diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 16ca34fb5380dba0f860ba6e9310225abf77f19c..6eb5d76e691203333407b9f0846914566a04ccf3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -927,6 +927,12 @@ static void vlv_write_wm_values(struct intel_crtc *crtc,
 			   FW_WM(wm->pipe[PIPE_A].primary >> 8, PLANEA_HI));
 	}
 
+	/* zero (unused) WM1 watermarks */
+	I915_WRITE(DSPFW4, 0);
+	I915_WRITE(DSPFW5, 0);
+	I915_WRITE(DSPFW6, 0);
+	I915_WRITE(DSPHOWM1, 0);
+
 	POSTING_READ(DSPFW1);
 }