Comment # 7 on bug 1207347 from Takashi Iwai

In the broken case, we see the message:

[    8.258316] xhci_hcd 0000:06:00.0: failed to load firmware
renesas_usb_fw.mem, fallback to ROM

which means my previous patch is working.  But by some reason, the XHCI driver
couldn't detect the device properly.

You can try to install older kernels (5.14 and later) and see whether it's
working without the firmware.  If yes, there is a regression between the
versions.  The older kernels can be found at my OBS repos, e.g. OBS
home:tiwai:kernel:5.14, home:tiwai:kernel:5.15, ...

It's possible that the device worked in the past just casually.  But it might
be worth to verify.

BTW, instead of running the command, you can simply put the firmware file as
/lib/firmware/renesas_usb_fw.mem, and rebuild initrd.  That should suffice for
the next reboot.