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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