netdev - Re: [PATCH v2] net: fec: fix MDIO probing for some FEC hardware blocks

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Date:   Fri, 30 Oct 2020 01:02:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Greg Ungerer <gerg@...ux-m68k.org>
Cc:     netdev@...r.kernel.org, fugang.duan@....com, cphealy@...il.com,
        dkarr@...x.com, clemens.gruber@...ruber.com
Subject: Re: [PATCH v2] net: fec: fix MDIO probing for some FEC hardware
 blocks

On Wed, Oct 28, 2020 at 03:22:32PM +1000, Greg Ungerer wrote:
> Some (apparently older) versions of the FEC hardware block do not like
> the MMFR register being cleared to avoid generation of MII events at
> initialization time. The action of clearing this register results in no
> future MII events being generated at all on the problem block. This means
> the probing of the MDIO bus will find no PHYs.
> 
> Create a quirk that can be checked at the FECs MII init time so that
> the right thing is done. The quirk is set as appropriate for the FEC
> hardware blocks that are known to need this.
> 
> Fixes: f166f890c8f0 ("net: ethernet: fec: Replace interrupt driven MDIO with polled IO")
> Signed-off-by: Greg Ungerer <gerg@...ux-m68k.org>

Tested-by: Andrew Lunn <andrew@...n.ch>

I tested this on Vybrid, which is not the best of platforms, since i
never had any of these problems on this platform.

Jakub, this is for net.

    Andrew