diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 70bbe8ef8f54f5897b79c7c6dd6c01dd35e1cd73..1bd9462d206f6acc2bc262f56bf72b9ef9c8a0c8 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1326,9 +1326,6 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine)
 	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
 			    GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);
 
-	/* ReadHitWriteOnlyDisable: cnl */
-	WA_SET_BIT_MASKED(SLICE_UNIT_LEVEL_CLKGATE, RCCUNIT_CLKGATE_DIS);
-
 	/* WaEnablePreemptionGranularityControlByUMD:cnl */
 	I915_WRITE(GEN7_FF_SLICE_CS_CHICKEN1,
 		   _MASKED_BIT_ENABLE(GEN9_FFSC_PERCTX_PREEMPT_CTRL));
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8e7f02e6008aae8a124ee0e607114f4a7682e1bd..8c69ec9eb6eec8a5ab95155302edffdfad6c3e73 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8471,11 +8471,13 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
 	I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
 		   DISP_FBC_MEMORY_WAKE);
 
+	val = I915_READ(SLICE_UNIT_LEVEL_CLKGATE);
+	/* ReadHitWriteOnlyDisable:cnl */
+	val |= RCCUNIT_CLKGATE_DIS;
 	/* WaSarbUnitClockGatingDisable:cnl (pre-prod) */
 	if (IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0))
-		I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
-			   I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
-			   SARBUNIT_CLKGATE_DIS);
+		val |= SARBUNIT_CLKGATE_DIS;
+	I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE, val);
 
 	/* Display WA #1133: WaFbcSkipSegments:cnl */
 	val = I915_READ(ILK_DPFC_CHICKEN);