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

Pavel Machek
2016-05-01T08:52:41Z

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,