[Intel-gfx] [PATCH] drm/i915: Disable WC PTE updates to w/a buggy IOMMU on ILK

[Daniel Vetter]

On Wed, Feb 13, 2013 at 09:31:53AM +0000, Chris Wilson wrote:
> Whilst IOMMU is enabled for the Intel GPU on Ironlake, it appears that
> using WC writes to update the PTE on the GPU fail miserably. The result
> looks like the majority of the writes do not land leading to lots of
> screen corruption and a hard system hang.
> 
> v2: s/</<=/ to preserve the current exclusion of Sandybridge
> 
> Reported-by: Nathan Myers <ncm at cantrip.org>
> Bugzilla: https://bugzilla.freedesktop.org/show_bug.cgi?id=60391
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: stable at vger.kernel.org

Queued for -next with cc: stable removed, since the regression is only in
-next. Thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch