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

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Message-ID: <c3e863b8-2143-fee3-bb0b-65699661d7ab@gmail.com>
Date:   Mon, 27 Jan 2020 20:28:21 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is
 up without PHY

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