[Intel-gfx] [PATCH] drm/i915: support low power watermarks on Ironlake

[Chris Wilson]

On Thu, 23 Dec 2010 08:14:22 -0800, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> I wonder if the PAT code is somehow failing to set up WC pages on
> resume?

Indeed it appears to be.

Tearing down and recreating the gtt_mapping across suspend restores the
expected behaviour.

Now to understand if the x86 pagetable code is actually meant to restore
those flags on resume...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre