drm/i915: set IDICOS to medium uncore resources

I'm seeing about a 5% FPS improvement across various benchmarks on my
IVB i3. Rumor has it that the higher end parts show even more benefit.

This derives from a patch originally given to me by Bernard. The docs
are  confusing about the definition names (ie. medium really seems like
max), but it would seem it gives more cache to the GT at the expense of
uncore. This configuration makes the split most in favor of the GT. I've
not tried the other IDICOS values.

Cc: "Kilarski, Bernard R" <bernard.r.kilarski@intel.com>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b7de5ea62aa4c8f10138eec8aba07b9630c96869..404b474eaea32237c2d45586e0bc39f8f17ae619 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3384,6 +3384,7 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int pipe;
        uint32_t dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE;
+       uint32_t snpcr;
 
        I915_WRITE(PCH_DSPCLK_GATE_D, dspclk_gate);
 
@@ -3429,6 +3430,11 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
        /* WaDisable4x2SubspanOptimization */
        I915_WRITE(CACHE_MODE_1,
                   _MASKED_BIT_ENABLE(PIXEL_SUBSPAN_COLLECT_OPT_DISABLE));
+
+       snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
+       snpcr &= ~GEN6_MBC_SNPCR_MASK;
+       snpcr |= GEN6_MBC_SNPCR_MED;
+       I915_WRITE(GEN6_MBCUNIT_SNPCR, snpcr);
 }
 
 static void valleyview_init_clock_gating(struct drm_device *dev)