net: dsa: felix: stop calling ocelot_port_{enable,disable}

ocelot_port_enable touches ANA_PORT_PORT_CFG, which has the following
fields:

- LOCKED_PORTMOVE_CPU, LEARNDROP, LEARNCPU, LEARNAUTO, RECV_ENA, all of
  which are written with their hardware default values, also runtime
  invariants. So it makes no sense to write these during every .ndo_open.

- PORTID_VAL: this field has an out-of-reset value of zero for all ports
  and must be initialized by software. Additionally, the
  ocelot_setup_logical_port_ids() code path sets up different logical
  port IDs for the ports in a hardware LAG, and we absolutely don't want
  .ndo_open to interfere there and reset those values.

So in fact the write from ocelot_port_enable can better be moved to
ocelot_init_port, and the .ndo_open hook deleted.

ocelot_port_disable touches DEV_MAC_ENA_CFG and QSYS_SWITCH_PORT_MODE_PORT_ENA,
in an attempt to undo what ocelot_adjust_link did. But since .ndo_stop
does not get called each time the link falls (i.e. this isn't a
substitute for .phylink_mac_link_down), felix already does better at
this by writing those registers already in felix_phylink_mac_link_down.

So keep ocelot_port_disable (for now, until ocelot is converted to
phylink too), and just delete the felix call to it, which is not
necessary.

Signed-off-by: Vladimir Oltean <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: vladimiroltean

drivers/net/dsa/ocelot/felix.c

@@ -796,23 +796,6 @@ static int felix_vlan_del(struct dsa_switch *ds, int port,
 	return ocelot_vlan_del(ocelot, port, vlan->vid);
 }
 
-static int felix_port_enable(struct dsa_switch *ds, int port,
-			     struct phy_device *phy)
-{
-	struct ocelot *ocelot = ds->priv;
-
-	ocelot_port_enable(ocelot, port, phy);
-
-	return 0;
-}
-
-static void felix_port_disable(struct dsa_switch *ds, int port)
-{
-	struct ocelot *ocelot = ds->priv;
-
-	return ocelot_port_disable(ocelot, port);
-}
-
 static void felix_phylink_validate(struct dsa_switch *ds, int port,
 				   unsigned long *supported,
 				   struct phylink_link_state *state)
@@ -1615,8 +1598,6 @@ const struct dsa_switch_ops felix_switch_ops = {
 	.phylink_mac_config		= felix_phylink_mac_config,
 	.phylink_mac_link_down		= felix_phylink_mac_link_down,
 	.phylink_mac_link_up		= felix_phylink_mac_link_up,
-	.port_enable			= felix_port_enable,
-	.port_disable			= felix_port_disable,
 	.port_fdb_dump			= felix_fdb_dump,
 	.port_fdb_add			= felix_fdb_add,
 	.port_fdb_del			= felix_fdb_del,

drivers/net/ethernet/mscc/ocelot.c

@@ -514,19 +514,6 @@ void ocelot_adjust_link(struct ocelot *ocelot, int port,
 }
 EXPORT_SYMBOL(ocelot_adjust_link);
 
-void ocelot_port_enable(struct ocelot *ocelot, int port,
-			struct phy_device *phy)
-{
-	/* Enable receiving frames on the port, and activate auto-learning of
-	 * MAC addresses.
-	 */
-	ocelot_write_gix(ocelot, ANA_PORT_PORT_CFG_LEARNAUTO |
-			 ANA_PORT_PORT_CFG_RECV_ENA |
-			 ANA_PORT_PORT_CFG_PORTID_VAL(port),
-			 ANA_PORT_PORT_CFG, port);
-}
-EXPORT_SYMBOL(ocelot_port_enable);
-
 void ocelot_port_disable(struct ocelot *ocelot, int port)
 {
 	struct ocelot_port *ocelot_port = ocelot->ports[port];
@@ -1956,6 +1943,15 @@ void ocelot_init_port(struct ocelot *ocelot, int port)
 	/* Disable source address learning for standalone mode */
 	ocelot_port_set_learning(ocelot, port, false);
 
+	/* Set the port's initial logical port ID value, enable receiving
+	 * frames on it, and configure the MAC address learning type to
+	 * automatic.
+	 */
+	ocelot_write_gix(ocelot, ANA_PORT_PORT_CFG_LEARNAUTO |
+			 ANA_PORT_PORT_CFG_RECV_ENA |
+			 ANA_PORT_PORT_CFG_PORTID_VAL(port),
+			 ANA_PORT_PORT_CFG, port);
+
 	/* Enable vcap lookups */
 	ocelot_vcap_enable(ocelot, port);
 }

drivers/net/ethernet/mscc/ocelot_net.c

@@ -449,8 +449,6 @@ static int ocelot_port_open(struct net_device *dev)
 {
 	struct ocelot_port_private *priv = netdev_priv(dev);
 	struct ocelot_port *ocelot_port = &priv->port;
-	struct ocelot *ocelot = ocelot_port->ocelot;
-	int port = priv->chip_port;
 	int err;
 
 	if (priv->serdes) {
@@ -474,8 +472,6 @@ static int ocelot_port_open(struct net_device *dev)
 	phy_attached_info(priv->phy);
 	phy_start(priv->phy);
 
-	ocelot_port_enable(ocelot, port, priv->phy);
-
 	return 0;
 }
 

include/soc/mscc/ocelot.h

@@ -798,8 +798,6 @@ void ocelot_init_port(struct ocelot *ocelot, int port);
 void ocelot_deinit_port(struct ocelot *ocelot, int port);
 
 /* DSA callbacks */
-void ocelot_port_enable(struct ocelot *ocelot, int port,
-			struct phy_device *phy);
 void ocelot_port_disable(struct ocelot *ocelot, int port);
 void ocelot_get_strings(struct ocelot *ocelot, int port, u32 sset, u8 *data);
 void ocelot_get_ethtool_stats(struct ocelot *ocelot, int port, u64 *data);