linux-kernel - Re: [PATCH v3 0/6] power: add power sequence library

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Date:	Tue, 2 Aug 2016 09:08:13 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Joshua Clayton <stillcompiling@...il.com>
Cc:	Fabio Estevam <festevam@...il.com>,
	Peter Chen <peter.chen@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Sebastian Reichel <sre@...nel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Krzysztof Kozłowski <k.kozlowski@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	USB list <linux-usb@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
	Troy Kisky <troy.kisky@...ndarydevices.com>,
	Oscar Curero <oscar@...andei.net>, stephen.boyd@...aro.org,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH v3 0/6] power: add power sequence library

On Mon, Aug 01, 2016 at 07:55:10AM -0700, Joshua Clayton wrote:
> 
> 
> On 07/28/2016 09:41 AM, Fabio Estevam wrote:
> > Hi Joshua,
> >
> > On Thu, Jul 28, 2016 at 12:56 PM, Joshua Clayton
> > <stillcompiling@...il.com> wrote:
> >
> >> I assume there is a v4 coming due to rmk's comments on patch 5.
> >> I couldn't figure out where to null the of_node in error paths, but in testing
> >> we did put a line of code to null the of_node on release.
> >>
> >> but...
> >> As an aside,
> >> I was hoping this series would magically fix a problem
> >> with the imx6q-evi which has forced us to disable
> >> runtime power management. But it did not. :(
> > I also see a similar problem on a mx28 board with a hub.
> >
> > Does it help in your case if you pass 'usbcore.autosuspend=-1' in the
> > kernel command line?
> >
> > Regards,
> >
> > Fabio Estevam
> Thanks a million, Fabio!
> 
> 'usbcore.autosuspend=-1' quiets the errors.
> 
> ~joshua
> 

If you are using imx6q, there are some patches which is not upstreamed
to workaround one SoC problem.

http://www.spinics.net/lists/linux-usb/msg98682.html

Try to implement the design for notify_suspend/resume at
drivers/usb/phy/phy-mxs-usb.c and drivers/usb/chipidea/host.c

You can refer to the code at:
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/?h=imx_4.1.15_1.0.0_ga

-- 

Best Regards,
Peter Chen