linux-kernel - Re: [PATCH 3/3] usb: dwc3: add a quirk for device disconnection issue in Synopsis dwc3 core

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Date:	Mon, 12 Jan 2015 18:29:43 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	balbi@...com, Pawel Moll <pawel.moll@....com>
Cc:	Sneeker Yeh <sneeker.yeh@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>,
	Hans de Goede <hdegoede@...hat.com>,
	Thomas Pugliese <thomas.pugliese@...il.com>,
	David Mosberger <davidm@...uge.net>,
	Peter Griffin <peter.griffin@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	Andy Green <andy.green@...aro.org>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Sneeker Yeh <Sneeker.Yeh@...fujitsu.com>
Subject: Re: [PATCH 3/3] usb: dwc3: add a quirk for device disconnection
 issue in Synopsis dwc3 core

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

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