After thermal zone device registered, as we have not read any
temperature before, thus tz->temperature should not be 0, which actually
means 0C, and thermal trend is not available.
In this case, we need specially handling for the first
thermal_zone_device_update().
Both thermal core framework and step_wise governor is enhanced to handle this.
CC: <stable@xxxxxxxxxxxxxxx> #3.18+
Tested-by: Manuel Krause <manuelkrause@xxxxxxxxxxxx>
Tested-by: szegad <szegadlo@xxxxxxxxxxxxxx>
Tested-by: prash <prash.n.rao@xxxxxxxxx>
Tested-by: amish <ammdispose-arch@xxxxxxxxx>
Tested-by: Matthias <morpheusxyz123@xxxxxxxx>
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
---
drivers/thermal/step_wise.c | 15 +++++++++++++--
drivers/thermal/thermal_core.c | 19 +++++++++++++++++--
drivers/thermal/thermal_core.h | 1 +
include/linux/thermal.h | 3 +++
4 files changed, 34 insertions(+), 4 deletions(-)
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 5a0f12d..c2bb37c 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -63,6 +63,16 @@ static unsigned long get_target_state(struct thermal_instance *instance,
next_target = instance->target;
dev_dbg(&cdev->device, "cur_state=%ld\n", cur_state);
+ if (!instance->initialized) {
+ if (throttle) {
+ next_target = (cur_state + 1) >= instance->upper ?
+ instance->upper :
+ ((cur_state + 1) < instance->lower ?
+ instance->lower : (cur_state + 1));
+ } else
+ next_target = THERMAL_NO_TARGET;
+ }
+
switch (trend) {
case THERMAL_TREND_RAISING:
if (throttle) {
@@ -149,7 +159,8 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
dev_dbg(&instance->cdev->device, "old_target=%d, target=%d\n",
old_target, (int)instance->target);
- if (old_target == instance->target)
+ if (instance->initialized &&
+ old_target == instance->target)
continue;
/* Activate a passive thermal instance */
@@ -161,7 +172,7 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
instance->target == THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, -1);
-
+ instance->initialized = true;
instance->cdev->updated = false; /* cdev needs update */
}
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 174d3bc..9d6f71b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -469,8 +469,22 @@ static void update_temperature(struct thermal_zone_device *tz)
mutex_unlock(&tz->lock);
trace_thermal_temperature(tz);
- dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
- tz->last_temperature, tz->temperature);
+ if (tz->last_temperature == THERMAL_TEMP_INVALID)
+ dev_dbg(&tz->device, "last_temperature N/A, current_temperature=%d\n",
+ tz->temperature);
+ else
+ dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
+ tz->last_temperature, tz->temperature);
+}
+
+static void thermal_zone_device_reset(struct thermal_zone_device *tz)
+{
+ struct thermal_instance *pos;
+
+ tz->temperature = THERMAL_TEMP_INVALID;
+ tz->passive = 0;
+ list_for_each_entry(pos, &tz->thermal_instances, tz_node)
+ pos->initialized = false;
}
void thermal_zone_device_update(struct thermal_zone_device *tz)
@@ -1574,6 +1588,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (!tz->ops->get_temp)
thermal_zone_device_set_polling(tz, 0);
+ thermal_zone_device_reset(tz);
thermal_zone_device_update(tz);
return tz;
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 0531c75..6d9ffa5 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -41,6 +41,7 @@ struct thermal_instance {
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
int trip;
+ bool initialized;
unsigned long upper; /* Highest cooling state for this trip point */
unsigned long lower; /* Lowest cooling state for this trip point */
unsigned long target; /* expected cooling state */
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 5eac316..8650b0b 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -40,6 +40,9 @@
/* No upper/lower limit requirement */
#define THERMAL_NO_LIMIT ((u32)~0)
+/* Invalid/uninitialized temperature */
+#define THERMAL_TEMP_INVALID -27400
+
/* Unit conversion macros */
#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
((long)t-2732+5)/10 : ((long)t-2732-5)/10)
--
1.9.1
--
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