Revert "net: phy: marvell: avoid pause mode on SGMII-to-Copper for 88e151x"

This reverts commit 6623c0f.

The original diagnosis was incorrect: it appears that the NIC had
PHY polling mode enabled, which meant that it overwrote the PHYs
advertisement register during negotiation.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Tested-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Russell King

drivers/net/phy/marvell.c

@@ -847,7 +847,6 @@ static int m88e1510_config_init(struct phy_device *phydev)
 
 	/* SGMII-to-Copper mode initialization */
 	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
-
 		/* Select page 18 */
 		err = marvell_set_page(phydev, 18);
 		if (err < 0)
@@ -870,21 +869,6 @@ static int m88e1510_config_init(struct phy_device *phydev)
 		err = marvell_set_page(phydev, MII_MARVELL_COPPER_PAGE);
 		if (err < 0)
 			return err;
-
-		/* There appears to be a bug in the 88e1512 when used in
-		 * SGMII to copper mode, where the AN advertisement register
-		 * clears the pause bits each time a negotiation occurs.
-		 * This means we can never be truely sure what was advertised,
-		 * so disable Pause support.
-		 */
-		linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
-				   phydev->supported);
-		linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
-				   phydev->supported);
-		linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
-				   phydev->advertising);
-		linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
-				   phydev->advertising);
 	}
 
 	return m88e1318_config_init(phydev);