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 <g...@linux-m68k.org>
Tested-by: Andrew Lunn <and...@lunn.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
