linux-kernel - Re: [PATCH net-next] Revert "net: ethernet: ti: am65-cpsw: fixup PHY mode for fixed RGMII TX delay"

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Message-ID: <20250918075651.4676f808@kernel.org>
Date: Thu, 18 Sep 2025 07:56:51 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc: Michael Walle <mwalle@...nel.org>, Siddharth Vadapalli
 <s-vadapalli@...com>, Andrew Lunn <andrew@...n.ch>, Nishanth Menon
 <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, Tero Kristo
 <kristo@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, "David S .
 Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Roger Quadros <rogerq@...nel.org>, Simon Horman
 <horms@...nel.org>, Maxime Chevallier <maxime.chevallier@...tlin.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux@...tq-group.com
Subject: Re: [PATCH net-next] Revert "net: ethernet: ti: am65-cpsw: fixup
 PHY mode for fixed RGMII TX delay"

On Mon, 04 Aug 2025 15:45:08 +0200 Matthias Schiffer wrote:
> > > Disabling the TX delay may or may not result in an operational system.
> > > This holds true for all SoCs with various CPSW instances that are
> > > programmed by the am65-cpsw-nuss.c driver along with the phy-gmii-sel.c
> > > driver.  
> > 
> > In that case u-boot shall be fixed, soon. And to workaround older
> > u-boot versions, linux shall always enable that delay, like Andrew
> > proposed.  
> 
> I can submit my patch for U-Boot some time this week, probably tomorrow. Do you
> also want me to take care of the Linux side for enabling the MAC delay?

What's the conclusion with this regression?
If we need a fix in Linux it'd be great to have it before v6.17 is cut.