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Message-ID: <1421083783.22660.69.camel@x220>
Subject: Re: [PATCH 3/3] usb: dwc3: add a quirk for device disconnection
 issue in Synopsis dwc3 core
From: Paul Bolle <pebolle@tiscali.nl>
To: balbi@ti.com, Pawel Moll <pawel.moll@arm.com>
Cc: Sneeker Yeh <sneeker.yeh@gmail.com>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
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        Hans de Goede <hdegoede@redhat.com>,
        Thomas Pugliese <thomas.pugliese@gmail.com>,
        David Mosberger <davidm@egauge.net>,
        Peter Griffin <peter.griffin@linaro.org>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Andrew Bresticker <abrestic@chromium.org>,
        Gregory CLEMENT <gregory.clement@free-electrons.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-omap@vger.kernel.org,
        Andy Green <andy.green@linaro.org>,
        Jassi Brar <jaswinder.singh@linaro.org>,
        Sneeker Yeh <Sneeker.Yeh@tw.fujitsu.com>
Date: Mon, 12 Jan 2015 18:29:43 +0100
In-Reply-To: <20150112172032.GD6525@saruman>
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	 <20150105170921.GH19336@saruman>
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On Mon, 2015-01-12 at 11:20 -0600, Felipe Balbi wrote:
> On Sun, Jan 11, 2015 at 11:19:55PM +0800, Sneeker Yeh wrote:
> > in case i express unclearly i also put a pdf:
> > https://drive.google.com/file/d/0B18MmcvvKjNNbDF6eEdHSzZCazA/view
> > 
> > This issue is defined by a two-way race at disconnect, between
> > 1) class driver interrupt endpoint resheduling attempts if the ISR gave an
> > ep error event due to device detach (it would try 3 times)
> > 2) Disconnect interrupt on PORTSC_CSC, which is cleared by hub thread
> > asynchronously
> > 3) The hardware IP was configured in silicon with
> >        - DWC_USB3_SUSPEND_ON_DISCONNECT_EN=1 (this is an IP configuration
> 
> yeah, aparently this is another configuration which is not exposed on
> HWPARAMS registers. Paul, can you confirm for us ? I couldn't find it on
> Databook on any of the HWPARAMS registers.

I guess you meant to ask Pawel, because I know nothing at all about all
that! 

Thanks,


Paul Bolle