Re: Kernel 2.6.22 some Logitech webcams

Hi Alan,

On Thursday 04 October 2007, Alan Stern wrote:
> On Thu, 4 Oct 2007, Laurent Pinchart wrote:
> > There are two ways to work around the problem. Either slow the USB stack
> > down to bring it to Windows' level, or get the uvcvideo driver to bind to
> > the video interface after the usbaudio driver has bound to the audio
> > interface.
> >
> > The first solution is obviously not possible (and far from desired
> > anyway), so I'm looking for a way to implement the second solution.
> >
> > The bad devices I work with have video interfaces and audio interfaces,
> > in that order. The USB stack thus tries to bind the video driver before
> > the audio driver.
> >
> > Starting at kernel 2.6.22, the patch I mentioned in my previous mail
> > triggers a bug in the device. I noticed that binding the usbaudio driver
> > before the uvcvideo driver works around the device bug. I'm thus looking
> > for a way to do this automatically, as the USB stack will bind drivers in
> > the USB interfaces order.
>
> One possibility is to have the uvcvideo probe routine check whether the
> audio interface is bound.  If it isn't, have the probe fail and start
> up a delayed workqueue routine to probe again 5 seconds later.  It's a
> nasty hack, but it ought to work.

Thanks for the tip. I'll try it.

Best regards,

Laurent Pinchart

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