On Fri, 15 Jul 2011, Ming Lei wrote: > Hi, > > On Fri, Jul 15, 2011 at 10:27 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > This is fine with me. �However, it is strange that the Set-Interface > > request is necessary. �After being reset, the device should > > automatically be in altsetting 0 for all interfaces. > > For uvc devices, seems it is not strange, see uvc_video_init(), which > is called in .probe path and executes Set-Interface 0 first, then starts > to get/set video control. I see what you mean. Apparently other UVC devices also need to receive a Set-Interface(0) request before they will work right. (It's still strange, though...) Anyway, since the driver does this during probe, it makes sense to do it during reset-resume as well. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
