Re: [PATCH] ARM: shmobile: Lager: add Micrel KSZ8041 PHY fixup

On Fri, Sep 13, 2013 at 5:29 PM, Sergei Shtylyov
[off-list ref] wrote:

Currently on the Lager board NFS timeouts/delays are seen when booting.  That
turned out to happen because the SoC's ETH_LINK signal turns on and off after
each packet.  It is connected to Micrel KSZ8041 PHY's LED0 signal. Ether LEDs
on the Lager board are named LINK and ACTIVE which corresponds to non-default
01 setting of the PHY control register 1 bits 14-15. The 'sh_eth' driver resets
the PHY when opening the network device, so we have to set the mentioned bits
back to 01 from the default 00 value which causes bouncing of ETH_LINK.  That
can be achieved using the PHY platform fixup mechanism if we also modify the
driver to use it..

Signed-off-by: Sergei Shtylyov <redacted>

Hi Sergei,

Thanks for your efforts on this. Nice to see that Ethernet for Lager
board support is improving.

Can you please share with us with link speeds you tested? I suspect
that this patch is only needed for some case, like for instance 100
MBit Full Duplex. Fixing the PHY settings makes sense even though only
a single mode needs it, but knowing which link speeds that are known
to work would help a lot.

Cheers,

/ magnus