From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Subject: Re: [RFC PATCH] usb/acpi: Add support usb port power off mechanism
 for device fixed on the motherboard
Date: Mon, 14 May 2012 18:47:26 -0700
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To: Greg KH <gregkh@linuxfoundation.org>, Alan Stern <stern@rowland.harvard.edu>, Lan Tianyu <tianyu.lan@intel.com>, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-usb@vger.kernel.org

On Fri, May 11, 2012 at 11:09:40PM +0200, Peter Stuge wrote:
> Sarah Sharp wrote:
> > Theoretically there's no maximum number for xHCI root ports
> 
> Hm? Please clarify this?
> 
> HCSPARAMS1 MaxPorts is 8 bits and "Valid values are in the range of
> 1h to FFh."

Sorry, yes, you're correct, the maximum number of ports for xHCI is 255.
I was just trying to point out that it's possible that xHCI hosts will
have a much larger number of USB ports than what we've previously seen
on EHCI host controllers.

Sarah Sharp