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drm/i915: enable HiZ Raw Stall Optimization on HSW

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The optimization is available on Ivy Bridge and later, and is disabled by
default.  Enabling it helps certain workloads such as GLBenchmark TRex test.

No piglit regression.

v2
 - no need to save the register before suspend as init_clock_gating can
   correctly program it after resume
 - split IVB change to another commit

Signed-off-by: Chia-I Wu <olv@lunarg.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chia-I Wu 2014-01-28 13:29:33 +08:00 committed by Daniel Vetter
parent 6c7a01ec37
commit fe27c60662
2 changed files with 6 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -935,6 +935,8 @@
#define ECO_GATING_CX_ONLY (1<<3)
#define ECO_FLIP_DONE (1<<0)
#define CACHE_MODE_0_GEN7 0x7000 /* IVB+ */
#define HIZ_RAW_STALL_OPT_DISABLE (1<<2)
#define CACHE_MODE_1 0x7004 /* IVB+ */
#define PIXEL_SUBSPAN_COLLECT_OPT_DISABLE (1<<6)

4
drivers/gpu/drm/i915/intel_pm.c
View File

@ -4785,6 +4785,10 @@ static void haswell_init_clock_gating(struct drm_device *dev)
I915_WRITE(GEN7_FF_THREAD_MODE,
I915_READ(GEN7_FF_THREAD_MODE) & ~GEN7_FF_VS_REF_CNT_FFME);
/* enable HiZ Raw Stall Optimization */
I915_WRITE(CACHE_MODE_0_GEN7,
_MASKED_BIT_DISABLE(HIZ_RAW_STALL_OPT_DISABLE));
/* WaDisable4x2SubspanOptimization:hsw */
I915_WRITE(CACHE_MODE_1,
_MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));