I've been hacking on a espressobin board to try to improve ptp support,
etc.  However, I have
a big problem with link detection on the wan, lan0 and lan1 ports.

I have a standard bridge configuration using systemd-networkd. 
Currently, I'm working with linux
v4.20.2.

From power on, none of the wan, lan0, lan1 or br0 achieve link
(LOWER_UP).  networkctl shows
no carrier for these ports.  Disconnecting and reconnecting cables is
not detected and makes no
difference to link state.  I  added a debug printout in
mv88e6352_port_link_state, but the routine
is not called.  As far as I can tell, link state changes are not
detected using PHY interrupts.  And yet,
if the card is rebooted, link detection seems to magically work.

I know that the 88E6341 port registers detect port link (also RJ45 LED)
correctly.

The attached patch fixes link detection at power on.  However, link
state still doesn't update if a cable
is disconnected or moved.

I'm puzzled as to how this is supposed to work.  Thoughts?

Regards,
Dave Anglin

-- 
John David Anglin  dave.anglin@bell.net