Hi Jean-Philippe, On Wednesday 06 March 2013 14:21:14 jean-philippe francois wrote: > Hi, > > The company I work for is doing USB cameras, for which > I wrote the drivers (out of tree). Just out of curiosity, was there any shortcoming in the UVC specification that pushed your company to implementing a vendor protocol ? > Raw camera data are transferred using isochronous transfer. > > However when plugging the camera on an USB3 port, xhci spits the > following messages on URB submission : > > [ 1704.989785] xhci_hcd 0000:01:00.0: ERROR Transfer event TRB DMA ptr > not part of current TD > > I submit 4 urbs, each containing 16 ISO frames, and have 61 or 62 > messages in the dmesg output. > > In addition, stopping the stream definitely confuse the driver or > chip, which is considered dead by the usb core (cf logs). > > USB3 host is an asmedia ASM1042. > > Please find attached the dmesg output, and the output of lsusb -v for > the device. > > This is with 3.8.2 opensuse Kernel Of The Day > > Regards, > Jean-Philippe François > > PS : I am not subscribed to the list, can I be cc'ed in the reply ? -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
