Cannot Bind UVC ConfigFS Configuration to UDC

[robertarndt201]

Hi Guys, hoping somebody has been successful with UVC on the RB5 before. I'm trying to get UVC going on a Qualcomm RB5 using the qcom/dunfell OE-RPB build but cannot seem to bind the ConfigFS configuration to the UDC. I'm not sure if I missed a kernel config item, or if UDC depends on a perfect ConfigFS directory structure prior to the binding, but I'm hitting a wall.

I've attached my kernel configuration, my configFS script, and my dmesg log after trying to bind. I have not tried turning the ConfigFS script into a service that runs on boot yet. The cameras I've tried are a Logitech BRIO301 and a Logitech C920.

I put some printk statements into drivers/usb/gadget/udc/core.c (different dmesg log than below) in usb_gadget_probe_driver() and it appears the udc is not in the UDC master list, because the string compare fails as udc_name has a string but udc->dev is empty. So it seems like the -19 error is because something is wrong with the UDC probe going south.

mutex_lock(&udc_lock); if (driver->udc_name) { list_for_each_entry(udc, &udc_list, list) { ret = strcmp(driver->udc_name, dev_name(&udc->dev));

                    printk("****DEBUG: Driver->udc_name: %s\n", driver->udc_name);
                    printk("****DEBUG: udc->dev name: %s\n", &udc->dev);

                    if (!ret)
                            break;
            }
            if (ret)
                    ret = -ENODEV;
            else if (udc->driver)
                    ret = -EBUSY;
            else
                    goto found;

<<

udc_name comes up as the port a600000.usb, but udc->dev comes up blank. So it seems like there's some UDC probe issue.

I can use the cameras fine to display video with a simple gstreamer pipeline, but cannot get them to present a video device on my host laptop.

-Robert (files attached through link below) uvc.txt