linux-kernel - Re: [PATCH] PM / Domains: Call driver's noirq callbacks

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Date:   Tue, 20 Jun 2017 16:04:03 +0300
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / Domains: Call driver's noirq callbacks

On 20.06.2017 15:47, Ulf Hansson wrote:
> On 20 June 2017 at 14:05, Mikko Perttunen <mperttunen@...dia.com> wrote:
>> Currently genpd installs its own suspend_noirq and resume_noirq
>> callbacks, but never calls down to the driver's corresponding
>> callbacks. Add these calls.
>>
>> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
>> ---
>>
>>  drivers/base/power/domain.c | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
>> index d3f1d96f75e9..c3b6e6018c02 100644
>> --- a/drivers/base/power/domain.c
>> +++ b/drivers/base/power/domain.c
>> @@ -925,6 +925,10 @@ static int pm_genpd_suspend_noirq(struct device *dev)
>>                         return ret;
>>         }
>>
>> +       ret = pm_generic_suspend_noirq(dev);
>> +       if (ret)
>> +               return ret;
>
> Two things:
> 1) I would move this a couple of lines further above, as to avoid
> pm_runtime_force_suspend() from being called before, as it may suspend
> the device before the noirq callbacks gets to run.

Sure.

> 2) pm_genpd_suspend_noirq() is also assigned to the ->poweroff_noirq()
> callback. Certainly we don't want run the *suspend* variants of the
> callback, but rather the *poweroff* variants in that case.

Ah, didn't notice this. Will fix.

Thanks for the comments, I'll post a v2.
Mikko

>
>> +
>>         genpd_lock(genpd);
>>         genpd->suspended_count++;
>>         genpd_sync_power_off(genpd, true, 0);
>> @@ -958,6 +962,10 @@ static int pm_genpd_resume_noirq(struct device *dev)
>>         genpd->suspended_count--;
>>         genpd_unlock(genpd);
>>
>> +       ret = pm_generic_resume_noirq(dev);
>> +       if (ret)
>> +               return ret;
>> +
>>         if (genpd->dev_ops.stop && genpd->dev_ops.start)
>>                 ret = pm_runtime_force_resume(dev);
>>
>> --
>> 2.1.4
>>
>
> Kind regards
> Uffe
>