Re: [PATCH v2 3/4] PM / Domains: Take WAKEUP_PATH driver flag into account in genpd

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On 30 December 2017 at 01:47, Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote:
> On Fri, Dec 29, 2017 at 12:37 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
>> In case the WAKEUP_PATH flag has been set in a later phase than from the
>> ->suspend() callback, the PM core don't set the ->power.wakeup_path status
>> flag for the device. Therefore, let's be safe and check it explicitly.
>>
>> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
>> ---
>>  drivers/base/power/domain.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
>> index f9dcc98..32b4ba7 100644
>> --- a/drivers/base/power/domain.c
>> +++ b/drivers/base/power/domain.c
>> @@ -1038,7 +1038,9 @@ static int genpd_finish_suspend(struct device *dev, bool poweroff)
>>         if (IS_ERR(genpd))
>>                 return -EINVAL;
>>
>> -       if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
>> +       if ((dev->power.wakeup_path ||
>> +           dev_pm_test_driver_flags(dev, DPM_FLAG_WAKEUP_PATH)) &&
>
> Shouldn't dev->power.wakeup_path be always set if DPM_FLAG_WAKEUP_PATH
> is set as per the second patch in the series?

Not if DPM_FLAG_WAKEUP_PATH is set from a driver's ->suspend_late() callback.

To do that, the PM core would need to be adopted to set/propagate the
"wakeup_path" flag at __device_suspend_late(), similar to what is done
at __device_suspend().

[...]

Kind regards
Uffe



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