stmmac: modified pcs mode support for SGMII

This patch modifies the pcs mode support for SGMII. Even though
SGMII does auto-negotiation with phy, it needs stmmac_init_phy and
stmmac_mdio_register function for initializing phy.
Signed-off-by: NByungho An <bh74.an@samsung.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1504,7 +1504,8 @@ static int stmmac_open(struct net_device *dev)
 
 	stmmac_check_ether_addr(priv);
 
-	if (!priv->pcs) {
+	if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
+	    priv->pcs != STMMAC_PCS_RTBI) {
 		ret = stmmac_init_phy(dev);
 		if (ret) {
 			pr_err("%s: Cannot attach to PHY (error: %d)\n",
@@ -1607,7 +1608,8 @@ static int stmmac_open(struct net_device *dev)
 	/* Using PCS we cannot dial with the phy registers at this stage
 	 * so we do not support extra feature like EEE.
 	 */
-	if (!priv->pcs)
+	if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
+	    priv->pcs != STMMAC_PCS_RTBI)
 		priv->eee_enabled = stmmac_eee_init(priv);
 
 	stmmac_init_tx_coalesce(priv);
@@ -2637,7 +2639,8 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
 
 	stmmac_check_pcs_mode(priv);
 
-	if (!priv->pcs) {
+	if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
+	    priv->pcs != STMMAC_PCS_RTBI) {
 		/* MDIO bus Registration */
 		ret = stmmac_mdio_register(ndev);
 		if (ret < 0) {
@@ -2677,7 +2680,8 @@ int stmmac_dvr_remove(struct net_device *ndev)
 	priv->hw->dma->stop_tx(priv->ioaddr);
 
 	stmmac_set_mac(priv->ioaddr, false);
-	if (!priv->pcs)
+	if (priv->pcs != STMMAC_PCS_RGMII && priv->pcs != STMMAC_PCS_TBI &&
+	    priv->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
 	netif_carrier_off(ndev);
 	unregister_netdev(ndev);