Hi Krzyszof, On Mon, Jan 11, 2016 at 7:51 AM, Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> wrote: > On 11.01.2016 10:48, Sriram V wrote: >> Hi Krzystof, >> >> >> >> On Mon, Jan 11, 2016 at 4:57 AM, Krzysztof Kozlowski >> <k.kozlowski@xxxxxxxxxxx> wrote: >>> 2016-01-10 22:49 GMT+09:00 Sriram V <vshrirama@xxxxxxxxx>: >>>> Hi Krzysztof, >>>> >>>> I see that in pm_genpd_sumarry, the domains are off. However, i still >>>> see the clocks are on. >>>> For example; isp and cam is turned off in pm_genpd_summary, however >>>> cam clocks are still on. >>>> >>>> Should'nt the clocks be turned off first and then the domain. >>> >>> No, the clocks in clock hierarchy are usually not disabled as a part >>> of domain power off. However respective drivers attached to a power >>> domain, when entering runtime suspend, should disable these clocks. >>> >> >> That is true, runtime suspend framework should disable the clocks. >> Hence, my question is if the clocks are active, Will disabling the >> domain take effect? Because when i print the status - they show that >> the domain is OFF. > > Yes, the domain will be disabled. > >> >> On my system, what i see is camera clocks are active, But the domain >> is OFF. Hence, i am not sure if camera subsystem is consuming power or >> not since clocks are on. >> >>>From my understanding, the domain status should not indicate OFF if >> any clocks are still on. > > Clocks and power domains in Linux are (mostly) independent subsystems so > the domain will be disabled even though some clocks are active. Some > clocks may be even missing in Linux (not defined) - it doesn't matter... > > It doesn't matter except in all the cases when this is a bug. :) The > clocks should be disabled and some muxes reparented to oscclk. One of > the cases we had was hang on reading clk_summary when power domain is off. > Thanks for your pointers. When i boot the kernel, I see that the following domains are currently on. I see that the following domains are currently on, Linux does not know about these domains and they are permanently on. pd-fsys, pd-psgen, pd-peric, pd-wcore Is there a way of finding out if these can be shut off. i dont think if clocks for the IP's serviced by these domains and the domain itself is correctly tied-in in runtime-pm. As these domains are always on. Also, what kernel are you using? Is there a way of finding out if these can be shut off. i dont think if clocks for the IP's serviced by these domains and the domain itself is correctly tied-in in runtime-pm. Also, what kernel are you using? > Best regards, > Krzysztof > -- Regards, Sriram -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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