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net: dsa: mv88e6xxx: Fix 6095/6097/6185 ports in non-SERDES CMODE

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The .serdes_get_lane op used the magic value 0xff to indicate a valid
SERDES lane and 0 signaled that a non-SERDES mode was set on the port.

Unfortunately, "0" is also a valid lane ID, so even when these ports
where configured to e.g. RGMII the driver would set them up as SERDES
ports.

- Replace 0xff with 0 to indicate a valid lane ID. The number is on
  the one hand just as arbitrary, but it is at least the first valid one
  and therefore less of a surprise.

- Follow the other .serdes_get_lane implementations and return -ENODEV
  in the case where no SERDES is assigned to the port.

Fixes: f5be107c33 ("net: dsa: mv88e6xxx: Support serdes ports on MV88E6097/6095/6185")
Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tobias Waldekranz 2021-04-26 18:17:34 +02:00 committed by David S. Miller
parent 152fa81109
commit 6066234aa3
1 changed files with 3 additions and 3 deletions
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6
drivers/net/dsa/mv88e6xxx/serdes.c
View File

@ -443,15 +443,15 @@ int mv88e6185_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
int mv88e6185_serdes_get_lane(struct mv88e6xxx_chip *chip, int port)
{
/* There are no configurable serdes lanes on this switch chip but we
* need to return non-zero so that callers of
* need to return a non-negative lane number so that callers of
* mv88e6xxx_serdes_get_lane() know this is a serdes port.
*/
switch (chip->ports[port].cmode) {
case MV88E6185_PORT_STS_CMODE_SERDES:
case MV88E6185_PORT_STS_CMODE_1000BASE_X:
return 0xff;
default:
return 0;
default:
return -ENODEV;
}
}