Re: usb device getting disconnected

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> [160549.977524] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 3^M
> [160549.977528] hub 2-1:1.0: port 4, status 0100, change 0001, 12 Mb/s^M
> [160549.977650] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 4^M
> [160549.977652] usb 2-1.4: USB disconnect, address 3^M
> [160549.977654] usb 2-1.4: unregistering device^M
> [160549.977656] usb 2-1.4: unregistering interface 2-1.4:1.0^M
> [160549.977772] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 5^M
> [160549.977897] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 6^M
> [160549.978020] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 7^M
> [160549.978146] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 8^M
> [160549.978269] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 9^M
> [160549.978394] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 10^M
> [160549.978519] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 11^M
> [160549.978644] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 12^M
> [160549.978770] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 13^M
> [160549.978894] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 14^M
> [160549.979018] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 15^M
> [160549.979144] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 16^M
> [160549.979269] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 17^M
> [160549.979393] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 18^M
> [160549.979517] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 19^M
> [160549.979642] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 20^M
> [160549.979768] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 21^M
> [160549.979892] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 22^M
> [160549.980016] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 23^M
> [160549.980142] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 24^M
> [160549.980266] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 25^M
> [160549.980391] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 26^M
> [160549.980516] ehci_hcd 0000:00:1d.0: detected XactErr len 0/4096 retry
> 27^M
>
>
> Regards,
> Shaiju.
>
>
> -----Original Message-----
> From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx]
> Sent: Sunday, July 29, 2012 2:54 PM
> To: shaiju shaiju
> Cc: 'Sadasivan Shaiju'; 'Peter Chen'; 'USB list'
> Subject: RE: usb device getting disconnected and connect back again.
>
> On Sun, 29 Jul 2012, shaiju shaiju wrote:
>
>> Hi  Alen,
>>
>> This  error  is  intermittent  .  It  doesn't  happen  always .
>
> Then there may not be any way to determine the cause.  Perhaps the
> firmware in the USB device intermittently crashes.
>
If the host has some errors, such like the PHY work abnormal, it will also
occur errors like this. It is hard to debug your problem, I suggestion try more
boards and do more tests to see if it is single board issue or the
issues for all
boards.



> Alan Stern
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