net: phy: Support setting polarity in marvell phy driver

Support manually setting the polarity to mdi or mdix
Signed-off-by: David Thomson <david.thomson@alliedtelesis.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/marvell.c

@@ -48,6 +48,8 @@
 #define MII_M1011_IMASK_CLEAR		0x0000
 
 #define MII_M1011_PHY_SCR		0x10
+#define MII_M1011_PHY_SCR_MDI		0x0000
+#define MII_M1011_PHY_SCR_MDI_X		0x0020
 #define MII_M1011_PHY_SCR_AUTO_CROSS	0x0060
 
 #define MII_M1145_PHY_EXT_SR		0x1b
@@ -159,6 +161,43 @@ static int marvell_config_intr(struct phy_device *phydev)
 	return err;
 }
 
+static int marvell_set_polarity(struct phy_device *phydev, int polarity)
+{
+	int reg;
+	int err;
+	int val;
+
+	/* get the current settings */
+	reg = phy_read(phydev, MII_M1011_PHY_SCR);
+	if (reg < 0)
+		return reg;
+
+	val = reg;
+	val &= ~MII_M1011_PHY_SCR_AUTO_CROSS;
+	switch (polarity) {
+	case ETH_TP_MDI:
+		val |= MII_M1011_PHY_SCR_MDI;
+		break;
+	case ETH_TP_MDI_X:
+		val |= MII_M1011_PHY_SCR_MDI_X;
+		break;
+	case ETH_TP_MDI_AUTO:
+	case ETH_TP_MDI_INVALID:
+	default:
+		val |= MII_M1011_PHY_SCR_AUTO_CROSS;
+		break;
+	}
+
+	if (val != reg) {
+		/* Set the new polarity value in the register */
+		err = phy_write(phydev, MII_M1011_PHY_SCR, val);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}
+
 static int marvell_config_aneg(struct phy_device *phydev)
 {
 	int err;
@@ -191,8 +230,7 @@ static int marvell_config_aneg(struct phy_device *phydev)
 	if (err < 0)
 		return err;
 
-	err = phy_write(phydev, MII_M1011_PHY_SCR,
-			MII_M1011_PHY_SCR_AUTO_CROSS);
+	err = marvell_set_polarity(phydev, phydev->mdix);
 	if (err < 0)
 		return err;
 

drivers/net/phy/phy.c

@@ -379,6 +379,7 @@ int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 	cmd->transceiver = phy_is_internal(phydev) ?
 		XCVR_INTERNAL : XCVR_EXTERNAL;
 	cmd->autoneg = phydev->autoneg;
+	cmd->eth_tp_mdix_ctrl = phydev->mdix;
 
 	return 0;
 }