kernel: ar8216: add get_features method

Modifying PHY capabilities in the probe function broke with upstream
commit 92ed2eb7f4b7 ("net: phy: probe the PHY before determining the
supported features").

AR8316 switches only support 10/100 Mbit/s link modes because of this
change.

Provide a get_features method for the PHY driver, so Gigabit link mode
will be advertised to link partners again.

Signed-off-by: David Bauer <[email protected]>

target/linux/generic/files/drivers/net/phy/ar8216.c

@@ -2552,6 +2552,18 @@ ar8xxx_phy_config_aneg(struct phy_device *phydev)
 	return genphy_config_aneg(phydev);
 }
 
+static int
+ar8xxx_get_features(struct phy_device *phydev)
+{
+	struct ar8xxx_priv *priv = phydev->priv;
+
+	linkmode_copy(phydev->supported, PHY_BASIC_FEATURES);
+	if (ar8xxx_has_gige(priv))
+		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
+
+	return 0;
+}
+
 static const u32 ar8xxx_phy_ids[] = {
 	0x004dd033,
 	0x004dd034, /* AR8327 */
@@ -2649,29 +2661,14 @@ ar8xxx_phy_probe(struct phy_device *phydev)
 found:
 	priv->use_count++;
 
-	if (phydev->mdio.addr == 0) {
-		linkmode_zero(phydev->supported);
-		if (ar8xxx_has_gige(priv))
-			linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
-		else
-			linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported);
-		linkmode_copy(phydev->advertising, phydev->supported);
+	if (phydev->mdio.addr == 0 && priv->chip->config_at_probe) {
+		priv->phy = phydev;
 
-		if (priv->chip->config_at_probe) {
-			priv->phy = phydev;
-
-			ret = ar8xxx_start(priv);
-			if (ret)
-				goto err_unregister_switch;
-		}
-	} else {
-		if (ar8xxx_has_gige(priv)) {
-			linkmode_zero(phydev->supported);
-			linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, phydev->supported);
-			linkmode_copy(phydev->advertising, phydev->supported);
-		}
-		if (priv->chip->phy_rgmii_set)
-			priv->chip->phy_rgmii_set(priv, phydev);
+		ret = ar8xxx_start(priv);
+		if (ret)
+			goto err_unregister_switch;
+	} else if (priv->chip->phy_rgmii_set) {
+		priv->chip->phy_rgmii_set(priv, phydev);
 	}
 
 	phydev->priv = priv;
@@ -2746,7 +2743,6 @@ static struct phy_driver ar8xxx_phy_driver[] = {
 		.phy_id		= 0x004d0000,
 		.name		= "Atheros AR8216/AR8236/AR8316",
 		.phy_id_mask	= 0xffff0000,
-		.features	= PHY_BASIC_FEATURES,
 		.probe		= ar8xxx_phy_probe,
 		.remove		= ar8xxx_phy_remove,
 		.detach		= ar8xxx_phy_detach,
@@ -2754,6 +2750,7 @@ static struct phy_driver ar8xxx_phy_driver[] = {
 		.config_aneg	= ar8xxx_phy_config_aneg,
 		.read_status	= ar8xxx_phy_read_status,
 		.soft_reset	= ar8xxx_phy_soft_reset,
+		.get_features	= ar8xxx_get_features,
 	}
 };