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Re: Nokia N900 retention mode in v4.6, camera buttons fun

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  Re: Nokia N900 retention mode in v4.6, camera buttons fun Sebastian Reichel <sre@kernel.org> - 2016-04-29 22:10 +0200
    Re: Nokia N900 retention mode in v4.6, camera buttons fun Pavel Machek <pavel@ucw.cz> - 2016-05-01 11:00 +0200
      Re: Nokia N900 retention mode in v4.6, camera buttons fun Sebastian Reichel <sre@kernel.org> - 2016-05-01 17:50 +0200
        Re: Nokia N900 retention mode in v4.6, camera buttons fun Sebastian Reichel <sre@kernel.org> - 2016-05-02 22:20 +0200

#1391380 — Re: Nokia N900 retention mode in v4.6, camera buttons fun

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Hi,

On Thu, Apr 21, 2016 at 03:04:50PM +0200, Pali Rohár wrote:
> > CONFIG_HSI breaks power management completely, so power management
> > with modem will be another topic.  
> 
> Sebastian, any idea why power management does not work for HSI?

I wasn't aware, that pm_runtime_irq_safe() basically breaks runtime
PM until Tony's fix for musb (even though it's logical when thinking
about it). Currently omap-ssi and omap-ssi-port make use of
pm_runtime_irq_safe().

Since pm_runtime_get_sync/pm_runtime_put_sync is called from
tasklets in omap-ssi (and omap-ssi-port) it cannot be simply
removed. So fixing PM for the ssi controller requires reworking
the driver in a non trivial way.

-- Sebastian

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#1391775

On Fri 2016-04-29 22:06:00, Sebastian Reichel wrote:
> Hi,
> 
> On Thu, Apr 21, 2016 at 03:04:50PM +0200, Pali Rohár wrote:
> > > CONFIG_HSI breaks power management completely, so power management
> > > with modem will be another topic.  
> > 
> > Sebastian, any idea why power management does not work for HSI?
> 
> I wasn't aware, that pm_runtime_irq_safe() basically breaks runtime
> PM until Tony's fix for musb (even though it's logical when thinking
> about it). Currently omap-ssi and omap-ssi-port make use of
> pm_runtime_irq_safe().
> 
> Since pm_runtime_get_sync/pm_runtime_put_sync is called from
> tasklets in omap-ssi (and omap-ssi-port) it cannot be simply
> removed. So fixing PM for the ssi controller requires reworking
> the driver in a non trivial way.

I see latest series, and it also talks about frequency scaling. But I
guess it is not going to fix this issue?

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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#1391833

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Hi,

On Sun, May 01, 2016 at 10:52:36AM +0200, Pavel Machek wrote:
> On Fri 2016-04-29 22:06:00, Sebastian Reichel wrote:
> > On Thu, Apr 21, 2016 at 03:04:50PM +0200, Pali Rohár wrote:
> > > > CONFIG_HSI breaks power management completely, so power management
> > > > with modem will be another topic.  
> > > 
> > > Sebastian, any idea why power management does not work for HSI?
> > 
> > I wasn't aware, that pm_runtime_irq_safe() basically breaks runtime
> > PM until Tony's fix for musb (even though it's logical when thinking
> > about it). Currently omap-ssi and omap-ssi-port make use of
> > pm_runtime_irq_safe().
> > 
> > Since pm_runtime_get_sync/pm_runtime_put_sync is called from
> > tasklets in omap-ssi (and omap-ssi-port) it cannot be simply
> > removed. So fixing PM for the ssi controller requires reworking
> > the driver in a non trivial way.
> 
> I see latest series, and it also talks about frequency scaling. But I
> guess it is not going to fix this issue?

No, this is independent of the runtime PM problems. I also worked
on runtime PM/idling yesterday and pm_runtime_irq_safe is the main
culprit for breaking it (not the only one, though). It's not yet
finished though

-- Sebastian

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#1392496

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Hi Pavel,

On Sun, May 01, 2016 at 05:48:56PM +0200, Sebastian Reichel wrote:
> > I see latest series, and it also talks about frequency scaling.
> > But I guess it is not going to fix this issue?
> 
> No, this is independent of the runtime PM problems. I also worked
> on runtime PM/idling yesterday and pm_runtime_irq_safe is the main
> culprit for breaking it (not the only one, though). It's not yet
> finished though

I will be on vacation for a week starting tomorrow. If you want to
play around with my intermediate SSI PM status, you can try this branch:

https://git.kernel.org/cgit/linux/kernel/git/sre/linux-hsi.git/log/?h=runtime-pm-fixes

-- Sebastian

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