net: phy: let genphy_c45_read_abilities also check aneg capability

When using genphy_c45_read_abilities() as get_features callback we
also have to set the autoneg capability in phydev->supported.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy-c45.c

@@ -380,6 +380,17 @@ int genphy_c45_pma_read_abilities(struct phy_device *phydev)
 {
 	int val;
 
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
+	if (phydev->c45_ids.devices_in_package & MDIO_DEVS_AN) {
+		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
+		if (val < 0)
+			return val;
+
+		if (val & MDIO_AN_STAT1_ABLE)
+			linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+					 phydev->supported);
+	}
+
 	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT2);
 	if (val < 0)
 		return val;