linux-kernel - Re: [PATCH 2/2] usb: Make DELAY_INIT quirk wait 100ms between Get Configuration requests

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Message-ID: <20140304190550.GB4695@kroah.com>
Date:	Tue, 4 Mar 2014 11:05:50 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Julius Werner <jwerner@...omium.org>
Cc:	Oliver Neukum <oneukum@...e.de>,
	Luigi Semenzato <semenzato@...omium.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: Make DELAY_INIT quirk wait 100ms between Get
 Configuration requests

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?  :)

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