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net: dsa: mv88e6xxx: Default ports 9/10 6390X CMODE to 1000BaseX
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>
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@ -368,12 +368,15 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
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u16 reg;
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int err;
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if (mode == PHY_INTERFACE_MODE_NA)
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return 0;
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if (port != 9 && port != 10)
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return -EOPNOTSUPP;
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/* Default to a slow mode, so freeing up SERDES interfaces for
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* other ports which might use them for SFPs.
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*/
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if (mode == PHY_INTERFACE_MODE_NA)
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mode = PHY_INTERFACE_MODE_1000BASEX;
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switch (mode) {
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case PHY_INTERFACE_MODE_1000BASEX:
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cmode = MV88E6XXX_PORT_STS_CMODE_1000BASE_X;
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