From: Len Brown <lenb@kernel.org>
To: linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>
Subject: [PATCH 12/30] Thermal: Unify the code for both active and passive cooling
Date: Tue, 9 Oct 2012 01:54:02 -0400 [thread overview]
Message-ID: <908b9fb792b77663a007af240e7ee89460de2025.1349761836.git.len.brown@intel.com> (raw)
In-Reply-To: <1349762060-25334-1-git-send-email-lenb@kernel.org>
In-Reply-To: <e3f25e6e5836c4790fbe395ff42e241f372d859d.1349761836.git.len.brown@intel.com>
From: Zhang Rui <rui.zhang@intel.com>
Remove thermal_zone_device_passive(). And use
thermal_zone_trip_update() and thermal_zone_do_update()
for both active and passive cooling.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Eduardo Valentin <eduardo.valentin@ti.com>
---
drivers/thermal/thermal_sys.c | 110 ++++++++++--------------------------------
include/linux/thermal.h | 2 +-
2 files changed, 26 insertions(+), 86 deletions(-)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 36ae2f4..6e9d3dc 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -715,84 +715,6 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
msecs_to_jiffies(delay));
}
-static void thermal_zone_device_passive(struct thermal_zone_device *tz,
- int temp, int trip_temp, int trip)
-{
- enum thermal_trend trend;
- struct thermal_instance *instance;
- struct thermal_cooling_device *cdev;
- long state, max_state;
-
- if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
- /*
- * compare the current temperature and previous temperature
- * to get the thermal trend, if no special requirement
- */
- if (tz->temperature > tz->last_temperature)
- trend = THERMAL_TREND_RAISING;
- else if (tz->temperature < tz->last_temperature)
- trend = THERMAL_TREND_DROPPING;
- else
- trend = THERMAL_TREND_STABLE;
- }
-
- /*
- * Above Trip?
- * -----------
- * Calculate the thermal trend (using the passive cooling equation)
- * and modify the performance limit for all passive cooling devices
- * accordingly. Note that we assume symmetry.
- */
- if (temp >= trip_temp) {
- tz->passive = true;
-
- /* Heating up? */
- if (trend == THERMAL_TREND_RAISING) {
- list_for_each_entry(instance, &tz->thermal_instances,
- tz_node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state++ < max_state)
- cdev->ops->set_cur_state(cdev, state);
- }
- } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
- list_for_each_entry(instance, &tz->thermal_instances,
- tz_node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state > 0)
- cdev->ops->set_cur_state(cdev, --state);
- }
- }
- return;
- }
-
- /*
- * Below Trip?
- * -----------
- * Implement passive cooling hysteresis to slowly increase performance
- * and avoid thrashing around the passive trip point. Note that we
- * assume symmetry.
- */
- list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
- if (instance->trip != trip)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &state);
- cdev->ops->get_max_state(cdev, &max_state);
- if (state > 0)
- cdev->ops->set_cur_state(cdev, --state);
- if (state == 0)
- tz->passive = false;
- }
-}
-
static void thermal_zone_device_check(struct work_struct *work)
{
struct thermal_zone_device *tz = container_of(work, struct
@@ -1114,7 +1036,7 @@ static void thermal_zone_do_update(struct thermal_zone_device *tz)
}
/*
- * Cooling algorithm for active trip points
+ * Cooling algorithm for both active and passive cooling
*
* 1. if the temperature is higher than a trip point,
* a. if the trend is THERMAL_TREND_RAISING, use higher cooling
@@ -1136,9 +1058,16 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
struct thermal_cooling_device *cdev = NULL;
unsigned long cur_state, max_state;
long trip_temp;
+ enum thermal_trip_type trip_type;
enum thermal_trend trend;
- tz->ops->get_trip_temp(tz, trip, &trip_temp);
+ if (trip == THERMAL_TRIPS_NONE) {
+ trip_temp = tz->forced_passive;
+ trip_type = THERMAL_TRIPS_NONE;
+ } else {
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+ tz->ops->get_trip_type(tz, trip, &trip_type);
+ }
if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
/*
@@ -1170,6 +1099,13 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
cur_state = cur_state > instance->lower ?
(cur_state - 1) : instance->lower;
}
+
+ /* activate a passive thermal instance */
+ if ((trip_type == THERMAL_TRIP_PASSIVE ||
+ trip_type == THERMAL_TRIPS_NONE) &&
+ instance->target == THERMAL_NO_TARGET)
+ tz->passive++;
+
instance->target = cur_state;
cdev->updated = false; /* cooling device needs update */
}
@@ -1186,6 +1122,12 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
cur_state = cur_state > instance->lower ?
(cur_state - 1) : THERMAL_NO_TARGET;
+
+ /* deactivate a passive thermal instance */
+ if ((trip_type == THERMAL_TRIP_PASSIVE ||
+ trip_type == THERMAL_TRIPS_NONE) &&
+ cur_state == THERMAL_NO_TARGET)
+ tz->passive--;
instance->target = cur_state;
cdev->updated = false; /* cooling device needs update */
}
@@ -1242,16 +1184,14 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
break;
case THERMAL_TRIP_PASSIVE:
if (temp >= trip_temp || tz->passive)
- thermal_zone_device_passive(tz, temp,
- trip_temp, count);
+ thermal_zone_trip_update(tz, count, temp);
break;
}
}
- thermal_zone_do_update(tz);
if (tz->forced_passive)
- thermal_zone_device_passive(tz, temp, tz->forced_passive,
- THERMAL_TRIPS_NONE);
+ thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
+ thermal_zone_do_update(tz);
leave:
if (tz->passive)
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index de0515a..76d0fe8 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -121,7 +121,7 @@ struct thermal_zone_device {
int polling_delay;
int temperature;
int last_temperature;
- bool passive;
+ int passive;
unsigned int forced_passive;
const struct thermal_zone_device_ops *ops;
struct list_head thermal_instances;
--
1.8.0.rc1
next prev parent reply other threads:[~2012-10-09 6:09 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-09 5:53 ACPI & Thermal patches for Linux-3.7-merge Len Brown
2012-10-09 5:53 ` [PATCH 01/30] Thermal: Introduce multiple cooling states support Len Brown
2012-10-09 5:53 ` [PATCH 02/30] Thermal: Introduce cooling states range support Len Brown
2012-10-09 5:53 ` [PATCH 03/30] Thermal: set upper and lower limits Len Brown
2012-10-09 5:53 ` [PATCH 04/30] Thermal: Introduce .get_trend() callback Len Brown
2012-10-09 5:53 ` [PATCH 05/30] Thermal: Remove tc1/tc2 in generic thermal layer Len Brown
2012-10-09 5:53 ` [PATCH 06/30] Thermal: Introduce thermal_zone_trip_update() Len Brown
2012-10-09 5:53 ` [PATCH 07/30] Thermal: rename structure thermal_cooling_device_instance to thermal_instance Len Brown
2012-10-09 5:53 ` [PATCH 08/30] Thermal: Rename thermal_zone_device.cooling_devices Len Brown
2012-10-09 5:53 ` [PATCH 09/30] Thermal: Rename thermal_instance.node to thermal_instance.tz_node Len Brown
2012-10-09 5:54 ` [PATCH 10/30] Thermal: List thermal_instance in thermal_cooling_device Len Brown
2012-10-09 5:54 ` [PATCH 11/30] Thermal: Introduce simple arbitrator for setting device cooling state Len Brown
2012-10-09 5:54 ` Len Brown [this message]
2012-10-09 5:54 ` [PATCH 13/30] Thermal: Introduce locking for cdev.thermal_instances list Len Brown
2012-10-09 5:54 ` [PATCH 14/30] thermal: fix potential out-of-bounds memory access Len Brown
2012-10-09 5:54 ` [PATCH 15/30] thermal: add Renesas R-Car thermal sensor support Len Brown
2012-10-09 5:54 ` [PATCH 16/30] thermal: Fix potential NULL pointer accesses Len Brown
2012-10-09 5:54 ` [PATCH 17/30] Fix a build error Len Brown
2012-10-09 5:54 ` [PATCH 18/30] thermal: add generic cpufreq cooling implementation Len Brown
2012-10-09 5:54 ` [PATCH 19/30] hwmon: exynos4: move thermal sensor driver to driver/thermal directory Len Brown
2012-10-09 5:54 ` [PATCH 20/30] thermal: exynos5: add exynos5250 thermal sensor driver support Len Brown
2012-10-09 5:54 ` [PATCH 21/30] thermal: exynos: register the tmu sensor with the kernel thermal layer Len Brown
2012-10-09 5:54 ` [PATCH 22/30] ARM: exynos: add thermal sensor driver platform data support Len Brown
2012-10-09 5:54 ` [PATCH 23/30] thermal: exynos: Use devm_* functions Len Brown
2012-10-09 5:54 ` [PATCH 24/30] Thermal: Fix bug on cpu_cooling, cooling device's id conflict problem Len Brown
2012-10-09 5:54 ` [PATCH 25/30] thermal: Exynos: Fix NULL pointer dereference in exynos_unregister_thermal() Len Brown
2012-10-09 5:54 ` [PATCH 26/30] ACPI: EC: Make the GPE storm threshold a module parameter Len Brown
2012-10-09 5:54 ` [PATCH 27/30] ACPI: EC: Add a quirk for CLEVO M720T/M730T laptop Len Brown
2012-10-09 6:16 ` Jonathan Nieder
2012-10-09 6:22 ` Feng Tang
2012-10-09 6:59 ` Jonathan Nieder
2012-10-09 7:19 ` Feng Tang
2012-10-09 5:54 ` [PATCH 28/30] cpuidle / ACPI: fix potential NULL pointer dereference Len Brown
2012-10-09 5:54 ` [PATCH 29/30] ACPI idle, CPU hotplug: Fix NULL pointer dereference during hotplug Len Brown
2012-10-09 5:54 ` [PATCH 30/30] tools/power/acpi/acpidump: remove duplicated include from acpidump.c Len Brown
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