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

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Message-ID: <Pine.LNX.4.44L0.1703122128280.30930-100000@netrider.rowland.org>
Date:   Sun, 12 Mar 2017 21:31:03 -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 17:18 -0400]
> 
> >Interesting.  This is a high-speed device that mistakenly uses the 
> >low/full-speed encoding for an interrupt bInterval value?
> 
> Yes.
> 
> >That's pretty unusual.  Most HID devices (which includes the Braille
> >devices I have heard of) run at low speed, and a few of them run at 
> >full speed.  I can't remember any running at high speed.
> 
> According to my collection of data, 5 say 1.00, 15 say 1.1, and 21 say 2.0.

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.

Alan Stern