drm/i915: Enable EI mode for RCx decision making on Sandybridge

And no I have no idea what the difference is either, just that is the
recommendation.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe6538297872..c79bee4b4d56 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6141,6 +6141,7 @@ static void gen6_enable_rc6(struct drm_i915_private *dev_priv)
         I915_WRITE(GEN6_RC_CONTROL,
                    GEN6_RC_CTL_RC6p_ENABLE |
                    GEN6_RC_CTL_RC6_ENABLE |
+                   GEN6_RC_CTL_EI_MODE(1) |
                    GEN6_RC_CTL_HW_ENABLE);
 
         I915_WRITE(GEN6_RC_NORMAL_FREQ,