netdev - Re: imx8mn with mv88e6320 fails to retrieve IP address

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Message-ID: <2647dbfe-860d-4a45-94ed-d1d160d9a3be@lunn.ch>
Date: Wed, 21 Jun 2023 23:43:42 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Fabio Estevam <festevam@...il.com>
Cc: Vladimir Oltean <olteanv@...il.com>, netdev <netdev@...r.kernel.org>
Subject: Re: imx8mn with mv88e6320 fails to retrieve IP address

> When the Trendnet switch is used, DHCP fails and ethtool reports just
> these lines differently:
> 
>         Link partner advertised link modes:  10baseT/Half 10baseT/Full
>                                              100baseT/Half 100baseT/Full
>                                              1000baseT/Half 1000baseT/Full
>         Link partner advertised pause frame use: Symmetric

Ah, i read that wrong. What you are saying is the Trendnet additionally
has 1000BaseT/Half, and symmetric pause.

1000BaseT/Half should not be causing the problem, 1000baseT/Full will
win the election, and 1000baseT/Half is not even supported by
mv88e6xxx so is not even an option in the election.

So this is might be down to symmetric pause being negotiated.  You
might be able to prove this by hacking mv88e6185_phylink_get_caps()
and remove MAC_SYM_PAUSE. It should then no longer advertise pause,
and so the resolved auto-neg should not have pause.

    Andrew