diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index 9b17db4..8f22e00 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -171,6 +171,13 @@
 	if (priv->speed != SPEED_1000M)
 		conf |= MII_PORTSELECT;
 
+	if ((priv->interface != PHY_INTERFACE_MODE_MII) &&
+		(priv->interface != PHY_INTERFACE_MODE_GMII)) {
+
+		if (priv->speed == SPEED_100M)
+			conf |= FES_100;
+	}
+
 	if (priv->duplex == FULL_DUPLEX)
 		conf |= FULLDPLXMODE;
 
@@ -531,7 +538,7 @@
 }
 #endif
 
-int designware_initialize(u32 id, ulong base_addr, u32 phy_addr)
+int designware_initialize(u32 id, ulong base_addr, u32 phy_addr, u32 interface)
 {
 	struct eth_device *dev;
 	struct dw_eth_dev *priv;
@@ -565,6 +572,7 @@
 			DW_DMA_BASE_OFFSET);
 	priv->address = phy_addr;
 	priv->phy_configured = 0;
+	priv->interface = interface;
 
 	if (mac_reset(dev) < 0)
 		return -1;