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drm/i915: enable HiZ Raw Stall Optimization on HSW 

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));