, 2015 at 03:25:05PM +0200, Mika Kuoppala wrote:
> The checking for ack and also any subsequent mmio access
> will serialize with setting the forcewake bit. Drop the
> posting read as superfluous.
> 
> Note that in the put side we still want to keep the posting read
> as it will ensure that the hw sees our forcewake release in a
> timely manner and doesn't keep the hw powered up.
> 
> Suggested-by: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre