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Message-ID: <20160429200559.GA16598@earth>
Date:	Fri, 29 Apr 2016 22:06:00 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Pavel Machek <pavel@....cz>, Tony Lindgren <tony@...mide.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
	patrikbachan@...il.com, serge@...lyn.com,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: Nokia N900 retention mode in v4.6, camera buttons fun

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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