diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index efab58cb87ad..cd9a14331ec3 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -847,7 +847,7 @@ dw_hdmi_rockchip_encoder_atomic_check(struct drm_encoder *encoder,
 
 	s->output_type = DRM_MODE_CONNECTOR_HDMIA;
 	s->tv_state = &conn_state->tv;
-	s->output_if = VOP_OUTPUT_IF_HDMI0;
+	s->output_if |= VOP_OUTPUT_IF_HDMI0;
 
 	s->output_mode = output_mode;
 	s->bus_format = bus_format;