Yes, AFAIK PCI_DEVICE_ID_INTEL_GLK_XHCI is actually 0x31a8, and I do have it: 00:15.0 USB controller [0c03]: Intel Corporation Device [8086:31a8] (rev 03) Board is M1K. My kernel is 5.4.0-48-lowlatency with the following additional patch: https://lore.kernel.org/patchwork/patch/1037542/ I have dwc3 as a kernel module. I'm not testing any gadget, I just have no idea what to test. Could you please suggest some sources on how I should map gadget onto my dwc3 port? Thanks & Kind Regards, - Dmitry. пн, 19 окт. 2020 г. в 15:36, Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>: > > On Mon, Oct 19, 2020 at 01:27:35PM +0200, Dmitry N. Mikushin wrote: > > Dear All, > > > > I'm confused by the USB gadget mode on the recent Intel SoCs, such as > > Gemini Lake. The /sys/class/udc is empty, and a SoC can't present > > itself as a IoT gadget this way, yet definitely being designed as > > such. I've noticed the concept of dual-role-device, which seems to > > replace the OTG. Particularly, Harry Pan mentioned that Gemini Lake > > supports DRD in port 0. > > So do you have the dwc3 (the USB device controller) PCI device > available/visible on your system? What do you get if you run: > > lspci -nn|grep USB > > The DWC3 PCI device ID on Gemini lake is 0x31aa (search > PCI_DEVICE_ID_INTEL_GLK in drivers/usb/dwc3/dwc3-pci.c). > > Which board/product are you using. > Which kernel are you using? > Is the dwc3 driver enabled in your kernel? > Which gadget are you testing with? g_zero? > > thanks, > > -- > heikki
