drm/i915: Drop bogus comment about RCPB unit clock gating on IVB

Someone copy pasted the comment from the SNB code w/o reading it.
We never actually implemented the workaround to disable RCPB unit
clock gating on IVB. It would have been needed for early steppings,
but we don't care about those anymore, so just remove the stale
comment.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.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 28b5ac9e19ee81a9e061a23f817d43d3e2accf19..35e4bbbd6b0f04240697f00c9630beb5de896cce 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4850,13 +4850,7 @@ static void ivybridge_init_clock_gating(struct drm_device *dev)
        I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) &
                   ~L3SQ_URB_READ_CAM_MATCH_DISABLE);
 
-       /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
-        * gating disable must be set.  Failure to set it results in
-        * flickering pixels due to Z write ordering failures after
-        * some amount of runtime in the Mesa "fire" demo, and Unigine
-        * Sanctuary and Tropics, and apparently anything else with
-        * alpha test or pixel discard.
-        *
+       /*
         * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
         * This implements the WaDisableRCZUnitClockGating:ivb workaround.
         */