diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index be102e7255ee8dca1680ba70d709c750a2112d6a..29131409a4de92e18875d044a1a97a9742db801f 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -344,7 +344,8 @@ static void vc4_crtc_config_pv(struct drm_crtc *crtc)
 			   (is_dsi ? PV_VCONTROL_DSI : 0));
 	}
 
-	CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
+	if (is_dsi)
+		CRTC_WRITE(PV_HACT_ACT, mode->hdisplay * pixel_rep);
 
 	CRTC_WRITE(PV_CONTROL,
 		   VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |