netdev - Re: [PATCH net v1 1/1] net: phy: microchip: Reset LAN88xx PHY to ensure clean link state on LAN7800/7850

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Message-ID: <Zzt7P6KklGzgrtob@pengutronix.de>
Date: Mon, 18 Nov 2024 18:37:03 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Yuiko Oshino <yuiko.oshino@...rochip.com>, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com, Phil Elwell <phil@...pberrypi.org>
Subject: Re: [PATCH net v1 1/1] net: phy: microchip: Reset LAN88xx PHY to
 ensure clean link state on LAN7800/7850

On Mon, Nov 18, 2024 at 05:48:49PM +0100, Maxime Chevallier wrote:
> Hi Oleksij,
> 
> On Sun, 17 Nov 2024 11:21:47 +0100
> Oleksij Rempel <o.rempel@...gutronix.de> wrote:
> 
> > Fix outdated MII_LPA data in the LAN88xx PHY, which is used in LAN7800
> > and LAN7850 USB Ethernet controllers. Due to a hardware limitation, the
> > PHY cannot reliably update link status after parallel detection when the
> > link partner does not support auto-negotiation. To mitigate this, add a
> > PHY reset in `lan88xx_link_change_notify()` when `phydev->state` is
> > `PHY_NOLINK`, ensuring the PHY starts in a clean state and reports
> > accurate fixed link parallel detection results.
> > 
> > Fixes: 792aec47d59d9 ("add microchip LAN88xx phy driver")
> > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> 
> This looks like the issue in the Asix AX88772A, but your patch has
> better error handling :)

It was my code in Asix. Need to add proper error handling too. It is not
nice if device is detached but kernel is continuing executing things and
printing a lot of errors.

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