On Sat, Oct 14, 2023 at 12:54 PM Sumit Gupta <sumitg@xxxxxxxxxx> wrote:
>
> From: Jeff Brasen <jbrasen@xxxxxxxxxx>
>
> Add support of "Thermal fast Sampling Period (_TFP)" for Passive cooling.
> As per [1], _TFP overrides the "Thermal Sampling Period (_TSP)" if both
> are present in a Thermal zone.
>
> [1] ACPI Specification 6.4 - section 11.4.17. _TFP (Thermal fast Sampling
> Period)"
>
> Signed-off-by: Jeff Brasen <jbrasen@xxxxxxxxxx>
> Signed-off-by: Sumit Gupta <sumitg@xxxxxxxxxx>
> ---
> drivers/acpi/thermal.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index d98ff69303b3..a91e3d566858 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -90,7 +90,7 @@ struct acpi_thermal_passive {
> struct acpi_thermal_trip trip;
> unsigned long tc1;
> unsigned long tc2;
> - unsigned long tsp;
> + unsigned long passive_delay;
This is a passive trip structure anyway, so the "passive_" prefix is
redundant here. "delay" alone would be fine.
> };
>
> struct acpi_thermal_active {
> @@ -404,11 +404,16 @@ static bool passive_trip_params_init(struct acpi_thermal *tz)
>
> tz->trips.passive.tc2 = tmp;
>
> - status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
> - if (ACPI_FAILURE(status))
> - return false;
> + status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
> + if (ACPI_FAILURE(status)) {
> + status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
> + if (ACPI_FAILURE(status))
> + return false;
>
> - tz->trips.passive.tsp = tmp;
> + tz->trips.passive.passive_delay = tmp * 100;
> + } else {
> + tz->trips.passive.passive_delay = tmp;
> + }
I would prefer the if () statement above to be structured the other
way around, that is
status = ...
if (ACPI_SUCCESS(status)) {
tz->trips.passive.delay = tmp;
return true;
}
status = ...
if (ACPI_FAILURE(status))
return false;
etc.
>
> return true;
> }
> @@ -904,7 +909,7 @@ 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.passive_delay;
>
> trip->type = THERMAL_TRIP_PASSIVE;
> trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
> --
> 2.17.1
>
