net: phy: at803x: support qca8081 genphy_c45_pma_read_abilities

qca8081 PHY supports to use genphy_c45_pma_read_abilities for
getting the PHY features supported except for the autoneg ability

but autoneg ability exists in MDIO_STAT1 instead of MMD7.1, add it
manually after calling genphy_c45_pma_read_abilities.
Signed-off-by: Luo Jie <quic_luoj@quicinc.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/at803x.c

@@ -897,15 +897,6 @@ static int at803x_get_features(struct phy_device *phydev)
 	if (err)
 		return err;
 
-	if (phydev->drv->phy_id == QCA8081_PHY_ID) {
-		err = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_NG_EXTABLE);
-		if (err < 0)
-			return err;
-
-		linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported,
-				err & MDIO_PMA_NG_EXTABLE_2_5GBT);
-	}
-
 	if (phydev->drv->phy_id != ATH8031_PHY_ID)
 		return 0;
 
@@ -1991,6 +1982,23 @@ static int qca808x_cable_test_get_status(struct phy_device *phydev, bool *finish
 	return 0;
 }
 
+static int qca808x_get_features(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_c45_pma_read_abilities(phydev);
+	if (ret)
+		return ret;
+
+	/* The autoneg ability is not existed in bit3 of MMD7.1,
+	 * but it is supported by qca808x PHY, so we add it here
+	 * manually.
+	 */
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
+
+	return 0;
+}
+
 static struct phy_driver at803x_driver[] = {
 {
 	/* Qualcomm Atheros AR8035 */
@@ -2160,7 +2168,7 @@ static struct phy_driver at803x_driver[] = {
 	.set_tunable		= at803x_set_tunable,
 	.set_wol		= at803x_set_wol,
 	.get_wol		= at803x_get_wol,
-	.get_features		= at803x_get_features,
+	.get_features		= qca808x_get_features,
 	.config_aneg		= at803x_config_aneg,
 	.suspend		= genphy_suspend,
 	.resume			= genphy_resume,