Hi,
I'm having a hard time to figure out how to get g_webcam working with
the tip of http://git.ideasonboard.org/uvc-gadget.git
Platform I'm using is dra7-evm with dwc3 controller.
At first things just lock up the moment I load g_webcam.
To fix the deadlock
------------------------ drivers/usb/gadget/composite.c ------------------------
index 76883ff4f5bb..b2ff1cdf9850 100644
@@ -348,8 +348,12 @@ int usb_function_deactivate(struct usb_function *function)
spin_lock_irqsave(&cdev->lock, flags);
- if (cdev->deactivations == 0)
+ if (cdev->deactivations == 0) {
+ spin_unlock_irqrestore(&cdev->lock, flags);
status = usb_gadget_deactivate(cdev->gadget);
+ spin_lock_irqsave(&cdev->lock, flags);
+ }
+
if (status == 0)
cdev->deactivations++;
After that g_webcam probes fine.
# modprobe g_webcam
[ 41.510915] g_webcam gadget: uvc: uvc_function_bind()
[ 41.516604] g_webcam gadget: Webcam Video Gadget
[ 41.521282] g_webcam gadget: g_webcam ready
Then,
./uvc-gadget -i 640x480.jpg
./uvc-gadget: invalid option -- 'i'
Invalid option '-?'
Usage: ./uvc-gadget [options] <uvc device>
Available options are
-c device V4L2 source device
-h Print this help screen and exit
-i image MJPEG image
So I plugged in a USB webcam on another USB port on the EVM to get a V4L2 source.
Then,
./uvc-gadget -c /dev/video2
Device /dev/video2 opened: dwc3-gadget (gadget).[ 135.997771] ------------[ cut here ]------------
[ 136.006581] WARNING: CPU: 0 PID: 254 at drivers/usb/gadget/composite.c:383 usb_function_activate+0x70/0x80 [libcomposite]
[ 136.017583] Modules linked in: usb_f_uvc g_webcam usb_f_ss_lb libcomposite uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_usb_audio videodev snd_hwdep snd_usbmidi_lib snd_raw]
[ 136.076634] CPU: 0 PID: 254 Comm: uvc-gadget Tainted: G W 5.4.0-rc1-00006-g0dd2ed53dd86 #488
[ 136.086416] Hardware name: Generic DRA74X (Flattened Device Tree)
[ 136.092549] [<c01128c0>] (unwind_backtrace) from [<c010cae0>] (show_stack+0x10/0x14)
[ 136.100334] [<c010cae0>] (show_stack) from [<c08b76e4>] (dump_stack+0xb4/0xd4)
[ 136.107595] [<c08b76e4>] (dump_stack) from [<c013a2f4>] (__warn+0xd0/0xf8)
[ 136.114505] [<c013a2f4>] (__warn) from [<c013a3c4>] (warn_slowpath_fmt+0xa8/0xb8)
[ 136.122031] [<c013a3c4>] (warn_slowpath_fmt) from [<bf21cef8>] (usb_function_activate+0x70/0x80 [libcomposite])
[ 136.132187] [<bf21cef8>] (usb_function_activate [libcomposite]) from [<bf28f064>] (uvc_function_connect+0x10/0x40 [usb_f_uvc])
[ 136.143676] [<bf28f064>] (uvc_function_connect [usb_f_uvc]) from [<bf28fa00>] (uvc_v4l2_open+0x54/0x68 [usb_f_uvc])
[ 136.154196] [<bf28fa00>] (uvc_v4l2_open [usb_f_uvc]) from [<bf1ef4f0>] (v4l2_open+0x74/0x104 [videodev])
[ 136.163748] [<bf1ef4f0>] (v4l2_open [videodev]) from [<c02bf5e4>] (chrdev_open+0xd8/0x1ac)
[ 136.172053] [<c02bf5e4>] (chrdev_open) from [<c02b6f3c>] (do_dentry_open+0x22c/0x40c)
[ 136.179922] [<c02b6f3c>] (do_dentry_open) from [<c02ca4b4>] (path_openat+0x2a4/0x13e8)
[ 136.187879] [<c02ca4b4>] (path_openat) from [<c02cc750>] (do_filp_open+0x6c/0xdc)
[ 136.195400] [<c02cc750>] (do_filp_open) from [<c02b844c>] (do_sys_open+0x168/0x218)
[ 136.203093] [<c02b844c>] (do_sys_open) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 136.210867] Exception stack(0xebe37fa8 to 0xebe37ff0)
[ 136.215942] 7fa0: b6f3c000 b6f68968 ffffff9c 0044c4b0 00000802 00000000
[ 136.224158] 7fc0: b6f3c000 b6f68968 0044c618 00000142 0044c860 00000000 0044c690 00000000
[ 136.232369] 7fe0: 00000142 beab08c8 b6ed4155 b6e5d746
[ 136.237443] ---[ end trace e1f69be15299b4fd ]---
[ 136.242153] g_webcam gadget: uvc: UVC connect failed with -22
This is one more issue, but uvc-gadget is unaware of it looks like.
Device /dev/video2 opened: dwc3-gadget (gadget).
[ 136.519585] g_webcam gadget: high-speed config #1: Video
[ 136.524929] g_webcam gadget: uvc: uvc_function_set_alt(0, 0)
[ 136.530612] g_webcam gadget: uvc: reset UVC Control
[ 136.535523] g_webcam gadget: uvc: uvc_function_set_alt(1, 0)
bRequestType a1 bRequest 86 wValue 0200 wIndex 0100 wLength 0001[ 136.542291] g_webcam gadget: uvc: uvc_function_set_alt(1, 0)
control request (req 86 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 86 wValue 0200 wIndex 0200 wLength 0001
control request (req 86 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 87 cs 01)
bRequestType 21 bRequest 01 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 01 cs 01)
setting probe control, length = 26
bRequestType a1 bRequest 81 wValue 0100 wIndex 0001 wLength 001a
streaming request (req 81 cs 01)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
bRequestType a1 bRequest 87 wValue 0200 wIndex 0200 wLength 0002
control request (req 87 cs 02)
bRequestType a1 bRequest 81 wValue 0200 wIndex 0000 wLength 0001
control request (req 81 cs 02)
Now after starting guvcview -d /dev/video2
[ 205.340393] g_webcam gadget: uvc: reset UVC
streaming request (req 01 cs 02)
setting commit control, leng[ 205.344662] ------------[ cut here ]------------
th = 26
Setting format to 0x47504a4d 640x360
=== Setting frame[ 205.354897] WARNING: CPU: 1 PID: 254 at drivers/media/common/videobuf2/videobuf2-core.c:738 vb2_core_reqbufs+0x1a8/0x46c [videobuf2_common]
rate to 15 fps
/dev/video2: unable to set frame rate (25).
St[ 205.373018] Modules linked in: usb_f_uvc g_webcam usb_f_ss_lb libcomposite uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common snd_usb_audio videodev snd_hwdep snd_usbmidi_lib snd_r]
arting video stream.
[ 205.437574] CPU: 1 PID: 254 Comm: uvc-gadget Tainted: G W 5.4.0-rc1-00006-g0dd2ed53dd86 #488
[ 205.449247] Hardware name: Generic DRA74X (Flattened Device Tree)
[ 205.455380] [<c01128c0>] (unwind_backtrace) from [<c010cae0>] (show_stack+0x10/0x14)
[ 205.463165] [<c010cae0>] (show_stack) from [<c08b76e4>] (dump_stack+0xb4/0xd4)
[ 205.470428] [<c08b76e4>] (dump_stack) from [<c013a2f4>] (__warn+0xd0/0xf8)
[ 205.477337] [<c013a2f4>] (__warn) from [<c013a3c4>] (warn_slowpath_fmt+0xa8/0xb8)
[ 205.484860] [<c013a3c4>] (warn_slowpath_fmt) from [<bf270b34>] (vb2_core_reqbufs+0x1a8/0x46c [videobuf2_common])
[ 205.495125] [<bf270b34>] (vb2_core_reqbufs [videobuf2_common]) from [<bf28f2c8>] (uvcg_alloc_buffers+0xc/0x18 [usb_f_uvc])
[ 205.506254] [<bf28f2c8>] (uvcg_alloc_buffers [usb_f_uvc]) from [<bf1f5254>] (__video_do_ioctl+0x1c4/0x464 [videodev])
[ 205.516951] [<bf1f5254>] (__video_do_ioctl [videodev]) from [<bf1f70cc>] (video_usercopy+0x228/0x694 [videodev])
[ 205.527196] [<bf1f70cc>] (video_usercopy [videodev]) from [<c02cf520>] (do_vfs_ioctl+0x98/0x938)
[ 205.536023] [<c02cf520>] (do_vfs_ioctl) from [<c02cfe24>] (ksys_ioctl+0x64/0x74)
[ 205.543453] [<c02cfe24>] (ksys_ioctl) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 205.551141] Exception stack(0xebe37fa8 to 0xebe37ff0)
[ 205.556215] 7fa0: 00000000 0044c5b0 00000003 c0145608 beab0774 00000002
[ 205.564431] 7fc0: 00000000 0044c5b0 00000000 00000036 00000004 beab0a90 beab0b20 beab0aa0
[ 205.572645] 7fe0: 0044b058 beab076c 00438ef7 b6edaf08
[ 205.577742] ---[ end trace e1f69be15299b4fe ]---
/dev/video2: unable to request buffers (22).
Failed to allocate source buffers: Invalid argument (22)
Any clues what I'm doing wrong here? Am I missing some Kconfig option?
As a sidenote, having uvc-gadget work without an external video source was great (e.g. jpg image or random video pattern).
Looks like that feature broke unintentionally?
What platform was g_webcam and uvc-gadget last tested with?
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
