netdev - Re: [PATCH net-next v1 0/9] Ethernet Cable test support

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Date:   Thu, 30 Apr 2020 20:23:31 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     cphealy@...il.com, davem@...emloft.net, f.fainelli@...il.com,
        hkallweit1@...il.com, mkubecek@...e.cz, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 0/9] Ethernet Cable test support

> Ok. I do have one problem. TDR works fine for the AR8031 and the
> BCM54140 as long as there is no link partner, i.e. open cable,
> shorted pairs etc. But as soon as there is a link partner and a
> link, both PHYs return garbage. As far as I understand TDR, there
> must not be a link, correct?

Correct.

The Marvell PHY will down the link and then wait 1.5 seconds before
starting TDR, if you set a bit. I _think_ it downs the link by turning
off autoneg.

Maybe there is some hints in 802.3 clause 22?

      Andrew