drm/i915: We implement WaDisableRCCUnitClockGating:snb

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>

drivers/gpu/drm/i915/intel_pm.c

@@ -4609,6 +4609,7 @@ static void gen6_init_clock_gating(struct drm_device *dev)
 	 * but we didn't debug actual testcases to find it out.
 	 *
 	 * Also apply WaDisableVDSUnitClockGating:snb and
+	 * WaDisableRCCUnitClockGating:snb and
 	 * WaDisableRCPBUnitClockGating:snb.
 	 */
 	I915_WRITE(GEN6_UCGCTL2,