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Date: Tue, 2 Aug 2016 09:08:13 +0800
From: Peter Chen <hzpeterchen@gmail.com>
To: Joshua Clayton <stillcompiling@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>, Peter Chen <peter.chen@nxp.com>,
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Subject: Re: [PATCH v3 0/6] power: add power sequence library
Message-ID: <20160802010812.GA26831@shlinux2>
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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@gmail.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