Re: [PATCH 2/2] net: phy: microchip: enable downshift by default on LAN88xx

[Andrew Lunn]

On Mon, Mar 30, 2026 at 12:42:00AM +0200, Nicolai Buchwitz wrote:
> Enable auto-downshift from 1000BASE-T to 100BASE-TX after 2 failed
> auto-negotiation attempts by default. This ensures that links with
> faulty or missing cable pairs (C and D) fall back to 100Mbps without
> requiring userspace configuration.
> 
> Users can override or disable downshift at runtime:
> 
>   ethtool --set-phy-tunable eth0 downshift off
> 
> Signed-off-by: Nicolai Buchwitz <nb@xxxxxxxxxxx>

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew