Does this mean all TB3 support will be removed? Is there more to cleanup in that case?

Does this mean all TB3 support will be removed?

as I understood it, USB4 pretty much just standardized existing TB3 controllers, so I guess it would be possible to have a TB3 controller for which a USB4 driver/HCM would work. Not that I know of any such controllers. This is the existing check to set HCM usage, which would maybe imply there are some devices which normally use an ICM but for which a HCM would work:

	if (NHI_IS_USB4(sc) || (sc->force_hcm == NHI_FORCE_HCM_ON))
		sc->caps |= NHI_CAP_HCM;

maybe @scottl could elucidate this

Is there more to cleanup in that case?

yeah, we should anyway also remove all this force_hcm stuff seeing as that's all we're going to support.