Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

Heiner Kallweit
2020-01-27T19:28:34Z

On 27.01.2020 17:22, Andrew Lunn wrote:
>>> Heiner has another device which has an Aquantia PHY running in an odd
>>> mode so that it does 1G over a T2 link. It uses SGMII for this, and
>>> that is where we first noticed the issue of the MAC and PCS having
>>> different configurations.
>>
>> Do you know when the issue appeared?
>
> As far as i understand, it never worked, it is not a regression as
> such. But Heiner probably knows more.
>
I think you're referring to the issue that was fixed with following
commit: 72d8b4fdbfb6 ("net: dsa: mv88e6xxx: support in-band signalling
on SGMII ports with external PHYs"). The commit description also has a
link to the discussion we had about the issue. If I read it correctly
the issue is independent of this proprietary 1000BaseT2 mode having
been used.

> Andrew
> .
>
Heiner