[PATCHv4 4/8] ARM: OMAP3: add manual control for mpu / core pwrdm usecounting

[t-kristo@ti.com (Tero Kristo)]

On Mon, 2012-08-06 at 12:14 +0200, Jean Pihet wrote:
> Hi Tero,
> 
> On Mon, Jul 30, 2012 at 10:40 AM, Tero Kristo <t-kristo@ti.com> wrote:
> > On Fri, 2012-07-27 at 12:36 -0700, Kevin Hilman wrote:
> >> Tero Kristo <t-kristo@ti.com> writes:
> >>
> >> > mpu / core powerdomain usecounts are now statically increased
> >> > by 1 during MPU activity. This allows the domains to reflect
> >> > actual usage, and will allow the usecount to reach 0 just before
> >> > all CPUs are ready to idle. Proper powerdomain usecounts are
> >> > propageted to voltagedomain level also, and will allow vc
> >> > callbacks to be triggered at right point of time.
> >> >
> >> > Signed-off-by: Tero Kristo <t-kristo@ti.com>
> >> > Cc: Paul Walmsley <paul@pwsan.com>
> >> > Cc: Kevin Hilman <khilman@ti.com>
> >>
> >> IMO, the idea is fine, but I'm not crazy about the implementation in
> >> powerdomain.c, which is meant for pwrdm generic code.   In particular,
> >> I'm not crazy about the pwrdm lookups in powerdomain.c.
> >>
> >> Since pm<soc>.c already has references to mpu_pwrdm and core_pwrdm, why
> >> not just add the pwrdm_clkdm_enable/disable calls directly in pm<soc>.c
> >
> > I think this was how the patch was in some earlier rev but I thought I'd
> > try to be more clever with this. :) I can revert the implementation back
> > to this.
> Furthermore after the changes in pre/post transitions [1], some more
> checks will be needed to identify the transitions on the mpu and core
> power domains.
> 
> [1] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=e055548953355b6e69c56f9e54388845b29b4e97
> 
> Regards,
> Jean

Hi Kevin,

What is the latest status regarding this one, seeing the patch mentioned
got reverted due to problems? Should I do some changes for this or not?

I can look at moving the code away from the generic powerdomain.c at
least, but is there anything else?

-Tero 

> 
> >
> >> Also, the changelog should be a bit more specific about why CORE
> >> powerdomain is also handled here when most of the code only talks about
> >> the CPU.
> >
> > Yea, I'll add some beef to this also.
> >
> > -Tero
> >
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