From aed3f249f93fe15f16242bbd4e6c3931674b8d91 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Mon, 3 Oct 2016 12:36:24 -0700 Subject: [PATCH] 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: Srinivas Pandruvada Signed-off-by: Zhang Rui --- drivers/thermal/intel_pch_thermal.c | 51 +++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/drivers/thermal/intel_pch_thermal.c b/drivers/thermal/intel_pch_thermal.c index 9b4815e81b0d..5cf644a2c012 100644 --- a/drivers/thermal/intel_pch_thermal.c +++ b/drivers/thermal/intel_pch_thermal.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -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; -- 2.45.2