[Intel-gfx] [PATCH] drm/i915: Reset the HEAD pointer for the ring after writing START

[Chris Wilson]

On Thu, Aug 07, 2014 at 03:11:17PM +0100, Chris Wilson wrote:
> Ville found an old w/a documented for g4x that suggested that we need to
> reset the HEAD after writing START. This is a useful fixup for some of
> the g4x ring initialisation woes, but as usual, not all.

Note that a slightly different form of this patch has been used by the
reporters of bug76584 without much sucess. (My gm45 works with the old
patch - it prints out the debugging information that the fudge was
applied.))
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre