MUSB problem

MUSB problem

[Gary Thomas]

I'm running 3.3.0 on an OMAP DM3730, with SMSC75xx connected
via the MUSB device.  I get this error continually although
the device (and network channel) seem happy:
   musb_ep_program 835: broken !rx_reinit, ep2 csr a200

What does it mean?  How do I fix it (i.e. keep it from happening)?

Note: disabling DMA isn't really an option as the whole point of
the SMSC75xx is to get gigabit ethernet and I doubt that's possible
without DMA :-)

Thanks for any pointers/ideas

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: MUSB problem

[Gary Thomas]

On 2012-04-25 06:19, Gary Thomas wrote:
> I'm running 3.3.0 on an OMAP DM3730, with SMSC75xx connected
> via the MUSB device. I get this error continually although
> the device (and network channel) seem happy:
> musb_ep_program 835: broken !rx_reinit, ep2 csr a200
>
> What does it mean? How do I fix it (i.e. keep it from happening)?
>
> Note: disabling DMA isn't really an option as the whole point of
> the SMSC75xx is to get gigabit ethernet and I doubt that's possible
> without DMA :-)
>
> Thanks for any pointers/ideas
>

Actually, I was too hasty saying that this worked even with this
error.  I can ping out from my board, but any higher level of traffic,
e.g. SSH into the box, falls over :-(

The problems vanish when I disable MUSB DMA.

What gives?

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------

Re: MUSB problem

[Joshua Emele]

> Actually, I was too hasty saying that this worked even with this
> error.  I can ping out from my board, but any higher level of traffic,
> e.g. SSH into the box, falls over 
> 
> The problems vanish when I disable MUSB DMA.
> 
> What gives?
> 

I'm also seeing this on a variety of kernels, from 2.6.34 to 3.3.0. I must 
explicitly set musb_hdrc.use_dma=n for the smsc95xx card to function.

The latest kernel I have tested this against is:
Linux WC-11003A 3.3.0 #1 PREEMPT Fri May 11 18:05:35 PDT 2012 armv7l GNU/Linux