ACPI: thermal: create "thermal.psv=" to override passive trip points

[firefly-linux-kernel-4.4.55.git] / drivers / acpi / thermal.c

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index b6b3bec845473f68ac88576c38be0a12430ff46e..74e25be8abc9ad0eaa132318461da72f67ab6b91 100644 (file)
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -82,6 +82,10 @@ static int off;
 module_param(off, int, 0);
 MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.\n");
 
+static int psv;
+module_param(psv, int, 0644);
+MODULE_PARM_DESC(psv, "Disable or override all passive trip points.\n");
+
 static int acpi_thermal_add(struct acpi_device *device);
 static int acpi_thermal_remove(struct acpi_device *device, int type);
 static int acpi_thermal_resume(struct acpi_device *device);
@@ -343,9 +347,16 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
 
        /* Passive: Processors (optional) */
 
-       status =
-           acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
-                                 &tz->trips.passive.temperature);
+       if (psv == -1) {
+               status = AE_SUPPORT;
+       } else if (psv > 0) {
+               tz->trips.passive.temperature = CELSIUS_TO_KELVIN(psv);
+               status = AE_OK;
+       } else {
+               status = acpi_evaluate_integer(tz->device->handle,
+                       "_PSV", NULL, &tz->trips.passive.temperature);
+       }
+
        if (ACPI_FAILURE(status)) {
                tz->trips.passive.flags.valid = 0;
                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));