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

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>

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8a960d1..4254e91 100644 (file)
--- 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);