diff options
| author | Zhang Rui <rui.zhang@intel.com> | 2012-06-27 09:54:33 +0800 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-11-05 10:09:54 -0800 |
| commit | 594e7fef602d51b856816d53642a354371810dd6 (patch) | |
| tree | 7e0ab35b6dfa0b5eff77ba341fdd4fa96b3307d0 /drivers/thermal | |
| parent | 7cc148ee926bf271f49332b5d18f62f718a4f407 (diff) | |
Thermal: Introduce .get_trend() callback.
According to ACPI spec, tc1 and tc2 are used by OSPM
to anticipate the temperature trends.
We introduced the same concept to the generic thermal layer
for passive cooling, but now it seems that these values
are hard to be used on other platforms.
So We introduce .get_trend() as a more general solution.
For the platform thermal drivers that have their own way to
anticipate the temperature trends, they should provide
their own .get_trend() callback.
Or else, we will calculate the temperature trends by simply
comparing the current temperature and the cached previous
temperature reading.
bug 1059470
Change-Id: I85ca51d87ae8fde8429a83399a81979a41913218
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Valentin, Eduardo <eduardo.valentin@ti.com>
Reviewed-on: http://git-master/r/159965
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Joshua Primero <jprimero@nvidia.com>
Tested-by: Joshua Primero <jprimero@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/thermal_sys.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index db79db9a9f3d..07b1add0930e 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -723,6 +723,20 @@ static void thermal_zone_device_passive(struct thermal_zone_device *tz, struct thermal_cooling_device *cdev; long state, max_state; + if (!tz->ops->get_trend || + tz->ops->get_trend(tz, trip, (enum thermal_trend *)&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? * ----------- @@ -1091,6 +1105,9 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) goto leave; } + tz->last_temperature = tz->temperature; + tz->temperature = temp; + for (count = 0; count < tz->trips; count++) { tz->ops->get_trip_type(tz, count, &trip_type); tz->ops->get_trip_temp(tz, count, &trip_temp); @@ -1150,8 +1167,6 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) thermal_zone_device_passive(tz, temp, tz->forced_passive, THERMAL_TRIPS_NONE); - tz->last_temperature = temp; - leave: if (tz->passive) thermal_zone_device_set_polling(tz, tz->passive_delay); |