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SubjectRe: Suspend/resume regressions on Lenovo S10-3
Hi Dave,

On 06/06/2012 06:21 PM, Deepthi Dharwar wrote:

> On 05/28/2012 07:23 AM, Dave Hansen wrote:
>
>> I have a Lenovo S10-3 Atom netbook. It's always had some amount of
>> trouble working with the intel_idle driver, so I usually compile that
>> out an use the acpi one.


What problem did you face with intel_idle driver? Is it suspend/resume
related?

I see a comment in drivers/idle/intel_idle.c such as:

/*
* Known limitations
* [...]
*
* ACPI has a .suspend hack to turn off deep c-statees during suspend
* to avoid complications with the lapic timer workaround.
* Have not seen issues with suspend, but may need same workaround here.
*
*/
So, if you are facing suspend issues with the intel_idle driver, we probably
need to add that same workaround here as well, to make it work.

Please let us know what problem you are facing.

Regards,
Srivatsa S. Bhat

>> However, just after 3.1, suspend/resume broke.
>> 'echo mem > /sys/power/state' would hang before suspending. I bisected
>> it down to the commits around:
>>
>> e978aa7d7d57d04eb5f88a7507c4fb98577def77 / v3.1-1-ge978aa7
>>
>> by Deepthi. But, current mainline (v3.4-07644-g07acfc2) hangs with a
>> different symptom: it suspends, but hangs on resume from suspend. I
>> think _that_ delta in the behavior was caused by:
>>
>> 3439a8da16bcad6b0982ece938c9f8299bb53584
>>
>> ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend
>> regression)
>>
>> It's a bit of a pain to bisect these two different things in parallel.
>> I was trying to tell git bisect 'good' on working suspend/resume, 'bad'
>> on the hang during resume, and 'skip' on the hangs _during_ suspend. 83
>> kernels in, I'm not sure that's working very well. :)
>>
>> Deepthi, do you have any idea why your patches broke me in the first
>> place? Perhaps we should fix that regression first before we go on and
>> try to figure out what changed to let it suspend again, but break later.
>
>
> Hi Dave,
>
> Sorry about my patches breaking your suspend-resume.
>
> I, basically tried out building and booting 3.1 kernel with
> my patch set to reproduce the failure. I could clearly
> see suspend not happening. It turns out to be
> a bug with my first patch in global registration
> series submitted earlier.
>
> e978aa7d7d57d04eb5f88a7507c4fb98577def77 / v3.1-1-ge978aa7
>
> The following patch, fixes the suspend issues
> seen on my laptop due to earlier cpuidle cleanup
> (Lenevo T420 booting with acpi_idle enabled).
> Can you please give this a try
> on top of my patch set (without Rafael's fix)
> and see if it fixes the problem for you.
> I am not reverting acpi_idle_suspend flag and
> hopefully it should resume fine too.
>
> ---
>
> This patch fixes suspend-resume issue seen in the kernel 3.1
> series using acpi_idle_driver because of cpuidle global
> registration cleanup.
> Here, when acpi_idle_suspend flag was set ( during suspend)
> the interrupts were not getting enabled in acpi_idle_enter_bm()
> routine which was causing the system to hang.
>
>
> Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
>
> ---
> drivers/acpi/processor_idle.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index 24fe3af..6e35293 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -895,8 +895,9 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
> if (unlikely(!pr))
> return -EINVAL;
>
> -
> if (acpi_idle_suspend) {
> + local_irq_disable();
> + local_irq_enable();
> cpu_relax();
> return -EINVAL;
> }
>
> Cheers,
> Deepthi
>



--
Regards,
Srivatsa S. Bhat
IBM Linux Technology Center



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