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From: Sumit Gupta <sumitg@nvidia.com>
To: <rafael@kernel.org>, <rui.zhang@intel.com>, <lenb@kernel.org>,
	<lpieralisi@kernel.org>, <guohanjun@huawei.com>,
	<sudeep.holla@arm.com>, <linux-acpi@vger.kernel.org>,
	<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Cc: <treding@nvidia.com>, <jonathanh@nvidia.com>, <bbasu@nvidia.com>,
	<sumitg@nvidia.com>, <sanjayc@nvidia.com>,
	<ksitaraman@nvidia.com>, <srikars@nvidia.com>,
	<jbrasen@nvidia.com>
Subject: [Patch v6 1/2] ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support
Date: Fri, 10 Nov 2023 00:03:21 +0530	[thread overview]
Message-ID: <20231109183322.28039-2-sumitg@nvidia.com> (raw)
In-Reply-To: <20231109183322.28039-1-sumitg@nvidia.com>

From: Jeff Brasen <jbrasen@nvidia.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@nvidia.com>
Co-developed-by: Sumit Gupta <sumitg@nvidia.com>
Signed-off-by: Sumit Gupta <sumitg@nvidia.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


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  reply	other threads:[~2023-11-09 18:34 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-09 18:33 [Patch v6 0/2] Add support for _TFP and change throttle pctg Sumit Gupta
2023-11-09 18:33 ` Sumit Gupta [this message]
2023-11-21 19:59   ` [Patch v6 1/2] ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support Rafael J. Wysocki
2023-11-22 12:55     ` Sumit Gupta
2023-11-22 13:34       ` Rafael J. Wysocki
2023-11-09 18:33 ` [Patch v6 2/2] ACPI: processor: reduce CPUFREQ thermal reduction pctg for Tegra241 Sumit Gupta
2023-11-10 10:15   ` Sudeep Holla
2023-11-17 10:38     ` Sumit Gupta

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