linux-kernel - Re: [Patch 1/2] ACPI: thermal: Add Thermal fast Sampling Period (

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Date:   Mon, 21 Aug 2023 17:18:43 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     <rui.zhang@...el.com>, <lenb@...nel.org>, <treding@...dia.com>,
        <jonathanh@...dia.com>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sanjayc@...dia.com>,
        <ksitaraman@...dia.com>, <srikars@...dia.com>,
        <jbrasen@...dia.com>, <bbasu@...dia.com>,
        Sumit Gupta <sumitg@...dia.com>
Subject: Re: [Patch 1/2] ACPI: thermal: Add Thermal fast Sampling Period
 (_TFP) support



On 19/08/23 00:03, Rafael J. Wysocki wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Thu, Aug 17, 2023 at 11:30 AM Sumit Gupta <sumitg@...dia.com> wrote:
>>
>> From: Jeff Brasen <jbrasen@...dia.com>
>>
>> Add support for Thermal fast Sampling Period (_TFP) for Passive cooling.
>> As per UEFI spec,
> 
> You mean the ACPI spec I suppose?  It would be good to give the
> relevant section number and title.
> 

Yes, It's the ACPI Spec 6.4. Section and title are "11.4.17. _TFP 
(Thermal fast Sampling Period)". I will add it in description in v2.
Thank you for correcting.

>>   _TFP overrides the "Thermal Sampling Period (_TSP)"
>>   if both are present in a Thermal zone.
>>
>> Signed-off-by: Jeff Brasen <jbrasen@...dia.com>
>> Signed-off-by: Sumit Gupta <sumitg@...dia.com>
>> ---
>>   drivers/acpi/thermal.c | 21 ++++++++++++++-------
>>   1 file changed, 14 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
>> index f9f6ebb08fdb..5dee3722509c 100644
>> --- a/drivers/acpi/thermal.c
>> +++ b/drivers/acpi/thermal.c
>> @@ -111,7 +111,7 @@ struct acpi_thermal_passive {
>>          unsigned long temperature;
>>          unsigned long tc1;
>>          unsigned long tc2;
>> -       unsigned long tsp;
>> +       unsigned long sampling_period;
>>          bool valid;
>>   };
>>
>> @@ -289,11 +289,18 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
>>                                          tz->trips.passive.tc2 = tmp;
>>
>>                                  status = acpi_evaluate_integer(tz->device->handle,
>> -                                                              "_TSP", NULL, &tmp);
>> -                               if (ACPI_FAILURE(status))
>> -                                       tz->trips.passive.valid = false;
>> -                               else
>> -                                       tz->trips.passive.tsp = tmp;
>> +                                                              "_TFP", NULL, &tmp);
>> +                               if (ACPI_FAILURE(status)) {
>> +                                       status = acpi_evaluate_integer(tz->device->handle,
>> +                                                                      "_TSP", NULL, &tmp);
>> +                                       if (ACPI_FAILURE(status))
>> +                                               tz->trips.passive.valid = false;
>> +                                       else
>> +                                               tz->trips.passive.sampling_period = tmp * 100;
>> +
>> +                               } else {
>> +                                       tz->trips.passive.sampling_period = tmp;
>> +                               }
>>                          }
>>                  }
>>          }
>> @@ -765,7 +772,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
>>          if (tz->trips.passive.valid)
>>                  tz->thermal_zone = thermal_zone_device_register("acpitz", trips, 0, tz,
>>                                                                  &acpi_thermal_zone_ops, NULL,
>> -                                                               tz->trips.passive.tsp * 100,
>> +                                                               tz->trips.passive.sampling_period,
>>                                                                  tz->polling_frequency * 100);
>>          else
>>                  tz->thermal_zone =
>> --
> 
> So this needs to be rebased on top of the current linux-next branch in
> linux-pm.git or on top of the acpi-thermal branch in there.

Will rebase and send v2.

Thank you,
Sumit Gupta