net: dsa: b53: Defer port enabling to calling port_enable

There is no need to configure the enabled ports once in b53_setup() and then a
second time around when dsa_switch_ops::port_enable is called, just do it when
port_enable is called which is better in terms of power consumption and
correctness.
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/b53_common.c

@@ -815,12 +815,13 @@ static int b53_setup(struct dsa_switch *ds)
 	if (ret)
 		dev_err(ds->dev, "failed to apply configuration\n");
 
+	/* Configure IMP/CPU port, disable unused ports. Enabled
+	 * ports will be configured with .port_enable
+	 */
 	for (port = 0; port < dev->num_ports; port++) {
-		if (BIT(port) & ds->enabled_port_mask)
-			b53_enable_port(ds, port, NULL);
-		else if (dsa_is_cpu_port(ds, port))
+		if (dsa_is_cpu_port(ds, port))
 			b53_enable_cpu_port(dev, port);
-		else
+		else if (!(BIT(port) & ds->enabled_port_mask))
 			b53_disable_port(ds, port, NULL);
 	}