Re: [PATCH] net: phy: intel-xway: workaround 100BASE-TX Link-Up issue

[Andrew Lunn]

On Tue, Sep 15, 2026 at 10:59:17AM +0200, A. Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxxxx>
> 
> MaxLinear GSW12x/GSW14x Ethernet Switch Errata Sheet states:
> "An issue has been sporadically observed after device power-on on the first
> link-up attempt in 100BASE-TX mode resulting in either the link-up taking a
> long time, or failing to link-up altogether...
> 
> Workaround:
> After power-on, enable Cable Diagnostic Mode for all ports and disable
> it..."
> 
> Implement the proposed workaround unconditionally in the Intel XWAY driver
> (MaxLinear GSW1xx switches incorporate Intel XWAY PHYs) because the
> diagnostic bits have the same meaning even in older integral PHYs such as
> GPY111/PEF7071/PHY11G. So it's not clear how to distinguish the affected
> newer integrated PHYs, but the workaround should not hurt the older PHYs.
> 
> Cc: stable@xxxxxxxxxxxxxxx

Please set the Subject: line correctly to indicate net, and include a
Fixes: tag.

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html

Out if interest, is there sufficient details in the data sheet to
implement cable diagnostics?

    Andrew

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pw-bot: cr