Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754346AbdCNBos (ORCPT ); Mon, 13 Mar 2017 21:44:48 -0400 Received: from netrider.rowland.org ([192.131.102.5]:38735 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752595AbdCNBoq (ORCPT ); Mon, 13 Mar 2017 21:44:46 -0400 Date: Mon, 13 Mar 2017 21:44:45 -0400 (EDT) From: Alan Stern X-X-Sender: stern@netrider.rowland.org To: Samuel Thibault cc: Dave Mielke , , , , , , Subject: Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk In-Reply-To: <20170313070529.mon4uxxzxsti626j@var.youpi.perso.aquilenet.fr> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1073 Lines: 26 On Mon, 13 Mar 2017, Samuel Thibault wrote: > 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 :) Indeed; I believe you. It's just odd and a little noteworthy, that's all. Alan Stern