[Intel-gfx] [PATCH] drm/i915: allocate & enable MCHBAR if needed

Eric Anholt eric at anholt.net
Wed Apr 1 20:43:39 CEST 2009

On Tue, 2009-03-31 at 14:23 -0700, Jesse Barnes wrote:
> I noticed on my Eee 901 that the i915 DRM driver wasn't reading the
> MCHBAR reg at startup time, and so it would disable tiling.  For decent
> performance, especially on an Eee-like platform, tiling is a must.  So
> I put this patch together to allocate MCHBAR space and enable it if
> necessary.
> In combination with the pre-965 tiling patches in the tree now, you
> should see a big performance improvement if you have an affected
> machine.
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>

I've copied you on the clarification question I had for how to handle
the licensing.  There's still the problem that this will treat the
MCHBAR as 32 bits on G33 systems, while it's 64 bits there like the 965.
Also wondering what the IGD device is like.

Eric Anholt
eric at anholt.net                         eric.anholt at intel.com

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