Issue in Video Streaming with gadget webcam module g_webcam in i.MX8m processor

[nikhil3karale]

Hi,

I am working on streaming video from my custom camera chip interfaced with i.MX8M board (linux kernel 4.14.78) using uvc interface over host pc.

I have configured the i.MX8m as webcam gadget and it is getting detected as a usb webcam at host pc.

But when i am trying to stream the video from host application (with uvc app running over i.MX8M target board), it fails with error:-  dwc3 38100000.dwc3: request ffff80007752c600 was not queued to ep2in and stops video streaming.

Please find attached log file for reference.

[nikhil3karale]

Can anyone help me on above issue...?

[joanxie]

could you use gstreamer to test?

Using a USB Camera with GStreamer 

I also send you two links for reference:

g_webcam gadget needs patch - ODROID 

How use USB as both gadget mode and host mode usb USB_OTG? 

[nikhil3karale]

Hi Joan Xie,

Thanks for the reply.

I want the i.MX8M board (along with camera chip interfaced with board using MIPI-CSI) to be used in usb device mode and not as a usb host.  In my case i.MX8M board is also getting detected as a usb camera device on my host pc but not able to stream video data over host pc.

Also as per link g_webcam gadget needs patch - ODROID , patch is for kernel 3.6 while i am using kernel 4.14 and also not able to open the link provided for the patch.

[joanxie]

you need to enable g_webcam driver in the kernel, and require user space application to finish this, maybe you can refer to the lib for imx6 as reference:

USB Video Class Gadget Library | UVC Driver Linux | UVC Linux