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

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Date:   Wed, 12 Apr 2017 09:16:04 -0700
From:   Tim Harvey <tharvey@...eworks.com>
To:     Andy Duan <fugang.duan@....com>
Cc:     netdev <netdev@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Koen Vandeputte <koen.vandeputte@...ntric.com>
Subject: Re: IMX6 FEC connection drops occasionally with 'MDIO read timeout'

On Sun, Apr 9, 2017 at 6:42 PM, Andy Duan <fugang.duan@....com> wrote:
> From: Tim Harvey <tharvey@...eworks.com> Sent: Friday, April 07, 2017 10:47 PM
>>To: netdev <netdev@...r.kernel.org>
>>Cc: Fabio Estevam <fabio.estevam@....com>; Lucas Stach
>><l.stach@...gutronix.de>; Andy 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
>
> Pls keep ipg clock always on and try it.
> In general, MDIO timeout maybe caused by ipg clock off and mii interrupt lost.
>

Andy,

Sounds like what Andrew was talking about. In this case suspend/resume
is not being used. Is there any other way IPG can get turned off that
I should be looking at?

Tim