diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d0a1928870ead44eb64488543ab88b5bcf93d715..03264fd30fdd0c600e4e4629ad5f254f810394c8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6866,6 +6866,8 @@ enum skl_disp_power_wells {
 #define  VLV_SPAREG2H				_MMIO(0xA194)
 
 #define  GTFIFODBG				_MMIO(0x120000)
+#define    GT_FIFO_SBDEDICATE_FREE_ENTRY_CHV	(0x1f << 20)
+#define    GT_FIFO_FREE_ENTRIES_CHV		(0x7f << 13)
 #define    GT_FIFO_SBDROPERR			(1<<6)
 #define    GT_FIFO_BLOBDROPERR			(1<<5)
 #define    GT_FIFO_SB_READ_ABORTERR		(1<<4)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b8e395ad05ac35cc98ca9183771e5527b015fa31..b7c218602c6e53cfca384ccd49b1b6c0e260f552 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4997,7 +4997,8 @@ static void gen6_enable_rps(struct drm_device *dev)
 	I915_WRITE(GEN6_RC_STATE, 0);
 
 	/* Clear the DBG now so we don't confuse earlier errors */
-	if ((gtfifodbg = I915_READ(GTFIFODBG))) {
+	gtfifodbg = I915_READ(GTFIFODBG);
+	if (gtfifodbg) {
 		DRM_ERROR("GT fifo had a previous error %x\n", gtfifodbg);
 		I915_WRITE(GTFIFODBG, gtfifodbg);
 	}
@@ -5528,7 +5529,8 @@ static void cherryview_enable_rps(struct drm_device *dev)
 
 	WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
 
-	gtfifodbg = I915_READ(GTFIFODBG);
+	gtfifodbg = I915_READ(GTFIFODBG) & ~(GT_FIFO_SBDEDICATE_FREE_ENTRY_CHV |
+					     GT_FIFO_FREE_ENTRIES_CHV);
 	if (gtfifodbg) {
 		DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
 				 gtfifodbg);
@@ -5627,7 +5629,8 @@ static void valleyview_enable_rps(struct drm_device *dev)
 
 	valleyview_check_pctx(dev_priv);
 
-	if ((gtfifodbg = I915_READ(GTFIFODBG))) {
+	gtfifodbg = I915_READ(GTFIFODBG);
+	if (gtfifodbg) {
 		DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
 				 gtfifodbg);
 		I915_WRITE(GTFIFODBG, gtfifodbg);