Am 04.01.2013 14:20, schrieb Roger Quadros: > Hi Gary, > > On 01/04/2013 02:20 PM, Gary Thomas wrote: >> >> On Thursday, January 3, 2013 9:21:19 AM UTC-7, Felipe Balbi wrote: >> >> Hi, >> >> On Wednesday, January 2, 2013 10:44:50 PM UTC+2, Gary Thomas wrote: >> >> I have a video adapter attached to my EHCI port which runs full >> speed (480Mb/s) isochronous mode. Sadly, I never get any data >> from the device (it uses the EM28xx driver). >> This same device + driver works fine on my laptop and from what >> I can tell looking at the module debug, it's failing when >> waiting for the ISOC frame data to arrive. >> >> Should this work? I recall lots of discussion in the past about >> ISOC transfers not working on certain OMAP devices... >> >> >> which kernel are you using ? Have you tested mainline kernel ? >> >> >> I'm using the TI/Ubuntu kernel ( ti-ubuntu-3.4.0-1489.17) >> >> Using the mainline would be hard as there is a lot in this kernel that >> isn't in the mainline.
I have added support for USB bulk transfers to the em28xx driver recently. It will be include in kernels 3.9+. Maybe it can be used to work around hardware problems with ISOC transfers. So if your device has bulk endpoints for video (see lsusb -v), it's probably worth testing the latest code from the media tree (http://git.linuxtv.org/media_tree.git). You will have to load the module with parameter usb_xfer_mode=1, otherwise the driver selects ISOC transfers for TV devices by default. Regards, Frank -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
