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drm/i915/chv: Use timeout mode for RC6 on chv

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Higher RC6 residency is observed using timeout mode
instead of EI mode. It's Recommended to use TO Method for RC6.

v2: Add comment about timeout threshold. (Tom)

Signed-off-by: Deepak S <deepak.s@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Deepak S 2014-12-13 11:43:27 +05:30 committed by Daniel Vetter
parent c61200c2c7
commit 5a0afd4b78
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
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@ -4689,7 +4689,8 @@ 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,
@ -4703,7 +4704,7 @@ 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);