Hi Jonathan, On Wednesday 10 December 2008, Jonathan Roberts wrote: > All, > > I have UVC (the latest version in SVN)
The SVN repository is outdated, you might consider upgrading to the version available in the Mercurial repository. > running on a TI OMAP3 EVM with a Quickcam Pro 9000 camera. Everything seems > to work as expected when capturing MJPEG (All supported resolutions) or low > (QVGA or lower) resolution YUYV video. However if I try and capture YUYV at > 640x480 then I get the following error message: > > uvcvideo: Failed to submit URB 0 (-90) > VIDIOC_STREAMON error 90, Message too long. > > As far as I can see this this message is being raised by the core USB driver > in usb_submit_urb() (urb.c). Is this a known problem? I really need to get > 640x480 support working so any help would be appreciated. -90 (-EMSGSIZE) can mean the following: (a) endpoint maxpacket size is zero; it is not usable in the current interface altsetting. (b) ISO packet is larger than the endpoint maxpacket. (c) requested data transfer length is invalid: negative or too large for the host controller. I'd vote for (c). Are you using the MUSB driver ? It doesn't support high bandwidth yet (see musb_urb_enqueue in drivers/usb/musb/musb_host.c, line 1805 in 2.6.27). There's not much I can that about that. High bandwidth support must be added to the MUSB driver. A possible workaround would be to use MJPEG at 640x480. Best regards, Laurent Pinchart _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
