simon@xxxxxxxxxxxxxx wrote:
> Hi I am using a v4l2 usb video capturer (em28xx based), and it is working
> fine for around 5 minutes. However, it stops capturing after this time.
>
> There is no error message sent to kmsg ot the application, which
> apparently waits for more data to be received.
>
> The debug dump from usbmon is:
>
<snip usbmon dump>
>
> I am using kernel 2.6.34-rc7, and now the E messages are shown. In kernels
> 2.6.33 and 2.6.32 the bus went on sending callbacks with 0s.
> I assume that there is still some work in progress on the ehci module, and
> eventually this issue will be solved.
>
> Also, when I stop the application the following message is shown:
>
> em28xx #0: cannot change alternate number to 0 (error=-110)
>
Which processor and which board are you running this on? What is the
transceiver you are using? (We had issues due to inadequate capacitance
on some power rails, and poor board design). This could be one source
of your problem.
Then again, you might be hitting an OMAP errata.
Are you able to use the device after you load the EHCI module again?
- Anand
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