Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751141AbdCMHHG (ORCPT ); Mon, 13 Mar 2017 03:07:06 -0400 Received: from hera.aquilenet.fr ([141.255.128.1]:39361 "EHLO hera.aquilenet.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750763AbdCMHHB (ORCPT ); Mon, 13 Mar 2017 03:07:01 -0400 Date: Mon, 13 Mar 2017 08:05:29 +0100 From: Samuel Thibault To: Alan Stern Cc: Dave Mielke , gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, kevin.derome@epitech.eu, clause.andreabush@gmail.com, mengualjeanphi@free.fr Subject: Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk Message-ID: <20170313070529.mon4uxxzxsti626j@var.youpi.perso.aquilenet.fr> Mail-Followup-To: Samuel Thibault , Alan Stern , Dave Mielke , gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, kevin.derome@epitech.eu, clause.andreabush@gmail.com, mengualjeanphi@free.fr References: <20170313013649.GH20039@beta.private.mielke.cc> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: I am not organized User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 910 Lines: 21 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