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

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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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Kenneth Graunke 2015-01-13 12:46:53 -08:00 • committed by Daniel Vetter

parent 2701fc4356

commit 973a5b06a0

1 changed files with 5 additions and 0 deletions

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drivers/gpu/drm/i915/intel_ringbuffer.c

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