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net: dsa: mv88e6xxx: Default ports 9/10 6390X CMODE to 1000BaseX

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The 6390X family has 8 SERDES interfaces. This allows ports 9 and 10
to support up to 10Gbps using 4 SERDES interfaces. However, when lower
speeds are used, which need fewer SERDES interfaces, the unused SERDES
interfaces can be used by ports 2-8.

The hardware defaults to ports 9 and 10 having all 4 SERDES interfaces
assigned to them. This only gets changed when the interface is
configured after what the SFP supports has been determined, or the 10G
PHY completes auto-neg.

For hardware designs which limit ports 9 and 10 to one or two SERDES
interfaces, and place SFPs on the lower interfaces, this is too
late. Those ports with SFP should not wait until ports 9/10 are up in
order to get access to the SERDES interface. So change the default
configuration when the driver is initialised. Configure ports 9 and 10
to 1000BaseX, so they use a single SERDES interface, freeing up the
others. They can steal them back if they need them.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2018-11-11 00:32:16 +01:00 committed by David S. Miller
parent fdc71eea8c
commit 787799a9d5
1 changed files with 6 additions and 3 deletions
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9
drivers/net/dsa/mv88e6xxx/port.c
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@ -368,12 +368,15 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
u16 reg;
int err;
if (mode == PHY_INTERFACE_MODE_NA)
return 0;
if (port != 9 && port != 10)
return -EOPNOTSUPP;
/* Default to a slow mode, so freeing up SERDES interfaces for
* other ports which might use them for SFPs.
*/
if (mode == PHY_INTERFACE_MODE_NA)
mode = PHY_INTERFACE_MODE_1000BASEX;
switch (mode) {
case PHY_INTERFACE_MODE_1000BASEX:
cmode = MV88E6XXX_PORT_STS_CMODE_1000BASE_X;