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 <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 17 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index adfb9781799e..a948c807349d 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/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);
 }
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index de900ea70fd4..6a196cd6a61a 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/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;
 }