netdev - Re: [PATCH] net: dsa: mv88e6xxx: don't force settings on CPU port

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Date:   Mon, 30 Mar 2020 20:45:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Daniel Mack <daniel@...que.org>
Cc:     vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: don't force settings on CPU port

> Even when the MAC is *forced* to 1G, which is what the code currently
> does? Sorry for the dumb question, but wich code path would undo these
> settings? Where would you start debugging this?

You could add #define DEBUG to the top of driver/net/phy/phylink.c.
You should then see what phylink is up to, including it trying to
configure the MAC. You can add additional printk to
mv88e6xxx_mac_link_up(), mv88e6xxx_mac_link_down(),
mv88e6xxx_mac_config(), etc.

	  Andrew