g_webcam not work properly.
This is what i tried.
> sudo modprobe g_webcam
> v4l2-ctl --list-devices
dwc3-gadget (gadget):
/dev/video4
rkisp1-statistics (platform: rkisp1):
/dev/video2
/dev/video3
rkisp1_mainpath (platform:ff910000.rkisp1):
/dev/video0
/dev/video1
>dmesg
[ 55.350022] g_webcam gadget: uvc_function_bind
[ 55.354586] g_webcam gadget: Webcam Video Gadget
[ 55.355017] g_webcam gadget: g_webcam ready
> uvc-gadget -d -i ~/tmp/test.jpg -u /dev/video4
dmesg log
[ 59.752149] g_webcam gadget: UVC disconnect failed with -110
[ 77.700889] ------------[ cut here ]------------
[ 77.701315] WARNING: at drivers/usb/gadget/composite.c:327
[ 77.701803] Modules linked in: g_webcam usb_f_uvc libcomposite binfmt_misc bcmdhd ip_tables x_tables autofs4
[ 77.702885] CPU: 0 PID: 1225 Comm: uvc-gadget Not tainted 4.4.154-73-rockchip-00007-g155a65a #2
[ 77.703647] Hardware name: ROCK PI 4B (DT)
[ 77.704013] task: ffffffc0ed5d3800 task.stack: ffffffc0defd4000
[ 77.704569] PC is at usb_function_activate+0x3c/0x88 [libcomposite]
[ 77.705149] LR is at usb_function_activate+0x30/0x88 [libcomposite]
[ 77.705708] pc : [] lr : [] pstate: a00001c5
[ 77.706355] sp : ffffffc0defd7ab0
[ 77.706649] x29: ffffffc0defd7ab0 x28: ffffffc0ed5d3800
[ 77.707142] x27: 0000000000000000 x26: ffffffc0eec27000
[ 77.707634] x25: 0000000000000186 x24: ffffffc0e0389e00
[ 77.708126] x23: ffffff80092ee738 x22: ffffffc0dec2c000
[ 77.708618] x21: 0000000000000140 x20: ffffffc0e44e0e10
[ 77.709110] x19: ffffffc0e44e0d80 x18: 0000000000000000
[ 77.709602] x17: 0000000000000000 x16: ffffff800821ac2c
[ 77.710094] x15: 0000000000000000 x14: 0000000000011f94
[ 77.710586] x13: 00000000fff47464 x12: 0000000000000000
[ 77.711077] x11: 00000000fff474f4 x10: 00000000f774c000
[ 77.711569] x9 : 0000000000000000 x8 : ffffffc0dd04b600
[ 77.712060] x7 : 0000000000000000 x6 : 000000000000003f
[ 77.712552] x5 : 0000000000000040 x4 : 0000000000000000
[ 77.713043] x3 : 00000040eed09000 x2 : 00000000ffffffff
[ 77.713534] x1 : 00000040eed09000 x0 : 0000000000000000
[ 77.714026]
PC: 0xffffff8001060d0c:
[ 77.714470] 0d0c f9000001 d2802000 f2fbd5a0 f900167f f9005660 91040000 f9005a60 17ffffca
[ 77.715236] 0d2c 128002b5 17ffffe4 d503201f 01069838 ffffff80 01067d86 ffffff80 01067da8
[ 77.715999] 0d4c ffffff80 a9bd7bfd 910003fd a90153f3 f90013f5 aa0003f3 aa1e03e0 d503201f
[ 77.716763] 0d6c f9401660 f9401813 91024274 aa1403e0 95efd82d aa0003f5 b9408a60 35000160
[ 77.717527] 0d8c d4210000 128002b3 aa1503e1 aa1403e0 95efd872 f94013f5 2a1303e0 a94153f3
[ 77.718290] 0dac a8c37bfd d65f03c0 51000400 b9008a60 350000a0 f9400260 95df5038 2a0003f3
[ 77.719053] 0dcc 17fffff2 52800013 17fffff0 a9be7bfd 910003fd a90153f3 aa0103f3 aa0003f4
[ 77.719817] 0dec aa1e03e0 d503201f f9403a61 b4000061 aa1303e0 d63f0020 a94a8261 f9005e7f
[ 77.720582]
LR: 0xffffff8001060d00:
[ 77.721026] 0d00 36fffa80 a94a8261 f9000420 f9000001 d2802000 f2fbd5a0 f900167f f9005660
[ 77.721789] 0d20 91040000 f9005a60 17ffffca 128002b5 17ffffe4 d503201f 01069838 ffffff80
[ 77.722553] 0d40 01067d86 ffffff80 01067da8 ffffff80 a9bd7bfd 910003fd a90153f3 f90013f5
[ 77.723316] 0d60 aa0003f3 aa1e03e0 d503201f f9401660 f9401813 91024274 aa1403e0 95efd82d
[ 77.724080] 0d80 aa0003f5 b9408a60 35000160 d4210000 128002b3 aa1503e1 aa1403e0 95efd872
[ 77.724843] 0da0 f94013f5 2a1303e0 a94153f3 a8c37bfd d65f03c0 51000400 b9008a60 350000a0
[ 77.725607] 0dc0 f9400260 95df5038 2a0003f3 17fffff2 52800013 17fffff0 a9be7bfd 910003fd
[ 77.726370] 0de0 a90153f3 aa0103f3 aa0003f4 aa1e03e0 d503201f f9403a61 b4000061 aa1303e0
[ 77.727135]
SP: 0xffffffc0defd7a30:
[ 77.727578] 7a30 dec2c000 ffffffc0 092ee738 ffffff80 e0389e00 ffffffc0 00000186 00000000
[ 77.728341] 7a50 eec27000 ffffffc0 00000000 00000000 ed5d3800 ffffffc0 defd7ab0 ffffffc0
[ 77.729105] 7a70 01060d80 ffffff80 defd7ab0 ffffffc0 01060d8c ffffff80 a00001c5 00000000
[ 77.729868] 7a90 defd7ab0 ffffffc0 01060d80 ffffff80 00000000 00000080 e44e0e10 ffffffc0
[ 77.730632] 7ab0 defd7ae0 ffffffc0 010770dc ffffff80 dec2c000 ffffffc0 e44e0d80 ffffffc0
[ 77.731395] 7ad0 e0389e00 ffffffc0 dec2c000 ffffffc0 defd7b00 ffffffc0 01077e6c ffffff80
[ 77.732159] 7af0 dd04b540 ffffffc0 dec2c000 ffffffc0 defd7b30 ffffffc0 08885a64 ffffff80
[ 77.732922] 7b10 dec2c000 ffffffc0 092ee000 ffffff80 dec2c088 ffffffc0 e0389e00 ffffffc0
[ 77.733691]
X8: 0xffffffc0dd04b580:
[ 77.734135] b580 dd04b580 ffffffc0 dd04b580 ffffffc0 dd04b590 ffffffc0 dd04b590 ffffffc0
[ 77.734899] b5a0 dd04b5a0 ffffffc0 dd04b5a0 ffffffc0 00000000 ffffffff 00000000 00000000
[ 77.735662] b5c0 dec2c610 ffffffc0 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.736426] b5e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.737189] b600 00000000 00000000 081c77fc ffffff80 44656144 000003e8 000003e8 000003e8
[ 77.737953] b620 000003e8 000003e8 000003e8 000003e8 000003e8 00000000 00000000 00000000
[ 77.738716] b640 00000000 00000000 00000000 00000000 ffffffff 0000003f 00000000 00000000
[ 77.739480] b660 00000000 00000000 e464c200 ffffffc0 00000000 00000000 00000000 00000000
[ 77.740249]
X16: 0xffffff800821abac:
[ 77.740703] abac 540003c0 9100e3a1 aa1603e0 97feffa5 2a0003f3 37f80040 b9405fb3 f9402ba0
[ 77.741467] abcc b4000140 f94023a2 d503201f 52800001 91002000 f9000002 d503201f 35000161
[ 77.742231] abec b9405bb3 4b130293 36000075 aa1603e0 97febfd7 93407e60 a94153f3 a9425bf5
[ 77.742995] ac0c a8c67bfd d65f03c0 128001b3 17fffff7 928001a0 17fffff9 92800100 17fffff7
[ 77.743758] ac2c a9bd7bfd 910003fd a90153f3 f90013f5 aa0103f4 aa0203f5 aa0003f3 aa1e03e0
[ 77.744522] ac4c d503201f 2a1503e3 2a1403e2 aa1303e1 12800c60 97feb53a f94013f5 a94153f3
[ 77.745286] ac6c a8c37bfd d65f03c0 a9bd7bfd 910003fd a90153f3 a9025bf5 aa0003f3 aa0103f4
[ 77.746049] ac8c aa1e03e0 aa0203f5 aa0303f6 d503201f 2a1603e3 2a1503e2 aa1403e1 2a1303e0
[ 77.746815]
X19: 0xffffffc0e44e0d00:
[ 77.747270] 0d00 00000000 00000000 00000000 00000000 ffffffff 0000003f 00000000 00000000
[ 77.748034] 0d20 00000000 00000000 e464c200 ffffffc0 00000000 00000000 00000000 00000000
[ 77.748797] 0d40 00000000 00000000 00000000 00000000 de962980 ffffffc0 09216a88 ffffff80
[ 77.749561] 0d60 dd008180 ffffffc0 e44e08e8 ffffffc0 080bbe2c ffffff80 00000000 00000000
[ 77.750324] 0d80 ed043ab0 ffffffc0 e44e0f00 ffffffc0 00000000 00000000 00000000 00000000
[ 77.751088] 0da0 00000000 00000000 00000000 00000000 00000000 00000000 00011200 0102ef02
[ 77.751851] 0dc0 021d6b00 01040401 00000002 00000000 010900a8 ffffff80 010900a8 ffffff80
[ 77.752615] 0de0 e3469e00 ffffffc0 e3469e00 ffffffc0 01090150 ffffff80 00000007 00000000
[ 77.753380]
X20: 0xffffffc0e44e0d90:
[ 77.753824] 0d90 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.754588] 0db0 00000000 00000000 00011200 0102ef02 021d6b00 01040401 00000002 00000000
[ 77.755351] 0dd0 010900a8 ffffff80 010900a8 ffffff80 e3469e00 ffffffc0 e3469e00 ffffffc0
[ 77.756115] 0df0 01090150 ffffff80 00000007 00000000 00000000 00000000 00000000 00000000
[ 77.756878] 0e10 00080007 dead4ead 00000000 00000000 ed5d3800 ffffffc0 00000000 00000000
[ 77.757642] 0e30 00000000 00000000 00000000 00000000 00000000 dead4ead ffffffff 00000000
[ 77.758405] 0e50 ffffffff ffffffff e44e0e58 ffffffc0 e44e0e58 ffffffc0 0870ef04 ffffff80
[ 77.759168] 0e70 0870ef60 ffffff80 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.759934]
X22: 0xffffffc0dec2bf80:
[ 77.760389] bf80 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.761152] bfa0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.761916] bfc0 00000000 00000000 00000000 00000000 00000000 00000000 7379732f 2e6d6574
[ 77.762680] bfe0 63696c73 70612f65 61642d74 2d796c69 72677075 2e656461 76726573 00656369
[ 77.763443] c000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.764207] c020 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.764970] c040 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.765734] c060 00000000 00000000 00000000 00000000 00000000 00000000 0107e140 ffffff80
[ 77.766499]
X23: 0xffffff80092ee6b8:
[ 77.766954] e6b8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.767717] e6d8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.768481] e6f8 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.769244] e718 00000000 00000000 00000000 00000000 eebb7000 ffffffc0 0900d2c0 ffffff80
[ 77.770007] e738 00000001 00000000 00020002 dead4ead ffffffff 00000000 ffffffff ffffffff
[ 77.770771] e758 092ee758 ffffff80 092ee758 ffffff80 00000000 00000000 00000000 00000000
[ 77.771535] e778 08fe6bdb ffffff80 00000000 00000000 00000000 00000000 092ee7f8 ffffff80
[ 77.772299] e798 ee8801c0 ffffffc0 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.773064]
X24: 0xffffffc0e0389d80:
[ 77.773518] 9d80 00000000 00000000 00000000 00000000 defe2d80 ffffffc0 00000004 00000000
[ 77.774282] 9da0 00000008 00000008 00000020 00000000 00002035 00000000 00000000 00000000
[ 77.775046] 9dc0 00000000 00000000 00000000 00000000 e0389dd0 ffffffc0 e0389dd0 ffffffc0
[ 77.775810] 9de0 e0389de0 ffffffc0 e0389de0 ffffffc0 dfda7ad0 ffffffc0 ffffffff 7f7f7f7f
[ 77.776573] 9e00 00000000 00000000 00000000 00000000 ef19cc60 ffffffc0 dff17948 ffffffc0
[ 77.777337] 9e20 def178b0 ffffffc0 08d6d2f0 ffffff80 00000000 dead4ead ffffffff 00000000
[ 77.778101] 9e40 ffffffff ffffffff 00000001 00000000 00000802 0000001f 00000001 00000000
[ 77.778864] 9e60 00000000 dead4ead ffffffff 00000000 ffffffff ffffffff e0389e78 ffffffc0
[ 77.779630]
X26: 0xffffffc0eec26f80:
[ 77.780084] 6f80 ff7effff ff7fffff ff77ffff ffafffff ffefffff ff67ffff fff6ffff ffafffff
[ 77.780848] 6fa0 ff6effff ff657eff fffeffff ffec7fff ff74ffff ffe7ffff ff7fffff 7f67ff7f
[ 77.781612] 6fc0 ff3effff ffffffff ffe7ffff fff7ffff ff6effff fff6ffff ff67ffff ff77ffff
[ 77.782375] 6fe0 ffa7ffff ffe2ffff ffebffff ffd6ffff fff6ffff ffa6ffff ff6fffff 7ff7ff7f
[ 77.783139] 7000 00200080 00000002 00000000 00000000
[ 77.783589] dwmmc_rockchip fe310000.dwmmc: Unexpected interrupt latency
[ 77.784168] 00000000
[ 77.784381] 00000000 eec27000 ffffffc0
[ 77.784622] 7020 00000000 00000001 eec27038 ffffffc0 ee8b8070 ffffffc0 ffff002f 7f7f467f
[ 77.785385] 7040 fffff7ff ffffffff ffffffff ffffffff fffff7ff 00fffeff 0c370c37 dead4ead
[ 77.786149] 7060 ffffffff ffffffff ffffffff ffffffff 000000bb fffff6ff 00000000 00000000
[ 77.786915]
X28: 0xffffffc0ed5d3780:
[ 77.787369] 3780 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.788133] 37a0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.788896] 37c0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 77.789660] 37e0 00000004 00000002 00000002 00000006 00000044 00000062 00000022 00000056
[ 77.790423] 3800 00400000 00000000 ffffffff ffffffff 00000000 00000000 00000000 00000000
[ 77.791187] 3820 defd4000 ffffffc0 00000002 00400000 00000000 00000000 00000000 00000000
[ 77.791950] 3840 00000001 00000000 00000005 00000000 ffff26d4 00000000 ed12d400 ffffffc0
[ 77.792714] 3860 00000000 00000001 00000078 00000078 00000078 00000000 08c685a0 ffffff80
[ 77.793479]
X29: 0xffffffc0defd7a30:
[ 77.793934] 7a30 dec2c000 ffffffc0 092ee738 ffffff80 e0389e00 ffffffc0 00000186 00000000
[ 77.794697] 7a50 eec27000 ffffffc0 00000000 00000000 ed5d3800 ffffffc0 defd7ab0 ffffffc0
[ 77.795461] 7a70 01060d80 ffffff80 defd7ab0 ffffffc0 01060d8c ffffff80 a00001c5 00000000
[ 77.796224] 7a90 defd7ab0 ffffffc0 01060d80 ffffff80 00000000 00000080 e44e0e10 ffffffc0
[ 77.796988] 7ab0 defd7ae0 ffffffc0 010770dc ffffff80 dec2c000 ffffffc0 e44e0d80 ffffffc0
[ 77.797751] 7ad0 e0389e00 ffffffc0 dec2c000 ffffffc0 defd7b00 ffffffc0 01077e6c ffffff80
[ 77.798515] 7af0 dd04b540 ffffffc0 dec2c000 ffffffc0 defd7b30 ffffffc0 08885a64 ffffff80
[ 77.799278] 7b10 dec2c000 ffffffc0 092ee000 ffffff80 dec2c088 ffffffc0 e0389e00 ffffffc0
[ 77.800187] —[ end trace 3bfca9be04dbddde ]—
[ 77.800596] Call trace:
[ 77.800825] Exception stack(0xffffffc0defd78e0 to 0xffffffc0defd7a10)
[ 77.801397] 78e0: ffffffc0e44e0d80 0000008000000000 ffffffc0defd7ab0 ffffff8001060d8c
[ 77.802094] 7900: ffffffbdc35eb8c0 ffffff8009205000 ffffffc0defd7970 ffffff80081c2f0c
[ 77.802792] 7920: ffffffbdc35eb8c0 ffffffc0de9a3000 0000000000000000 ffffffc0dd026330
[ 77.803488] 7940: ffffffbdc35eb8c0 ffffff8009205000 ffffffc0e1c3aa38 0000000000000015
[ 77.804185] 7960: ffffffc0defd7990 ffffff8008181964 ffffffc0defd7990 ffffff8008c56f58
[ 77.804882] 7980: 0000000000000000 00000040eed09000 00000000ffffffff 00000040eed09000
[ 77.805568] 79a0: 0000000000000000 0000000000000040 000000000000003f 0000000000000000
[ 77.806265] 79c0: ffffffc0dd04b600 0000000000000000 00000000f774c000 00000000fff474f4
[ 77.806961] 79e0: 0000000000000000 00000000fff47464 0000000000011f94 0000000000000000
[ 77.807656] 7a00: ffffff800821ac2c 0000000000000000
[ 77.808113] [] usb_function_activate+0x3c/0x88 [libcomposite]
[ 77.808793] [] uvc_function_connect+0x28/0x54 [usb_f_uvc]
[ 77.809434] [] uvc_v4l2_open+0x70/0x94 [usb_f_uvc]
[ 77.810001] [] v4l2_open+0x9c/0xe4
[ 77.810450] [] chrdev_open+0x15c/0x168
[ 77.810933] [] do_dentry_open+0x288/0x2e4
[ 77.811427] [] vfs_open+0x80/0x84
[ 77.811862] [] path_openat+0xb64/0xd34
[ 77.812341] [] do_filp_open+0x48/0x94
[ 77.812811] [] do_sys_open+0x158/0x238
[ 77.813283] [] compat_SyS_open+0x38/0x48
[ 77.813777] [] el0_svc_naked+0x24/0x28
[ 77.814469] g_webcam gadget: UVC connect failed with -22