drm/i915:bxt: implement WaProgramL3SqcReg1DefaultForPerf
This patch applies a performance enhancement workaround based on analysis of DX and OCL S-Curve workloads. We increase the General Priority Credits for L3SQ from the hardware default of 56 to the max value 62, and decrease the High Priority credits from 8 to 2. v2: Only apply to B0 onwards v3: Move w/a to per engine init, ie bxt_init_workarounds Signed-off-by: Tim Gore <tim.gore@intel.com> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1461314761-36854-1-git-send-email-tim.gore@intel.com Reviewed-by: Michel Thierry <michel.thierry@intel.com>
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