net: dsa: mv88e6xxx: Make sure to configure ports with external PHYs

The MV88E6xxx can have external PHYs attached to certain ports and those
PHYs could even be on different MDIO bus than the one within the switch.
This patch makes sure that ports with such PHYs are configured correctly
according to the information provided by the PHY.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx/chip.c

@@ -575,6 +575,13 @@ static int mv88e6xxx_port_setup_mac(struct mv88e6xxx_chip *chip, int port,
 	return err;
 }
 
+static int mv88e6xxx_phy_is_internal(struct dsa_switch *ds, int port)
+{
+	struct mv88e6xxx_chip *chip = ds->priv;
+
+	return port < chip->info->num_internal_phys;
+}
+
 /* We expect the switch to perform auto negotiation if there is a real
  * phy. However, in the case of a fixed link phy, we force the port
  * settings from the fixed link settings.
@@ -585,7 +592,8 @@ static void mv88e6xxx_adjust_link(struct dsa_switch *ds, int port,
 	struct mv88e6xxx_chip *chip = ds->priv;
 	int err;
 
-	if (!phy_is_pseudo_fixed_link(phydev))
+	if (!phy_is_pseudo_fixed_link(phydev) &&
+	    mv88e6xxx_phy_is_internal(ds, port))
 		return;
 
 	mutex_lock(&chip->reg_lock);
@@ -709,13 +717,17 @@ static void mv88e6xxx_mac_config(struct dsa_switch *ds, int port,
 	struct mv88e6xxx_chip *chip = ds->priv;
 	int speed, duplex, link, pause, err;
 
-	if (mode == MLO_AN_PHY)
+	if ((mode == MLO_AN_PHY) && mv88e6xxx_phy_is_internal(ds, port))
 		return;
 
 	if (mode == MLO_AN_FIXED) {
 		link = LINK_FORCED_UP;
 		speed = state->speed;
 		duplex = state->duplex;
+	} else if (!mv88e6xxx_phy_is_internal(ds, port)) {
+		link = state->link;
+		speed = state->speed;
+		duplex = state->duplex;
 	} else {
 		speed = SPEED_UNFORCED;
 		duplex = DUPLEX_UNFORCED;