Todd, On Tue, Aug 2, 2011 at 10:57 AM, Jean Pihet <jean.pihet@xxxxxxxxxxxxxx> wrote: > Todd, > > On Fri, Jul 29, 2011 at 10:50 AM, Jean Pihet <jean.pihet@xxxxxxxxxxxxxx> wrote: >> On Fri, Jul 29, 2011 at 10:08 AM, Todd Poynor <toddpoynor@xxxxxxxxxx> wrote: >>> On Thu, Jul 28, 2011 at 10:30:14AM +0200, jean.pihet@xxxxxxxxxxxxxx wrote: > ... > >>>> diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c >>>> index 9af0847..63c3e7a 100644 >>>> --- a/arch/arm/mach-omap2/powerdomain.c >>>> +++ b/arch/arm/mach-omap2/powerdomain.c >>>> @@ -108,6 +108,9 @@ static int _pwrdm_register(struct powerdomain *pwrdm) >>>> pwrdm->state = pwrdm_read_pwrst(pwrdm); >>>> pwrdm->state_counter[pwrdm->state] = 1; >>>> >>>> + /* Early init of the next power state */ >>>> + pwrdm_set_next_pwrst(pwrdm, PWRDM_POWER_RET); >>>> + >>> >>> Wanted to check that it's OK to initialize the next state of a power >>> domain to RETENTION early in the boot sequence. I believe patches >>> have been previously discussed that set the state to ON to ensure the >>> domain doesn't go to a lower state, and possibly lose context, before >>> the PM subsystem is setup to handle it? Not sure, thought maybe worth >>> a doublecheck. >> Indeed I need to check the behavior for OMAP3 & 4 which seem to >> initialize the pwrdm states differently. >> BTW the patch that inits all pwrdms to ON is not yet in l-o master >> that is why I (lazily) submitted this one for now. > > Ok I will update the patch to make it compliant with [1]. v4 will > include this change. > > Thanks, > Jean > > [1] http://marc.info/?l=linux-arm-kernel&m=131052762623823&w=2 After more thinking I now realize there is a problem with the PM early init, PM late init and the constraints framework which all setup the power domains next states in a non-coherent way. Definitely this needs to be revisited. More to come on this! There is a comment about that in [00/15] of the v4 patch set. Regards, Jean > >> >>> >>> >>> Todd > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
