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Date:   Wed, 11 Dec 2019 18:49:38 +0100
From:   Andrew Lunn <>
To:     Baruch Siach <>
Cc:     Vivien Didelot <>,,
        Denis Odintsov <>,
        Hubert Feurstein <>
Subject: Re: [BUG] mv88e6xxx: tx regression in v5.3

> Bisect points at 7fb5a711545d ("net: dsa: mv88e6xxx: drop adjust_link to
> enabled phylink"). Reverting this commit on top of v5.3.15 fixes the
> issue (and brings the warning back). As I understand, this basically
> reverts the driver migration to phylink. What might be the issue with
> phylink?

That suggests the MAC is wrongly running at 1G, and the PHY at 100M,
which is why it does not work.

You probably want to add #define DEBUG to the top of phylink.c, and
scatter some debug prints in mv88e6xxx_mac_config(). My guess would
be, either mv88e6xxx_mac_config() is existing before configuring the
MAC, or mv88e6xxx_port_setup_mac() has wrongly decided nothing has
changed and so has not configured the MAC.


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