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

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Date:   Sun, 12 Mar 2017 21:40:33 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Dave Mielke <dave@...lke.cc>
cc:     Samuel Thibault <samuel.thibault@...-lyon.org>,
        <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

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.

Alan Stern