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

From	Sebastian Reichel <sre@kernel.org>
Newsgroups	linux.kernel
Subject	Re: Nokia N900 retention mode in v4.6, camera buttons fun
Date	2016-04-29 22:10 +0200
Message-ID	<rtmTE-3yl-27@gated-at.bofh.it> (permalink)
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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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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

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