netdev - Re: [PATCH v4 net-next 0/8] Let phylink manage in-band AN for the PHY

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Date:   Fri, 2 Dec 2022 15:16:19 +0300
From:   Maxim Kochetkov <fido_max@...ox.ru>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        UNGLinuxDriver@...rochip.com,
        bcm-kernel-feedback-list@...adcom.com,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Camelia Groza <camelia.groza@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Sean Anderson <sean.anderson@...o.com>,
        Antoine Tenart <atenart@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Raag Jadav <raagjadav@...il.com>,
        Siddharth Vadapalli <s-vadapalli@...com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Marek Behun <marek.behun@....cz>,
        Maxim Kiselev <bigunclemax@...il.com>
Subject: Re: [PATCH v4 net-next 0/8] Let phylink manage in-band AN for the PHY

Hi!

Please add Maxim Kiselev <bigunclemax@...il.com> to the CC in next 
versions. Because I have no more access to T1040 SoC. Maxim can help 
with testing.

On 18.11.2022 03:01, Vladimir Oltean wrote:
> Problem statement
> ~~~~~~~~~~~~~~~~~
> 
> The on-board SERDES link between an NXP (Lynx) PCS and a PHY may not
> work, depending on whether U-Boot networking was used on that port or not.
> 
> There is no mechanism in Linux (with phylib/phylink, at least) to ensure
> that the MAC driver and the PHY driver have synchronized settings for
> in-band autoneg. It all depends on the 'managed = "in-band-status"'
> device tree property, which does not reflect a stable and unchanging
> reality, and furthermore, some (older) device trees may have this
> property missing when they shouldn't.
>