On Fri, Jan 03, 2014 at 12:48:26AM +0000, Marius Silaghi wrote:
> Thanks
> Running 3.12.4
>
> During the holiday I managed to solve my problem with the following small patch (could it be added to the mainstream kernel such that it would be solved when we upgrade to the future kernels?):
Hi Marius,
Please try the patch I pointed you to instead of your patch. Dan's
patch may have the same impact yours does, and I need to know whether
his patch helps, since that's what's currently queued for the upcoming
3.14 kernel.
Sarah Sharp
>
> Signed-off-by: Marius C Silaghi <msilaghi@xxxxxxx>
> ---
> --- linux/drivers/usb/core/hub.c.orig 2013-12-23 22:09:50.545093470 -0500
> +++ linux/drivers/usb/core/hub.c 2013-12-23 22:29:40.521043702 -0500
> @@ -4197,7 +4197,19 @@ hub_port_init (struct usb_hub *hub, stru
> break;
> }
>
> - retval = usb_get_device_descriptor(udev, 8);
> + /* Try first the old 8-byte query (since it may be expected
> + * by some devices), but then give at least a chance to the
> + * new form (retrieving the whole descriptor)!
> + * Querying the content of the whole structure is required
> + * for older USB2 video cameras which do not support partial
> + * descriptor queries, like the STC-XXXUSB family.
> + * Windows also supports them.
> + */
> + if (USE_NEW_SCHEME(retry_counter))
> + retval = usb_get_device_descriptor(udev, 8);
> + else
> + retval = usb_get_device_descriptor(udev,
> + sizeof(struct usb_device_descriptor));
> if (retval < 8) {
> if (retval != -ENODEV)
> dev_err(&udev->dev,--
>
> ________________________________________
> From: Sarah Sharp [sarah.a.sharp@xxxxxxxxxxxxxxx]
> Sent: Thursday, January 02, 2014 19:24
> To: Marius Silaghi
> Cc: linux-usb-owner@xxxxxxxxxxxxxxx
> Subject: Re: xHCI driver Bug report (Babble reported at enumeration for cam that works in Windows)
>
> On Sat, Dec 21, 2013 at 04:40:21PM +0000, Marius Silaghi wrote:
> >
> Hi Marius,
>
> > There is a bug in xHCI. The camera STC-MC33USB that is recognized on the same computer&port with Windows fails to be enumerated with Babble (-75).
> >
> > I recompiled the kernel with DEBUG on for XHCI and DEBUG_USB.
> >
> > I attach the following files:
> > - dmesg_cam_connect (cat /proc/kmsg output during plugging the USB connector)
> > - dmesg_cam_disconnect_and_poll (cat /proc/kmsg during a normal xhci ring poll and then a camera usb unplugging)
> > -lsusb_ehci_Sentech (lsusb -v on a system with ahci where the camera is recognized)
> > -lsusb_ehci_nothing (lsusb -v on the same system with ahci with nothing plugged in)
> > -lsusb_xhci_Sentech (lsusb -v on the system with xhci where the camera is recognized)
> > -lsusb_xhci_nothing (lsusb -v on the same system with xhci with nothing plugged in)
>
> Thanks for the bug report. Which kernel version are you running?
>
> I think this issue might be fixed in a patch that's queued for the 3.14
> kernel. Can you apply the following patch to 3.13-rc6 and see if it
> helps?
>
> http://marc.info/?l=linux-usb&m=138672064109890&w=2
>
> If you need directions on how to compile a custom kernel, please see
> http://kernelnewbies.org/KernelBuild
>
> Sarah Sharp
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