Thor Devkit can not enumerate pad when I use a typeC-typeC cable

[ekeechg]

i,Nvidia team:
Our use case need to connect a pad to Thor. The Pad can’t be enumerate when I use a typeC-typeC cable between pad and Thor(as following pic).

But the pad can be recognized if I add a usb hub between pad and Thor,  and change to typeA-type-C cable.

I have apply this patch, and force USB work as host.

It can be reproduced in Thor Devkit.
I think the Pad don't know it should work as a device in typeC-typeC case.
How can I make it work use typeC-typeC cable? or do you have any other idear?

BR

[WayneWWW]

To clarify

1. as the hub is working, it means device tree setting to host mode is working.

2. are you sure that type C-C cable is working fine when you used with other non-Thor device? For example, a x86 host pc.

3. Have you tried other kind of device with C-C connection instead of the pad?

4. Is there any new log in dmesg when you plug the pad with Thor?

[ekeechg]

1. as the hub is working, it means device tree setting to host mode is working.
   Yes.

2. are you sure that type C-C cable is working fine when you used with other non-Thor device? For example, a x86 host pc.
   The cable works fine with my computer.

3. Have you tried other kind of device with C-C connection instead of the pad?

   I have test three kinds of devices and three kinds of cable(or connect way) connect to Devkit, all C-C cable cases are failed.
   I am sure the C-C cable works fine with my computer, I use the same cable.
   

   

4. Is there any new log in dmesg when you plug the pad with Thor?
   No.
   In addition: I add usbmon.ko to cap usb package, there is NO package captured when using C-C cable.