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Commit aed3f249 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Zhang Rui
Browse files

thermal: intel_pch_thermal: Add an ACPI passive trip 



On the platforms which has an ACPI companion device associated with
PCH thermal device, read passive trip temperature via ACPI _PSV
control method.

Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 1001354c

drivers/thermal/intel_pch_thermal.c

+51 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/types.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/acpi.h>

#include <linux/thermal.h>

#include <linux/pm.h>
@@ -66,9 +67,53 @@ struct pch_thermal_device { 
	unsigned long crt_temp;

	int hot_trip_id;

	unsigned long hot_temp;

	int psv_trip_id;

	unsigned long psv_temp;

	bool bios_enabled;

};



#ifdef CONFIG_ACPI



/*

 * On some platforms, there is a companion ACPI device, which adds

 * passive trip temperature using _PSV method. There is no specific

 * passive temperature setting in MMIO interface of this PCI device.

 */

static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,

				      int *nr_trips)

{

	struct acpi_device *adev;



	ptd->psv_trip_id = -1;



	adev = ACPI_COMPANION(&ptd->pdev->dev);

	if (adev) {

		unsigned long long r;

		acpi_status status;



		status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,

					       &r);

		if (ACPI_SUCCESS(status)) {

			unsigned long trip_temp;



			trip_temp = DECI_KELVIN_TO_MILLICELSIUS(r);

			if (trip_temp) {

				ptd->psv_temp = trip_temp;

				ptd->psv_trip_id = *nr_trips;

				++(*nr_trips);

			}

		}

	}

}

#else

static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,

				      int *nr_trips)

{

	ptd->psv_trip_id = -1;



}

#endif



static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)

{

	u8 tsel;
@@ -119,6 +164,8 @@ static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips) 
		++(*nr_trips);

	}



	pch_wpt_add_acpi_psv_trip(ptd, nr_trips);



	return 0;

}
@@ -194,6 +241,8 @@ static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip, 
		*type = THERMAL_TRIP_CRITICAL;

	else if (ptd->hot_trip_id == trip)

		*type = THERMAL_TRIP_HOT;

	else if (ptd->psv_trip_id == trip)

		*type = THERMAL_TRIP_PASSIVE;

	else

		return -EINVAL;
@@ -208,6 +257,8 @@ static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *tem 
		*temp = ptd->crt_temp;

	else if (ptd->hot_trip_id == trip)

		*temp = ptd->hot_temp;

	else if (ptd->psv_trip_id == trip)

		*temp = ptd->psv_temp;

	else

		return -EINVAL;