linux-kernel - [Patch v6 1/2] ACPI: thermal: Add Thermal fast Sampling Period (

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Date:   Fri, 10 Nov 2023 00:03:21 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <rafael@...nel.org>, <rui.zhang@...el.com>, <lenb@...nel.org>,
        <lpieralisi@...nel.org>, <guohanjun@...wei.com>,
        <sudeep.holla@....com>, <linux-acpi@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <treding@...dia.com>, <jonathanh@...dia.com>, <bbasu@...dia.com>,
        <sumitg@...dia.com>, <sanjayc@...dia.com>, <ksitaraman@...dia.com>,
        <srikars@...dia.com>, <jbrasen@...dia.com>
Subject: [Patch v6 1/2] ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support

From: Jeff Brasen <jbrasen@...dia.com>

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@...dia.com>
Co-developed-by: Sumit Gupta <sumitg@...dia.com>
Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/acpi/thermal.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index f74d81abdbfc..3b75eb2260d7 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 delay;
 };
 
 struct acpi_thermal_active {
@@ -404,11 +404,17 @@ 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;
 }
@@ -904,7 +910,7 @@ 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);
-- 
2.17.1