...
Attached patch seems to solve problem described below (non-working USB
keyboard attached to the same port where was USB disk previously).

Please try it - maybe it solves also reported keyboard problem on
fuloong/loongson.
...

I applied the patch, on the version of the repo I had (5071), with no
luck.  Still no keyboard...

Hm, it's pity. So, there is at least one additional bug somewhere... :-(

Maybe the problem is somewhere in root port ownership change between EHCI-OHCI. Unfortunately I cannot test/debug such case, I have no PC with EHCI-OHCI combination.
I tested root port ownership change only on EHCI-UHCI PC - it works well.
Additionally I tested connection of USB keyboard to OHCI root port on PC with OHCI-only USB controller - it also works well.

Could You test if Your keyboard will work on fuloong when You use only OHCI module (don't include/load EHCI module in GRUB)? (EHCI module is not needed for USB keyboard in the case when keyboard is connected to root port - and it is Your case, according to Your lsusb output.)

BR,
Ales

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