Am Thu, Dec 21, 2023 at 02:47:57PM +0100 schrieb Stefan Eichenberger:

Hi Dimitri,

Hi Stefan,

On Thu, Dec 21, 2023 at 08:28:51AM +0100, Dimitri Fedrau wrote:

quoted

Add a driver for the Marvell 88Q2220. This driver allows to detect the
link, switch between 100BASE-T1 and 1000BASE-T1 and switch between
master and slave mode and autonegotiation.

Signed-off-by: Dimitri Fedrau <redacted>

I tried to make your patch work in my setup but I'm unable to force a
link speed. Were you able to force a different link speed with the
following command?
ethtool -s eth0 speed 100 autoneg off

I tested following modes, which all worked:

ethtool -s eth0 autoneg on master-slave forced-master
ethtool -s eth0 autoneg on master-slave preferred-master
ethtool -s eth0 autoneg on master-slave preferred-slave
ethtool -s eth0 autoneg on master-slave forced-slave

ethtool -s eth0 autoneg on master-slave forced-master speed 100
ethtool -s eth0 autoneg on master-slave preferred-master speed 100
ethtool -s eth0 autoneg on master-slave preferred-slave	speed 100
ethtool -s eth0 autoneg on master-slave forced-slave speed 100

ethtool -s eth0 autoneg off master-slave forced-master speed 1000
ethtool -s eth0 autoneg off master-slave preferred-master speed 1000
ethtool -s eth0 autoneg off master-slave preferred-slave speed 1000
ethtool -s eth0 autoneg off master-slave forced-slave speed 1000

ethtool -s eth0 autoneg off master-slave forced-master speed 100
ethtool -s eth0 autoneg off master-slave preferred-master speed 100
ethtool -s eth0 autoneg off master-slave preferred-slave speed 100
ethtool -s eth0 autoneg off master-slave forced-slave speed 100

Without setting the master-slave option it didn't work. I think its
mandatory.

Regards,
Stefan

Best regards,
Stefan