Re: [PATCH 4/7] Revert "Revert "drm/i915/chv: Use timeout mode for RC6 on chv""

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On Monday 19 January 2015 05:20 PM, ville.syrjala@xxxxxxxxxxxxxxx wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

The performance regression from the CHV RC6 EI->TO change is now fixed
so re-enable TO mode for better RC6 resicency.

This reverts commit e85a5c7989c5be8fe30acc35eba9fb54b3450f36.

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_pm.c | 5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8c7a07d..8ee65da 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4724,7 +4724,8 @@ static void cherryview_enable_rps(struct drm_device *dev)
  		I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
  	I915_WRITE(GEN6_RC_SLEEP, 0);
- I915_WRITE(GEN6_RC6_THRESHOLD, 50000); /* 50/125ms per EI */
+	/* TO threshold set to 1750 us ( 0x557 * 1.28 us) */
+	I915_WRITE(GEN6_RC6_THRESHOLD, 0x557);
/* allows RC6 residency counter to work */
  	I915_WRITE(VLV_COUNTER_CONTROL,
@@ -4738,7 +4739,7 @@ static void cherryview_enable_rps(struct drm_device *dev)
  	/* 3: Enable RC6 */
  	if ((intel_enable_rc6(dev) & INTEL_RC6_ENABLE) &&
  						(pcbr >> VLV_PCBR_ADDR_SHIFT))
-		rc6_mode = GEN6_RC_CTL_EI_MODE(1);
+		rc6_mode = GEN7_RC_CTL_TO_MODE;
I915_WRITE(GEN6_RC_CONTROL, rc6_mode);

Reviewed-by: Deepak S<deepak.s@xxxxxxxxxxxxxxx>


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