netdev - Re: bug: net: dsa: mv88e6xxx: serdes Unable to communicate on fiber with vf610-zii-dev-rev-c

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Date:   Sun, 19 Jul 2020 14:43:49 -0700
From:   Chris Healy <cphealy@...il.com>
To:     Marek Behun <marek.behun@....cz>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>
Subject: Re: bug: net: dsa: mv88e6xxx: serdes Unable to communicate on fiber
 with vf610-zii-dev-rev-c

On Sat, Jul 18, 2020 at 8:22 AM Marek Behun <marek.behun@....cz> wrote:
>
> On Sat, 18 Jul 2020 17:05:14 +0200
> Andrew Lunn <andrew@...n.ch> wrote:
>
> > > If the traces were broken between the fiber module and the SERDES, I
> > > should not see these counters incrementing.
> >
> > Plus it is reproducible on multiple boards, of different designs.
> >
> > This is somehow specific to the 6390X ports 9 and 10.
> >
> >      Andrew
>
> Hmm.
>
> What about the errata setup?
> It says:
> /* The 6390 copper ports have an errata which require poking magic
>  * values into undocumented hidden registers and then performing a
>  * software reset.
>  */
> But then the port_hidden_write function is called for every port in the
> function mv88e6390_setup_errata, not just for copper ports. Maybe Chris
> should try to not write this hidden register for SerDes ports.

I just disabled the mv88e6390_setup_errata all together and this did
not result in any different behaviour on this broken fiber port.

>
> Marek