netdev - Re: mv88e6240 configuration broken for B850v3

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Date:   Mon, 06 Dec 2021 18:37:44 +0000
From:   Martyn Welch <martyn.welch@...labora.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, kernel@...labora.com,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: mv88e6240 configuration broken for B850v3

On Mon, 2021-12-06 at 20:31 +0200, Vladimir Oltean wrote:
> On Mon, Dec 06, 2021 at 06:26:25PM +0000, Martyn Welch wrote:
> > On Mon, 2021-12-06 at 17:44 +0000, Martyn Welch wrote:
> > > On Fri, 2021-12-03 at 17:25 +0100, Andrew Lunn wrote:
> > > > > Hi Andrew,
> > > > 
> > > > Adding Russell to Cc:
> > > > 
> > > > > I'm currently in the process of updating the GE B850v3 [1] to
> > > > > run
> > > > > a
> > > > > newer kernel than the one it's currently running. 
> > > > 
> > > > Which kernel exactly. We like bug reports against net-next, or
> > > > at
> > > > least the last -rc.
> > > > 
> > > 
> > > I tested using v5.15-rc3 and that was also affected.
> > > 
> > 
> > I've just tested v5.16-rc4 (sorry - just realised I previously
> > wrote
> > v5.15-rc3, it was v5.16-rc3...) and that was exactly the same.
> 
> Just to clarify: you're saying that you're on v5.16-rc4 and that if
> you
> revert commit 3be98b2d5fbc ("net: dsa: Down cpu/dsa ports phylink
> will
> control"), the link works again?
> 

Correct

> It is a bit strange that the external ports negotiate at 10Mbps/Full,
> is that the link speed you intend the ports to work at?

Yes, that's 100% intentional due to what's connected to to those ports
and the environment it works in.

Martyn