diff options
Diffstat (limited to 'target/linux/mediatek/patches/0020-thermal-thermal-Add-support-for-hardware-tracked-tri.patch')
| -rw-r--r-- | target/linux/mediatek/patches/0020-thermal-thermal-Add-support-for-hardware-tracked-tri.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches/0020-thermal-thermal-Add-support-for-hardware-tracked-tri.patch b/target/linux/mediatek/patches/0020-thermal-thermal-Add-support-for-hardware-tracked-tri.patch new file mode 100644 index 0000000..6a48350 --- /dev/null +++ b/target/linux/mediatek/patches/0020-thermal-thermal-Add-support-for-hardware-tracked-tri.patch @@ -0,0 +1,124 @@ +From 346632bc00fe71c269709702fecb474bb22e933e Mon Sep 17 00:00:00 2001 +From: Sascha Hauer <s.hauer@pengutronix.de> +Date: Wed, 13 May 2015 10:52:39 +0200 +Subject: [PATCH 20/76] thermal: thermal: Add support for hardware-tracked + trip points + +This adds support for hardware-tracked trip points to the device tree +thermal sensor framework. + +The framework supports an arbitrary number of trip points. Whenever +the current temperature is updated, the trip points immediately +below and above the current temperature are found. A .set_trips +callback is then called with the temperatures. If there is no trip +point above or below the current temperature, the passed trip +temperature will be -INT_MAX or INT_MAX respectively. In this callback, +the driver should program the hardware such that it is notified +when either of these trip points are triggered. When a trip point +is triggered, the driver should call `thermal_zone_device_update' +for the respective thermal zone. This will cause the trip points +to be updated again. + +If .set_trips is not implemented, the framework behaves as before. + +This patch is based on an earlier version from Mikko Perttunen +<mikko.perttunen@kapsi.fi> + +Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> +--- + drivers/thermal/thermal_core.c | 43 ++++++++++++++++++++++++++++++++++++++++ + include/linux/thermal.h | 3 +++ + 2 files changed, 46 insertions(+) + +diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c +index 6bbf61f..3ae1795 100644 +--- a/drivers/thermal/thermal_core.c ++++ b/drivers/thermal/thermal_core.c +@@ -453,6 +453,45 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp) + } + EXPORT_SYMBOL_GPL(thermal_zone_get_temp); + ++static void thermal_zone_set_trips(struct thermal_zone_device *tz) ++{ ++ int low = -INT_MAX; ++ int high = INT_MAX; ++ int trip_temp, hysteresis; ++ int temp = tz->temperature; ++ int i; ++ ++ if (!tz->ops->set_trips) ++ return; ++ ++ /* No need to change trip points */ ++ if (temp > tz->prev_low_trip && temp < tz->prev_high_trip) ++ return; ++ ++ for (i = 0; i < tz->trips; i++) { ++ int trip_low; ++ ++ tz->ops->get_trip_temp(tz, i, &trip_temp); ++ tz->ops->get_trip_hyst(tz, i, &hysteresis); ++ ++ trip_low = trip_temp - hysteresis; ++ ++ if (trip_low < temp && trip_low > low) ++ low = trip_low; ++ ++ if (trip_temp > temp && trip_temp < high) ++ high = trip_temp; ++ } ++ ++ tz->prev_low_trip = low; ++ tz->prev_high_trip = high; ++ ++ dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n", ++ low, high); ++ ++ tz->ops->set_trips(tz, low, high); ++} ++ + void thermal_zone_device_update(struct thermal_zone_device *tz) + { + int temp, ret, count; +@@ -479,6 +518,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) + dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n", + tz->last_temperature, tz->temperature); + ++ thermal_zone_set_trips(tz); ++ + for (count = 0; count < tz->trips; count++) + handle_thermal_trip(tz, count); + } +@@ -1494,6 +1535,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type, + tz->trips = trips; + tz->passive_delay = passive_delay; + tz->polling_delay = polling_delay; ++ tz->prev_low_trip = INT_MAX; ++ tz->prev_high_trip = -INT_MAX; + + dev_set_name(&tz->device, "thermal_zone%d", tz->id); + result = device_register(&tz->device); +diff --git a/include/linux/thermal.h b/include/linux/thermal.h +index 07bd5e8..aef6e13 100644 +--- a/include/linux/thermal.h ++++ b/include/linux/thermal.h +@@ -87,6 +87,7 @@ struct thermal_zone_device_ops { + int (*unbind) (struct thermal_zone_device *, + struct thermal_cooling_device *); + int (*get_temp) (struct thermal_zone_device *, int *); ++ int (*set_trips) (struct thermal_zone_device *, int, int); + int (*get_mode) (struct thermal_zone_device *, + enum thermal_device_mode *); + int (*set_mode) (struct thermal_zone_device *, +@@ -180,6 +181,8 @@ struct thermal_zone_device { + int last_temperature; + int emul_temperature; + int passive; ++ int prev_low_trip; ++ int prev_high_trip; + unsigned int forced_passive; + const struct thermal_zone_device_ops *ops; + const struct thermal_zone_params *tzp; +-- +1.7.10.4 + |