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Subject[PATCH 4/4] thermal: step_wise: Extend thermal step-wise governor to monitor falling temperature.
Date
From the step wise governor point of view, the policy decisions
that has to taken on a thermal trip point that is defined to be monitored
for falling temprature is the mirror opposite of the decisions it has
to take on a trip point that is monitored for rising temperature.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---
drivers/thermal/step_wise.c | 59 +++++++++++++++++++++++++++++++++------------
1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 6e051cb..aa8e0a0 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -35,7 +35,8 @@
* deactivate the thermal instance
*/
static unsigned long get_target_state(struct thermal_instance *instance,
- enum thermal_trend trend, bool throttle)
+ enum thermal_trend trend, bool throttle,
+ enum thermal_trip_monitor_type type)
{
struct thermal_cooling_device *cdev = instance->cdev;
unsigned long cur_state;
@@ -65,11 +66,21 @@ static unsigned long get_target_state(struct thermal_instance *instance,

switch (trend) {
case THERMAL_TREND_RAISING:
- if (throttle) {
- next_target = cur_state < instance->upper ?
- (cur_state + 1) : instance->upper;
- if (next_target < instance->lower)
- next_target = instance->lower;
+ if (type == THERMAL_TRIP_MONITOR_FALLING) {
+ if (cur_state <= instance->lower) {
+ if (!throttle)
+ next_target = THERMAL_NO_TARGET;
+ } else {
+ if (!throttle)
+ next_target = cur_state - 1;
+ }
+ } else {
+ if (throttle) {
+ next_target = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ if (next_target < instance->lower)
+ next_target = instance->lower;
+ }
}
break;
case THERMAL_TREND_RAISE_FULL:
@@ -77,14 +88,23 @@ static unsigned long get_target_state(struct thermal_instance *instance,
next_target = instance->upper;
break;
case THERMAL_TREND_DROPPING:
- if (cur_state <= instance->lower) {
- if (!throttle)
- next_target = THERMAL_NO_TARGET;
+ if (type == THERMAL_TRIP_MONITOR_FALLING) {
+ if (throttle) {
+ next_target = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ if (next_target < instance->lower)
+ next_target = instance->lower;
+ }
} else {
- if (!throttle) {
- next_target = cur_state - 1;
- if (next_target > instance->upper)
- next_target = instance->upper;
+ if (cur_state <= instance->lower) {
+ if (!throttle)
+ next_target = THERMAL_NO_TARGET;
+ } else {
+ if (!throttle) {
+ next_target = cur_state - 1;
+ if (next_target > instance->upper)
+ next_target = instance->upper;
+ }
}
}
break;
@@ -117,6 +137,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
{
int trip_temp;
enum thermal_trip_type trip_type;
+ enum thermal_trip_monitor_type monitor_type =
+ THERMAL_TRIP_MONITOR_RISING;
enum thermal_trend trend;
struct thermal_instance *instance;
bool throttle = false;
@@ -130,9 +152,15 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
tz->ops->get_trip_type(tz, trip, &trip_type);
}

+ if (tz->ops->get_trip_monitor_type)
+ tz->ops->get_trip_monitor_type(tz, trip, &monitor_type);
+
trend = get_tz_trend(tz, trip);

- if (tz->temperature >= trip_temp) {
+ if (((monitor_type == THERMAL_TRIP_MONITOR_RISING) &&
+ (tz->temperature >= trip_temp)) ||
+ ((monitor_type == THERMAL_TRIP_MONITOR_FALLING) &&
+ (tz->temperature <= trip_temp))) {
throttle = true;
trace_thermal_zone_trip(tz, trip, trip_type);
}
@@ -147,7 +175,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
continue;

old_target = instance->target;
- instance->target = get_target_state(instance, trend, throttle);
+ instance->target = get_target_state(instance, trend, throttle,
+ monitor_type);
dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
old_target, (int)instance->target);

--
2.1.4
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