Hi Felipe,
On Friday 23 Sep 2016 10:49:57 Felipe Balbi wrote:
> Bin Liu <[email protected]> writes:
> > +Fengwei Yin per his request.
> >
> > On Thu, Sep 22, 2016 at 10:48:40PM +0300, Felipe Balbi wrote:
> >> Bin Liu <[email protected]> writes:
> >>
> >> [...]
> >>
> >>>> Here's one that actually compiles, sorry about that.
> >>>
> >>> No worries, I was sleeping ;-)
> >>>
> >>> I will test it out early next week. Thanks.
> >>
> >> meanwhile, how about some instructions on how to test this out myself?
> >> How are you using g_webcam and what are you running on host side? Got a
> >> nice list of commands there I can use? I think I can get to bottom of
> >> this much quicker if I can reproduce it locally ;-)
> >
> > On device side:
> > - first patch g_webcam as in my first email in this thread to enable
> >
> > 640x480@30fps;
> >
> > - # modprobe g_webcam streaming_maxpacket=3072
> > - then run uvc-gadget to feed the YUV frames;
> >
> > http://git.ideasonboard.org/uvc-gadget.git
>
> as is, g_webcam never enumerates to the host. It's calls to
> usb_function_active() and usb_function_deactivate() are unbalanced. Do
> you have any other changes to g_webcam?
>
> Also, uvc-gadget.git doesn't compile, had to modify it a bit:
>
> -#include "../drivers/usb/gadget/uvc.h"
> +#include "../drivers/usb/gadget/function/uvc.h"
>
> Also fixed a build warning:
>
> @@ -732,6 +732,8 @@ int main(int argc, char *argv[])
> fd_set wfds = fds;
>
> ret = select(dev->fd + 1, NULL, &wfds, &efds, NULL);
> + if (ret < 0)
> + return ret;
> if (FD_ISSET(dev->fd, &efds))
> uvc_events_process(dev);
> if (FD_ISSET(dev->fd, &wfds))
>
> Laurent, have you tested g_webcam recently? What's the magic to get it
> working?
I'm afraid not, I haven't had time to work on UVC gadget for a few years now.
> Here's what I get out of dmesg:
>
> [ 58.568380] usb 1-9: new high-speed USB device number 5 using xhci_hcd
> [ 58.738680] usb 1-9: New USB device found, idVendor=1d6b, idProduct=0102
> [ 58.738683] usb 1-9: New USB device strings: Mfr=1, Product=2,
> SerialNumber=0 [ 58.738685] usb 1-9: Product: Webcam gadget
> [ 58.738687] usb 1-9: Manufacturer: Linux Foundation
> [ 58.739133] g_webcam gadget: high-speed config #1: Video
> [ 58.739138] g_webcam gadget: uvc_function_set_alt(0, 0)
> [ 58.739139] g_webcam gadget: reset UVC Control
> [ 58.739149] g_webcam gadget: uvc_function_set_alt(1, 0)
> [ 58.804369] uvcvideo: Found UVC 1.00 device Webcam gadget (1d6b:0102)
> [ 58.804479] g_webcam gadget: uvc_function_set_alt(1, 0)
> [ 64.188459] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported.
> Enabling workaround. [ 69.307458] uvcvideo: Failed to query (129) UVC
> probe control : -110 (exp. 26). [ 69.307459] uvcvideo: Failed to
> initialize the device (-5).
> [ 69.307505] usbcore: registered new interface driver uvcvideo
> [ 69.307506] USB Video Class driver (1.1.1)
> [ 146.646012] ------------[ cut here ]------------
> [ 146.646023] WARNING: CPU: 0 PID: 2616 at
> drivers/usb/gadget/composite.c:371 usb_function_activate+0x77/0x80
> [libcomposite] [ 146.646024] Modules linked in: uvcvideo g_webcam
> usb_f_uvc videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core
> videodev libcomposite kvm_intel kvm psmouse e1000e input_leds hid_generic
> usbhid atkbd irqbypass evdev [ 146.646054] CPU: 0 PID: 2616 Comm:
> gst-launch-1.0 Not tainted
> 4.8.0-rc7-next-20160922-00004-gc71031593917-dirty #20 [ 146.646055]
> Hardware name: Intel Corporation Skylake Client platform/Skylake Y LPDDR3
> RVP3, BIOS SKLSE2R1.R00.B097.B02.1509020030 09/02/2015 [ 146.646058]
> ffffc9000769bb70
> [ 146.646059] ffffffff8132d415
> [ 146.646060] 0000000000000000
> [ 146.646061] 0000000000000000
>
> [ 146.646063] ffffc9000769bbb0
> [ 146.646063] ffffffff8105ec1b
> [ 146.646064] 000001730769bb90
> [ 146.646066] 00000000ffffffea
> [ 146.646070] ffff88016c03a150
> [ 146.646072] 0000000000000282 ffff88016d793000 ffffc9000769befc
> [ 146.646077] Call Trace:
> [ 146.646086] [<ffffffff8132d415>] dump_stack+0x68/0x93
> [ 146.646090] [<ffffffff8105ec1b>] __warn+0xcb/0xf0
> [ 146.646095] [<ffffffff8105ed0d>] warn_slowpath_null+0x1d/0x20
> [ 146.646099] [<ffffffffa03f1ea7>] usb_function_activate+0x77/0x80
> [libcomposite] [ 146.646105] [<ffffffffa044a6de>]
> uvc_function_connect+0x1e/0x40 [usb_f_uvc] [ 146.646110]
> [<ffffffffa044b2ae>] uvc_v4l2_open+0x6e/0x80 [usb_f_uvc] [ 146.646116]
> [<ffffffffa04014f0>] v4l2_open+0xa0/0x100 [videodev] [ 146.646121]
> [<ffffffff811a5431>] chrdev_open+0xa1/0x1d0
> [ 146.646125] [<ffffffff811a5390>] ? cdev_put+0x30/0x30
> [ 146.646129] [<ffffffff8119dd60>] do_dentry_open.isra.17+0x150/0x2e0
> [ 146.646133] [<ffffffff8119f115>] vfs_open+0x45/0x60
> [ 146.646137] [<ffffffff811af1ed>] path_openat+0x62d/0x1370
> [ 146.646141] [<ffffffff811b0094>] ? putname+0x54/0x60
> [ 146.646146] [<ffffffff811b10ce>] do_filp_open+0x7e/0xe0
> [ 146.646150] [<ffffffff81083868>] ? preempt_count_sub+0x48/0x70
> [ 146.646154] [<ffffffff816f07d6>] ? _raw_spin_unlock+0x16/0x30
> [ 146.646160] [<ffffffff811bf009>] ? __alloc_fd+0xc9/0x180
> [ 146.646164] [<ffffffff8119f4e3>] do_sys_open+0x123/0x200
> [ 146.646170] [<ffffffff8119f5de>] SyS_open+0x1e/0x20
> [ 146.646174] [<ffffffff816f0e2a>] entry_SYSCALL_64_fastpath+0x18/0xa8
> [ 146.646177] ---[ end trace 1a4f7b9817d19b04 ]---
> [ 146.646180] g_webcam gadget: UVC connect failed with -22
> [ 146.653808] usb 1-9: USB disconnect, device number 5
> [ 146.653986] g_webcam gadget: UVC disconnect failed with -110
[snip]
> uvc-gadget keeps printing this error message:
>
> 159 if ((ret = ioctl(dev->fd, VIDIOC_DQBUF, &buf)) < 0) {
> 160 printf("Unable to dequeue buffer: %s (%d).\n",
> strerror(errno), 161 errno);
> 162 return ret;
> 163 }
>
> Any ideas?
The UVC gadget driver uses videobuf2 for buffer management. You can raise the
debug level of the videobuf2-v4l2 and videobuf2-core modules to get verbose
error messages in the kernel log.
--
Regards,
Laurent Pinchart
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