[PATCH 1/6] omap4: powerdomain: Add supported INACTIVE power state

Paul Walmsley paul at pwsan.com
Mon Jan 31 18:14:12 EST 2011

Hello Santosh,

On Fri, 28 Jan 2011, Santosh Shilimkar wrote:

> On OMAP4, one can explicitly program INACTIVE as the power state of
> the logic area inside the power domain. Techincally PD state programmed
> to ON and if all the clock domains within the PD are idled, is equivalent
> tp PD programmed to INACTIVE and all the clock domains within the PD are
> idled. There won't be any power difference in above two.
> Since the CPUIDLE C-states explicitly make use of INACTIVE as a PD
> targeted state and also there is some additional latancy involved
> with PD INACTIVE vs PD ON, it's better to support it as an explcit
> PD state.
> This patch adds the support to allow explicit PD INACTIVE
> programming if supported.

What does the hardware do when the powerdomain is programmed to INACTIVE?  
Does it actually force the clockdomains idle?

- Paul

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