USB Disconnect in Beagleboard C4 after suspend resume

GoogleGroups
1

I am using Angstrom in my beagleboard. Kernel is taken from linux-omap-
pm 2.6.35-rc3.

I have connected a USB Ethernet to the board. The board is powered via
5V port.

The Ethernet port stops working If I suspend and resume my
beagleboard,

[ 1103.120849] PM: resume of devices complete after 387.786 msecs

[ 1103.376251] Restarting tasks ...

[ 1103.379669] usb 1-2: USB disconnect, address 2

[ 1103.411315] done.

[ 1103.445892] usb 1-2.4: USB disconnect, address 3

[ 1103.450836] asix 1-2.4:1.0: eth0: unregister 'asix' usb-ehci-omap.
0-2.4, ASIX AX88772 USB 2.0 Ethernet

It doesnot work even if I disconnect and reconnect the USB. I think
some problem with EHCI.
Is there any workaround for this issue? Any suggestions will be highly
helpful..
Thanks
Pradeep

2

Take a look at the erratta on the processor. Suspend and resume does not work on the EHCI port. You can also do a search on the email list on this topic as well.

Gerald

3

Hello Gerald, Thanks for your time.

I went through erratta and the group. This problem seems to happen
with Beagleboard C3. But mine is C4.
Please correct me if I am wrong.

Thanks
Pradeep

4

I am not talking about the board errata. I am talking about the processor errata. Suspend and resume is not supported on the processor.

Gerald

5

Here is the link.

http://focus.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=sprz319b&fileType=pdf

Gerald

6

Hello Gerald,

Thanks a lot for the link. The workarounds looks very complex to me.

Is this issue fixed in Beagleboard xM?

Thanks
Pradeep.

7

It is my understanding that the next revision of silicon will take care of that, but I have no confirmation of that. The Beagleboard-xM rev C will have the latest silicon.

Gerald