From: Kenneth Graunke <kenneth@whitecape.org>
Date: Tue, 13 Jan 2015 20:46:53 +0000 (-0800)
Subject: drm/i915: Ensure the HiZ RAW Stall Optimization is on for Cherryview.
X-Git-Tag: fixes-v4.0-rc1~91^2~32^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=973a5b06a096f1a9494ebe94c78d809459f4dc74;p=pandora-kernel.git

drm/i915: Ensure the HiZ RAW Stall Optimization is on for Cherryview.

This is an important optimization for avoiding read-after-write (RAW)
stalls in the HiZ buffer.  Certain workloads would run very slowly with
HiZ enabled, but run much faster with the "hiz=false" driconf option.
With this patch, they run at full speed even with HiZ.

Increases performance in OglVSInstancing by about 2.7x on Braswell.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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