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net: dsa :mv88e6xxx: Disable unused ports

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If the NO_CPU strap is set, the switch starts in 'dumb hub' mode, with
all ports enable. Ports which are then actively used are reconfigured
as required when the driver starts. However unused ports are left
alone. Change this to disable them, and turn off any SERDES
interface. This could save some power and so reduce the temperature a
bit.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2019-05-01 00:08:31 +02:00 committed by David S. Miller
parent 4a0eb731d6
commit 100a9b9d75
1 changed files with 11 additions and 1 deletions
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12
drivers/net/dsa/mv88e6xxx/chip.c
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@ -2599,8 +2599,18 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
/* Setup Switch Port Registers */
for (i = 0; i < mv88e6xxx_num_ports(chip); i++) {
if (dsa_is_unused_port(ds, i))
if (dsa_is_unused_port(ds, i)) {
err = mv88e6xxx_port_set_state(chip, i,
BR_STATE_DISABLED);
if (err)
goto unlock;
err = mv88e6xxx_serdes_power(chip, i, false);
if (err)
goto unlock;
continue;
}
err = mv88e6xxx_setup_port(chip, i);
if (err)