r8169: PHY power-on fix

Fix extracted from Realtek's driver (8.002.00/20070713) for the PHY
attached to 8111/8168b chipsets.

The check against mac_version is just usual paranoia during the bugfix
period of the kernel cycle. -- FR

Tested on Asus M2A-VM motherboard by Roger So.
No regression on my Asrock 945G DVI either (built-in 8168 + 2x8169).
Signed-off-by: Roger So <roger.so@gmail.com>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>

drivers/net/r8169.c

@@ -725,6 +725,12 @@ static int rtl8169_set_speed_xmii(struct net_device *dev,
 
 	auto_nego |= ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
 
+	if (tp->mac_version == RTL_GIGA_MAC_VER_12) {
+		/* Vendor specific (0x1f) and reserved (0x0e) MII registers. */
+		mdio_write(ioaddr, 0x1f, 0x0000);
+		mdio_write(ioaddr, 0x0e, 0x0000);
+	}
+
 	tp->phy_auto_nego_reg = auto_nego;
 	tp->phy_1000_ctrl_reg = giga_ctrl;