linux-kernel - Re: [PATCH] usb-core: Add MS_INTR

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Date:   Mon, 13 Mar 2017 08:05:29 +0100
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Dave Mielke <dave@...lke.cc>, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kevin.derome@...tech.eu, clause.andreabush@...il.com,
        mengualjeanphi@...e.fr
Subject: Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk

Alan Stern, on dim. 12 mars 2017 21:40:33 -0400, wrote:
> On Sun, 12 Mar 2017, Dave Mielke wrote:
> > [quoted lines by Alan Stern on 2017/03/12 at 21:31 -0400]
> > 
> > >A device's speed is only partially related to its USB version.  A
> > >USB-1.1 device can run at low speed or full speed.  A USB-2 device can
> > >run at low, full, or high speed.  And a USB-3 device can run at low,
> > >full, high, or Super speed.
> > 
> > Yes, I did know this, so maybe I misunderstood what you were wondering about. 
> > Were you wondering why 64ms was too long?
> 
> No, I was wondering why an HID device would run at high speed.  Both
> you and Samuel implied that this was because it was a USB-2 device.  
> But that is not an adequate answer, because it is perfectly valid for a 
> USB-2 device to run at full speed.

to_usb_device(ddev)->speed really is USB_SPEED_HIGH, otherwise the quirk
wouldn't work :)

Samuel