linux-kernel - Re: Aquantia PHY in OCSGMII mode?

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Message-ID: <aIyq9Vg8Tqr5z0Zs@FUE-ALEWI-WINX>
Date: Fri, 1 Aug 2025 13:54:29 +0200
From: Alexander Wilhelm <alexander.wilhelm@...termo.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Aquantia PHY in OCSGMII mode?

Am Fri, Aug 01, 2025 at 02:01:06PM +0300 schrieb Vladimir Oltean:
> On Thu, Jul 31, 2025 at 08:26:43PM +0100, Russell King (Oracle) wrote:
> > and this works. So... we could actually reconfigure the PHY independent
> > of what was programmed into the firmware.
> 
> It does work indeed, the trouble will be adding this code to the common
> mainline kernel driver and then watching various boards break after their
> known-good firmware provisioning was overwritten, from a source of unknown
> applicability to their system.

You're right. I've now selected a firmware that uses a different provisioning
table, which already configures the PHY for 2500BASE-X with Flow Control.
According to the documentation, it should support all modes: 10M, 100M, 1G, and
2.5G.

It seems the issue lies with the MAC, as it doesn't appear to handle the
configured PHY_INTERFACE_MODE_2500BASEX correctly. I'm currently investigating
this further.


Best regards
Alexander Wilhelm