On Thu, 21 Apr 2016, Peter Chen wrote:

> I have one more question, if hcd codes takes primary hcd as USB2 and
> shared hcd as USB3, are there any problems if EHCI (or OHCI) as primary
> hcd and OHCI (EHCI) as shared hcd like [1], current hcd code seems to
> use hcd->shared_hcd at drivers/usb/core/port.c
> 
> [1] http://www.spinics.net/lists/linux-usb/msg139344.html

Neither EHCI nor OHCI can ever be a shared_hcd; only xHCI has a 
shared_hcd.  EHCI and OHCI can be companions, not shared.

Alan Stern

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