From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 7 Aug 2014 14:39:54 +0000 (+0100)
Subject: drm/i915: Reset the HEAD pointer for the ring after writing START
X-Git-Tag: fixes-against-v3.18-rc2~73^2~32^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=95468892fdfeef6d1004b524e35957629efdbe00;p=pandora-kernel.git

drm/i915: Reset the HEAD pointer for the ring after writing START

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.

v2: Do the rewrite unconditionally anyway

References: https://bugs.freedesktop.org/show_bug.cgi?id=76554
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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