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net: dsa: mv88e6xxx: power serdes on/off for 10G interfaces on 6390X 

Upon setting the cmode on 6390 and 6390X, the associated serdes
interfaces must be powered off/on.

Both 6390X and 6390 share code to do so, but it currently uses the 6390
specific helper mv88e6390_serdes_power() to disable and enable the
serdes interface.

This call will fail silently on 6390X when trying so set a 10G interface
such as XAUI or RXAUI, since mv88e6390_serdes_power() internally grabs
the lane number based on modes supported by the 6390, and returns 0 when
getting -ENODEV as a lane number.

Using mv88e6390x_serdes_power() should be safe here, since we explicitly
rule-out all ports but the 9 and 10, and because modes supported by 6390
ports 9 and 10 are a subset of those supported on 6390X.

This was tested on 6390X using RXAUI mode.

Fixes: 364e9d7776 ("net: dsa: mv88e6xxx: Power on/off SERDES on cmode change")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxime Chevallier 2019-02-28 22:14:33 +01:00 committed by David S. Miller
parent 6e46e2d821
commit d235c48b40
1 changed files with 2 additions and 2 deletions
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4
drivers/net/dsa/mv88e6xxx/port.c
View File

@ -408,7 +408,7 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
return err;
}
err = mv88e6390_serdes_power(chip, port, false);
err = mv88e6390x_serdes_power(chip, port, false);
if (err)
return err;
@ -424,7 +424,7 @@ int mv88e6390x_port_set_cmode(struct mv88e6xxx_chip *chip, int port,
if (err)
return err;
err = mv88e6390_serdes_power(chip, port, true);
err = mv88e6390x_serdes_power(chip, port, true);
if (err)
return err;