Re: FW: Alchemy power managment code.

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

Hello.

Ralf Baechle wrote:

> > >    The TOY cpunter 0 clockevent driver is also need to be written for
> > > the recent kernel as CP0 timer stops ticking after wait insn is executed 
> > > -- see arch/mips/au1000/common/time.c...
> >   And here's found another possible issue with Alchemy PM -- the CP0 
> > counter counts at unpredictable frequency in idle state (after executing 
> > "wait"), so the MIPS clocksource will probably be unstable?
> Correct - and cevt-r4k won't be usable either.  I guess that means you
> leave the user the choice between either these two or using wait.  Not
> nice but ...
   The Alchemy code doesn't even try to use CP0 counter when CONFIG_PM=y if 
you look into arch/mips/au1000/common/time.c... or at least it didn't before 
Atsushi removed do_fast_pm_gettimeoffset().
>   Ralf
WBR, Sergei