diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 34c5f583e910..937d61c42b58 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -3353,7 +3353,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
 	hdmi->channels = 2;
 	hdmi->disabled = true;
 	hdmi->rxsense = true;
-	hdmi->phy_mask = (u8)~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE);
+	hdmi->phy_mask = ~(HDMI_PHY_HPD | HDMI_PHY_RX_SENSE) & 0xff;
 	hdmi->mc_clkdis = 0x7f;
 	hdmi->last_connector_result = connector_status_disconnected;