tg3: Discover phy address once

The phy address will not change after it has been identified.  Move the
discovery code to a location that only gets executed once.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/tg3.c

@@ -1035,6 +1035,17 @@ static void tg3_mdio_start(struct tg3 *tp)
 	tw32_f(MAC_MI_MODE, tp->mi_mode);
 	udelay(80);
 
+	if ((tp->tg3_flags3 & TG3_FLG3_MDIOBUS_INITED) &&
+	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785)
+		tg3_mdio_config_5785(tp);
+}
+
+static int tg3_mdio_init(struct tg3 *tp)
+{
+	int i;
+	u32 reg;
+	struct phy_device *phydev;
+
 	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717) {
 		u32 funcnum, is_serdes;
 
@@ -1054,17 +1065,6 @@ static void tg3_mdio_start(struct tg3 *tp)
 	} else
 		tp->phy_addr = TG3_PHY_MII_ADDR;
 
-	if ((tp->tg3_flags3 & TG3_FLG3_MDIOBUS_INITED) &&
-	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785)
-		tg3_mdio_config_5785(tp);
-}
-
-static int tg3_mdio_init(struct tg3 *tp)
-{
-	int i;
-	u32 reg;
-	struct phy_device *phydev;
-
 	tg3_mdio_start(tp);
 
 	if (!(tp->tg3_flags3 & TG3_FLG3_USE_PHYLIB) ||