netdev - IMX6 FEC connection drops occasionally with 'MDIO read timeout'

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Date:   Fri, 7 Apr 2017 07:47:17 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     netdev <netdev@...r.kernel.org>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fugang Duan <fugang.duan@....com>,
        Koen Vandeputte <koen.vandeputte@...ntric.com>
Subject: IMX6 FEC connection drops occasionally with 'MDIO read timeout'

Greetings,

I've had a couple of users report that they are getting occasional
link drops when using IMX6 FEC on our boards which are using a Marvell
88E1510 PHY:

[ 9348.474418] fec 2188000.ethernet eth0: MDIO read timeout
[ 9350.478804] fec 2188000.ethernet eth0: Link is Down

If they bring the interface back up it works fine.

The most recent version of Linux they have tested and seen this on is
v4.9 with CONFIG_MARVELL_PHY=y

Has anyone else run into this or know what the issue could be? Should
there be any retries at the MDIO level or above?

Regards,

Tim