diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 0df9ddfcaf55..4f9cf315801c 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2478,6 +2478,9 @@ static int dw_hdmi_setup(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
 	else
 		hdmi->hdmi_data.quant_range = HDMI_QUANTIZATION_RANGE_DEFAULT;
 
+	if (!hdmi->sink_is_hdmi)
+		hdmi->hdmi_data.quant_range = HDMI_QUANTIZATION_RANGE_FULL;
+
 	/*
 	 * According to the dw-hdmi specification 6.4.2
 	 * vp_pr_cd[3:0]: