Re: [PATCH v2] usb: host: xhci: Enable XHCI_SPURIOUS_SUCCESS for allcontrollers with xhci 1.0

[Shuduo Sang]

On Thu, Jul 25, 2013 at 12:30 AM, Sarah Sharp
<sarah.a.sharp@xxxxxxxxxxxxxxx> wrote:
> On Mon, Jul 22, 2013 at 03:58:19PM +0800, Shuduo Sang wrote:
>> On Mon, Jul 22, 2013 at 3:23 PM, George Cherian <george.cherian@xxxxxx> wrote:
>> Yes, I run below script to capture picture.
>>
>> #!/bin/bash
>> # camera_stress.sh
>> # Testing the camera by BinLi
>>
>> for ((i=0; i<10 ; i++))
>> do
>>         fswebcam --no-banner -r 352x288 -d /dev/video0 test_$i.jpg
>> done
>>
>> It will randomly fail at later loops. The fail rate about 20%~30%. When it fail,
>> I can see error messages by dmesg as below:
>>
>> [ 68.171039] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr
>> not part of current TD
>> [ 68.175030] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr
>> not part of current TD
>> [ 68.179026] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr
>> not part of current TD
>> [ 68.180082] usb 3-12: USB disconnect, device number 4
>> [ 68.450459] usb 3-12: new high-speed USB device number 5 using xhci_hcd
>> [ 68.477960] usb 3-12: New USB device found, idVendor=5986, idProduct=0397
>> [ 68.477964] usb 3-12: New USB device strings: Mfr=1, Product=2, SerialNumber=0
>> [ 68.477966] usb 3-12: Product: Integrated Camera
>> [ 68.477968] usb 3-12: Manufacturer: Vimicro corp.
>> [ 68.479107] uvcvideo: Found UVC 1.00 device Integrated Camera (5986:0397)
>> [ 68.479821] input: Integrated Camera as
>> /devices/pci0000:00/0000:00:14.0/usb3/3-12/3-12:1.0/input/input15
>> [ 321.389721] type=1400 audit(1374214638.182:29): apparmor="DENIED"
>> operation="capable" parent=1 profile="/usr/sbin/cupsd" pid=1232
>> comm="cupsd" pid=1232 comm="cupsd" c
>> apability=36 capname="block_suspend"
>
> That's a different issue.  The log shows that your USB webcam
> disconnects, and that's why your script fails.  Then the device
> re-connects.
>

Hmm, I think you are right. I tried my script on another laptop with
Lynx Point host and same webcam, it works very well. Sorry if my
information misled you and George.

> Do other USB devices work after the camera disconnects?  Does the webcam
> itself work (at least for a while) after you stop and restart the
> script?  (Note that after a disconnect, the webcam may be present on
> /dev/video1 instead of /dev/video0, because your script had /dev/video0
> open when the webcam re-connected.)
>
>> >> Then I manually applied George's patch against 3.10.0 but the issue
>> >> still happen when I use
>> >> camera to capture picture.
>> >
>> > Can you explain what is the exact issue you face after applying the patch?
>> > Are you still getting
>> >
>> > "ERROR Transfer event TRB DMA ptr not part of current TD"
>>
>> Yes, after I applied your patch manually, I still getting this error.
>> Seems fail rate is same.
>
> I'm still going to apply George's patch, because it does fix a different
> issue.
>

Is there any code piece to triage the issue George's patch fix? Then I can
do some verification with George's patch or without.

> I'm not sure if there's anything software can do if the webcam keeps
> disconnecting.  That's usually an electrical issue.  Have you tried a
> different USB cable?  If the webcam is behind a hub, have you tried
> connecting it directly to the computer's roothub?  If it's attached to
> the roothub, have you tried putting it behind an external hub?
>
> If none of that works, I can look at your logs, and try to figure out if
> there's anything software can do.  Can you recompile your kernel with
> George's patch and CONFIG_USB_DEBUG and CONFIG_USB_XHCI_HCD_DEBUGGING
> turned on?  Please send me the log from just before you start your
> script to when the device disconnects.
>
> Sarah Sharp
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