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

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Date:   Mon, 18 Jan 2021 18:31:19 +0100
From:   Tobias Waldekranz <tobias@...dekranz.com>
To:     Chris Healy <cphealy@...il.com>, 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 Sun, Jul 19, 2020 at 14:43, Chris Healy <cphealy@...il.com> wrote:
> 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.

Hi Chris,

Did you manage to track this down?

I am seeing the exact same issue. I have tried both a 1000base-x SFP and
a copper 1000base-T and get the same result on both - transmit is fine
but rx only works up to the SERDES, no rx MAC counters are moving.