mpc5200 fec error

[Eric Millbrandt]

-----Original Message-----
From: Grant Likely [mailto:grant.likely at secretlab.ca] 
Sent: Wednesday, May 20, 2009 12:49
To: Eric Millbrandt
Cc: Jon Smirl; Wolfram Sang; linuxppc-dev at ozlabs.org
Subject: Re: mpc5200 fec error

On Wed, May 20, 2009 at 10:41 AM, Eric Millbrandt
<emillbrandt at dekaresearch.com> wrote:
> It looks like the phy is never getting reset properly after the FEC_IEVENT_RFIFO_ERROR.  I threw some printk's into the fec mdio driver

Yes, that sounds familiar.  Most likely, the value of the MDIO bus
control register got clobbered and not reset when the FEC was reset.
Try adding this line to the beginning of mpc52xx_fec_mdio_transfer():

out_be32(&fec->mii_speed, 0x7e);

It's a dirty ugly hack, but it should help.  If that works, then I can
come up with a better solution.  Part of the problem is that the MDIO
handling in the current code really isn't very good.  I've got changes
queued up in -next which cleans it up quite a bit which should make it
easier to fix properly.

g.

That worked!  I'm still getting the fifo receive errors, but at least now the fec recovers.

[  127.761365] net eth0: FEC_IEVENT_RFIFO_ERROR 
[  129.274341] PHY: f0003000:00 - Link is Down
[  130.274266] PHY: f0003000:00 - Link is Up - 100/Full
[  134.955324] net eth0: FEC_IEVENT_RFIFO_ERROR
[  136.273959] PHY: f0003000:00 - Link is Down
[  137.274090] PHY: f0003000:00 - Link is Up - 100/Full
[  140.521462] net eth0: FEC_IEVENT_RFIFO_ERROR
[  142.273955] PHY: f0003000:00 - Link is Down
[  143.273954] PHY: f0003000:00 - Link is Up - 100/Full
[  148.471582] net eth0: FEC_IEVENT_RFIFO_ERROR
[  150.273984] PHY: f0003000:00 - Link is Down
[  151.273901] PHY: f0003000:00 - Link is Up - 100/Full

Thanks Grant.


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