gmane.linux.power-management.general

Need help on Suspend on RAM

Hi all
I'm working on Suspend on RAM on kernel 2.6.23.17 on a Sh4 based platform.
The suspend on RAM seems really working.
But it I suspend the board more then 3/4 times than the system doesn't 
resume the user space
 but via JTAG I see the kernel is running.

I enabled CONFIG_DETECT_SOFTLOCKUP and the kernel prints:

|BUG: soft lockup detected on CPU#0|

Moreover I installed the patch suggested in http://lwn.net/Articles/287024/
and it seems the kernel is running in:
-   run_timer_softirq

and doing some other test I can confirm the kernel is really there...

In the board there is no real RTC... All the 'time' is based on the 
system timer
 and between suspend/resume the timer is really stopped.

Do you have some suggestion?

Regards
Ciao
 Francesco

headers

Francesco VIRLINZI | 30 Sep 11:07

Re: Need help on Suspend on RAM

Hi all
I think I find a fix (?)
In the file:
kernel/time/timekeeping.c
I'm removing the functions:
 - timekeeping_suspend and
 - timekeeping_resume
I forgot to say that I have no real ClockSource (this means that in 
suspend also the clocksource is suspended...)

Could it be a fix or there is an other solution?
Regards
 Francesco

Francesco VIRLINZI ha scritto:
> Hi all
> I'm working on Suspend on RAM on kernel 2.6.23.17 on a Sh4 based platform.
> The suspend on RAM seems really working.
> But it I suspend the board more then 3/4 times than the system doesn't 
> resume the user space
>  but via JTAG I see the kernel is running.
>
> I enabled CONFIG_DETECT_SOFTLOCKUP and the kernel prints:
>
> |BUG: soft lockup detected on CPU#0|
>
> Moreover I installed the patch suggested in http://lwn.net/Articles/287024/
> and it seems the kernel is running in:
> -   run_timer_softirq
>

(Continue reading)

headers

Pavel Machek | 8 Oct 19:01

Re: Need help on Suspend on RAM

On Tue 2008-09-30 11:07:18, Francesco VIRLINZI wrote:
> Hi all
> I think I find a fix (?)
> In the file:
> kernel/time/timekeeping.c
> I'm removing the functions:
>  - timekeeping_suspend and
>  - timekeeping_resume
> I forgot to say that I have no real ClockSource (this means that in 
> suspend also the clocksource is suspended...)

Simply commenting this out is probably not the right solution.. could
you find why it breaks your system and talk to tglx?

								Pavel

> Regards
>  Francesco
> 
> Francesco VIRLINZI ha scritto:
> > Hi all
> > I'm working on Suspend on RAM on kernel 2.6.23.17 on a Sh4 based platform.
> > The suspend on RAM seems really working.
> > But it I suspend the board more then 3/4 times than the system doesn't 
> > resume the user space
> >  but via JTAG I see the kernel is running.
> >
> > I enabled CONFIG_DETECT_SOFTLOCKUP and the kernel prints:
> >
> > |BUG: soft lockup detected on CPU#0|

(Continue reading)