netdev - Re: [PATCH net v2] net: dsa: mv88e6xxx: Fix failed probe due to unsupported C45 reads

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Date: Thu, 01 Feb 2024 00:20:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Andrew Lunn <andrew@...n.ch>
Cc: edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 davem@...emloft.net, vladimir.oltean@....com, netdev@...r.kernel.org,
 stable@...r.kernel.org, tmenninger@...estorage.com
Subject: Re: [PATCH net v2] net: dsa: mv88e6xxx: Fix failed probe due to
 unsupported C45 reads

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Mon, 29 Jan 2024 23:49:48 +0100 you wrote:
> Not all mv88e6xxx device support C45 read/write operations. Those
> which do not return -EOPNOTSUPP. However, when phylib scans the bus,
> it considers this fatal, and the probe of the MDIO bus fails, which in
> term causes the mv88e6xxx probe as a whole to fail.
> 
> When there is no device on the bus for a given address, the pull up
> resistor on the data line results in the read returning 0xffff. The
> phylib core code understands this when scanning for devices on the
> bus. C45 allows multiple devices to be supported at one address, so
> phylib will perform a few reads at each address, so although thought
> not the most efficient solution, it is a way to avoid fatal
> errors. Make use of this as a minimal fix for stable to fix the
> probing problems.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: dsa: mv88e6xxx: Fix failed probe due to unsupported C45 reads
    https://git.kernel.org/netdev/net/c/585b40e25dc9

You are awesome, thank you!
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