[Intel-gfx] [patch] [drm/i915] Fix up ring initialization to cover G45 oddities

[Keith Packard]

On Tue, 2008-10-14 at 20:54 -0700, Eric Anholt wrote:

> I'm not entirely sold on this patch (why do we have to do this, are we
> botching the ring setup somehow?), but it shouldn't hurt, so I pushed.

What I was seeing (fairly consistently, but not 100%) was that the value
written to RING_START would appear afterwards when reading RING_HEAD. I
can't explain that, it's contrary to the docs, and contrary to common
sense, but this patch 'fixes' that.

Voodoo programming ftw.

-- 
keith.packard at intel.com
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