linux-kernel - Re: [PATCH v2] usbnet: asix AX88772: leave the carrier control to phylink

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Message-ID: <20250408082257.7281c61c@kernel.org>
Date: Tue, 8 Apr 2025 08:22:57 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Krzysztof Hałasa <khalasa@...p.pl>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, netdev
 <netdev@...r.kernel.org>, Oliver Neukum <oneukum@...e.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Jose Ignacio
 Tornos Martinez <jtornosm@...hat.com>, Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH v2] usbnet: asix AX88772: leave the carrier control to
 phylink

On Tue, 08 Apr 2025 13:59:41 +0200 Krzysztof Hałasa wrote:
> ASIX AX88772B based USB 10/100 Ethernet adapter doesn't come
> up ("carrier off"), despite the built-in 100BASE-FX PHY positive link
> indication. The internal PHY is configured (using EEPROM) in fixed
> 100 Mbps full duplex mode.
> 
> The primary problem appears to be using carrier_netif_{on,off}() while,
> at the same time, delegating carrier management to phylink. Use only the
> latter and remove "manual control" in the asix driver.
> 
> I don't have any other AX88772 board here, but the problem doesn't seem
> specific to a particular board or settings - it's probably
> timing-dependent.
> 
> Remove unused asix_adjust_link() as well.
> 
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>

In the future, if you don't mind, please add a lore link here, like
this:
---
v1: https://lore.kernel.org/all/m35xjgdvih.fsf@t19.piap.pl/

Sending in-reply-to is discouraged, it messes up patch ordering for
reviewers:
https://www.kernel.org/doc/html/next/process/maintainer-netdev.html#resending-after-review