linux-kernel - Re: [PATCH 6/6][RFC] PM / Domains: Support for multiple generic power domain states

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Date:	Mon, 16 May 2011 12:07:39 +0200
From:	Kevin Hilman <khilman@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>, LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org,
	MyungJoo Ham <myungjoo.ham@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 6/6][RFC] PM / Domains: Support for multiple generic power domain states

Hi Rafael,

"Rafael J. Wysocki" <rjw@...k.pl> writes:

> From: Rafael J. Wysocki <rjw@...k.pl>
>
> Allow the generic power domains support code to handle power
> domains with multiple states.  

Thanks!

Before I even had the time to respond to you about my previous request
for this kind of feature, you've already implmented it. :)  

> Replace the .power_down_ok()
> callback in struct dev_power_governor with a new callback
> .choose_state() that will return the number of the state to put the
> power domain into.  Add new fields nr_states and current_state to
> struct generic_power_domain with the assumption that state 0 will be
> the full power state and states 1 through (nr_states - 1) will be low
> power.  
> Replace power domain callbacks .power_off() and .power_on()
> with a single .set_state() callback taking the number of the state
> to put the power domain into as its second argument.  Add a new
> generic power domain callback .power_off_state() (taking a state
> number as its second argument) allowing the core to check if
> device runtime PM callbacks need to be executed before putting the
> given power domain into the given state.  Modify the core power
> domains code and the ARM shmobile platform code to take all of the
> above changes into account.
>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Reviewed-by: Kevin Hilman <khilman@...com>

This looks like a better starting point for more complicated hardware.

Thanks,

Kevin
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