From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755470AbaCDTEJ (ORCPT ); Tue, 4 Mar 2014 14:04:09 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:39861 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752482AbaCDTEH (ORCPT ); Tue, 4 Mar 2014 14:04:07 -0500 Date: Tue, 4 Mar 2014 11:05:50 -0800 From: Greg Kroah-Hartman To: Julius Werner Cc: Oliver Neukum , Luigi Semenzato , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: Re: [PATCH 2/2] usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests Message-ID: <20140304190550.GB4695@kroah.com> References: <1393959186-331-1-git-send-email-jwerner@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1393959186-331-1-git-send-email-jwerner@chromium.org> User-Agent: Mutt/1.5.22 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 04, 2014 at 10:53:06AM -0800, Julius Werner wrote: > The DELAY_INIT quirk only reduces the frequency of enumeration failures > with the Logitech HD Pro C920 and C930e webcams, but does not quite > eliminate them. We have found that adding a delay of 100ms between the > first and second Get Configuration request makes the device enumerate > perfectly reliable even after several weeks of extensive testing. The > reasons for that are anyone's guess, but since the DELAY_INIT quirk > already delays enumeration by a whole second, wating for another 10th of > that isn't really a big deal for the one other device that uses it, and > it will resolve the problems with these webcams. > > Change-Id: Ibf738426307fe8ef362768db2decc9bc2b30a930 What am I supposed to do with this line? :)