On an ODROID-C1/C2 device, using the dwc2 driver, only some devices cause USB bus to enumerate devices.

Specifically, both on boot and during normal operation, if some devices are plugged in, all USB devices are detected, 
but if those devices are removed, no detection of any devices occurs.

I sadly don't have a lot more to go on, but xdarklight on IRC (I believe == Martin, CC'd) confirmed the findings with a 
grab bag of USB devices he had sitting around as well, and may be able to provide CONFIG_USB_DWC2_DEBUG output.

Any further guidance on where to look to debug this issue would be appreciated.

As a sample, some devices which, when plugged in (either alone or together) do not cause any USB device detection (see 
attached lsusb -v files):

Samsung T7 USB 3 drive
Samsung-Branded Silicon Motion USB 3 Flash Drive

Some devices which, when plugged in cause all USB devices to be detected:

Mushkin-Branded Kingston USB 3 Flash Drive
Kingston-Branded Kingston USB 2 Flash Drive
USB-3 MicroSD Card reader (lsusb/testing by xdarklight)
SanDisk USB 3 Flash Drive (lsusb/testign by xdkarlight)

Matt