dsa: mv88e6xxx: Set DSA mode based on chip abilities

Older devices only support a single DSA frame format, where as newer
devices have two. Take this into account when configuring a DSA port.
The port needs to be in plain old DSA mode, since this is a DSA link,
where as the newer format can be used for the CPU port.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/mv88e6xxx.c

@@ -1987,12 +1987,15 @@ static int mv88e6xxx_setup_port(struct dsa_switch *ds, int port)
 				reg |= PORT_CONTROL_EGRESS_ADD_TAG;
 		}
 	}
+	if (dsa_is_dsa_port(ds, port)) {
+		if (mv88e6xxx_6095_family(ds) || mv88e6xxx_6185_family(ds))
+			reg |= PORT_CONTROL_DSA_TAG;
 		if (mv88e6xxx_6352_family(ds) || mv88e6xxx_6351_family(ds) ||
 		    mv88e6xxx_6165_family(ds) || mv88e6xxx_6097_family(ds) ||
-	    mv88e6xxx_6095_family(ds) || mv88e6xxx_6065_family(ds) ||
 		    mv88e6xxx_6320_family(ds)) {
-		if (dsa_is_dsa_port(ds, port))
 			reg |= PORT_CONTROL_FRAME_MODE_DSA;
+		}
+
 		if (port == dsa_upstream_port(ds))
 			reg |= PORT_CONTROL_FORWARD_UNKNOWN |
 				PORT_CONTROL_FORWARD_UNKNOWN_MC;