diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index babea0c1f..64c51d688 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1146,6 +1146,9 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 {
 	int interface = priv->plat->mac_interface;
 
+	if (interface == PHY_INTERFACE_MODE_NA)
+		interface = priv->plat->phy_interface;
+
 	if (priv->dma_cap.pcs) {
 		if ((interface == PHY_INTERFACE_MODE_RGMII) ||
 		    (interface == PHY_INTERFACE_MODE_RGMII_ID) ||