From: Deepak S <deepa...@linux.intel.com>
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 <deepa...@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
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 2316d23..2acb3de 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -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);
--
1.9.1
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