20:01 <disctanger> Hi everyone. I have a device called PineCube that is powered by S3 SoC(https://linux-sunxi.org/S3) that i am trying to get USB UVC Gadget working on USB OTG port.

20:01 <disctanger> Unfortunatelly, i could not get UVC working on the device. USB Gadget wiki page (https://linux-sunxi.org/USB_Gadget) also missing UVC section in it.

20:01 <disctanger> I have tried g_webcam and configfs methods. I am getting almost the same error in both options:

20:01 <disctanger> g_webcam error: ``` [ 1741.996382] g_webcam gadget: uvc: uvc_function_bind() [ 1741.996423] g_webcam gadget: uvc: Unable to allocate streaming EP [ 1741.996468] udc musb-hdrc.2.auto: failed to start g_webcam: -22 ```

20:01 <disctanger> configfs error: ``` [ 2035.636565] configfs-gadget gadget: uvc: uvc_function_bind() [ 2035.636608] configfs-gadget gadget: uvc: Unable to allocate streaming EP [ 2035.636647] udc musb-hdrc.2.auto: failed to start g1: -22 ```

20:02 <disctanger> My question: Is there any way to get UVC working on this device? Maybe something like recompiling kernel with additional options etc...

20:02 <disctanger> By the way, i have tried USB Ethernet on OTG port and it is working fine without issues. I can connect to PineCube from host device after setting up the network.

20:03 <disctanger> OS info: OS: Armbian focal (22.02.0-trunk.0003) armv7l

20:03 <disctanger> Host: PineCube IP Camera Kernel: 5.15.35-sunxi

20:03 <disctanger> CPU: Allwinner sun8i Family (1)

20:03 <disctanger> lsmod output after configfs method: usb_f_uvc, videobuf2_vmalloc, videobuf2_dma_sg, libcomposite, 8189es, cfg80211, sun6i_csi, axp20x_adc, videobuf2_dma_contig, industrialio, ov5640, videobuf2_memops, v4l2_fwnode, videobuf2_v4l2, videobuf2_common, v4l2_async, evdev, rfkill, zram, uio_pdrv_genirq, uio, sch_fq_codel, ip_tables, x_tables, autofs4, pinctrl_axp209, pwrseq_simple, sun4i_lradc_keys, sunxi, phy_generic

20:07 <disctanger> Os is newly installed. There're no additional modules or software installed on it(v4l2 is preinstalled). I try each gadget method (g_webcam, configfs, g_ether) after fresh reboot.

21:24 <apritzel> disctanger: you could try to start digging at the error report, in drivers/usb/gadget/function/f_uvc.c, for instance figuring out why usb_ep_autoconfig() failed, exactly