tree b0a265eb0ad15d2754e2f1b5435f5a16a0c629f8
parent 2701fc43562b55f5db0139ef6a7b13c2518ed6c0
author Kenneth Graunke <kenneth@whitecape.org> 1421182013 -0800
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1421467288 +0100

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>