[PATCH v3 1/4] ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use

[Nishanth Menon]

On 17:04-20130405, Felipe Balbi wrote:
> Hi,
> 
> On Fri, Apr 05, 2013 at 08:35:11AM -0500, Nishanth Menon wrote:
> > On 16:19-20130405, Felipe Balbi wrote:
> > > On Fri, Apr 05, 2013 at 06:29:00PM +0530, Santosh Shilimkar wrote:
> > > > OMAP5 and future OMAP based SOCs has backward compatible MPUSS
> > > > IP block with OMAP4. It's programming model is mostly similar.
> > > 
> > > s/It's/Its/
> > > s/mostly //
> > > 
> > > (similar already expands to 'almost the same' :-)
> > > 
> > > > @@ -355,6 +389,12 @@ int __init omap4_mpuss_init(void)
> > > >  
> > > >  	save_l2x0_context();
> > > >  
> > > > +	if (cpu_is_omap44xx()) {
> > > > +		omap_pm_ops.finish_suspend = omap4_finish_suspend;
> > > > +		omap_pm_ops.resume = omap4_cpu_resume;
> > > > +		omap_pm_ops.scu_prepare = scu_pwrst_prepare;
> > > > +	}
> > > 
> > > why don't you just rename omap4_* into omap_* and add cpu-based checks
> > > there in order to handle differences between omap4 and omap5?
> > > 
> > > If implementation will be almost the same for both, you might be able to
> > > save on some more duplication, no ?
> > Jeez NO! finish_suspend is assembly, further, it is the hottest path in
> > cpuidle framework - for every WFI we invoke it. we definitely dont want
> > to add more overhead beyond what is necessary.
> 
> alright, settle down ;-) whoever suggested that isn't here anymore
hehe, Apologies, I was'nt that stressed as the wording might have
indicated.. We spend tons of time evaluating with Lauterbach tracing to
weed out hot paths - folks who have been bitten by these tend to feel a
little defensive I guess and to have surprise regressions are painful to
find and fix - esp when around not-so-obvious paths ;)

-- 
Regards,
Nishanth Menon