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

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Message-Id: <201105162029.18615.rjw@sisk.pl>
Date:	Mon, 16 May 2011 20:29:18 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Kevin Hilman <khilman@...com>
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

On Monday, May 16, 2011, Kevin Hilman wrote:
> 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!

No problem. :-)

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

Well, I had the idea how to implement it right after I had replied to
your previous message.  The only problem was to find the time to actually
prepare a patch.

> > 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>

Thanks!

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

I agree.

Rafael
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