ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support

Add support of "Thermal fast Sampling Period (_TFP)" for passive
cooling.

As per the ACPI specification (ACPI 6.5, Section 11.4.17 "_TFP (Thermal
fast Sampling Period)", _TFP overrides _TSP ("Thermal Sampling Period"
if both are present in a Thermal zone.

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Co-developed-by: Sumit Gupta <sumitg@nvidia.com>
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 6c29a266dbd0b3a1a74449706ddf5c959ec65888..ee28ca93d9834569d03c092166a3e2af4730c402 100644 (file)
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -92,7 +92,7 @@ struct acpi_thermal_passive {
        struct acpi_thermal_trip trip;
        unsigned long tc1;
        unsigned long tc2;
-       unsigned long tsp;
+       unsigned long delay;
 };
 
 struct acpi_thermal_active {
@@ -396,11 +396,17 @@ static bool passive_trip_params_init(struct acpi_thermal *tz)
 
        tz->trips.passive.tc2 = tmp;
 
+       status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
+       if (ACPI_SUCCESS(status)) {
+               tz->trips.passive.delay = tmp;
+               return true;
+       }
+
        status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
        if (ACPI_FAILURE(status))
                return false;
 
-       tz->trips.passive.tsp = tmp;
+       tz->trips.passive.delay = tmp * 100;
 
        return true;
 }
@@ -896,7 +902,7 @@ static int acpi_thermal_add(struct acpi_device *device)
 
        acpi_trip = &tz->trips.passive.trip;
        if (acpi_thermal_trip_valid(acpi_trip)) {
-               passive_delay = tz->trips.passive.tsp * 100;
+               passive_delay = tz->trips.passive.delay;
 
                trip->type = THERMAL_TRIP_PASSIVE;
                trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);