Verify thermal state

Thermal logging helps to understand the active configurations of the thermal zones and the existing thermal mitigation levels. To retrieve thermal configuration and active mitigation levels, use ftrace logs.

ftrace method

To enable thermal ftrace logs, run the following commands:

echo 1 > /sys/kernel/tracing/events/thermal/enable

QCS6490/QCS5430
IQ-9075

The following are the log snippets of different thermal events:

/* In the following snippet, "cpu0-thermal" represents thermal zone and “temp” indicates existing temperature of thermal zone */
sh-1420    [001] ..... 1132975.934216: thermal_temperature: thermal_zone=cpu0-thermal id=13 temp_prev=47700 temp=110000
/*In the following snippet, “trip” indicates trip level and trip level 1 is triggered for cpu0-thermal thermal zone*/
sh-1420    [001] ..... 1132975.934449: thermal_zone_trip: thermal_zone=cpu0-thermal id=13 trip=1 trip_type=PASSIVE
/*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
sh-1420 [001] ..... 1132975.934473: cdev_update: type=idle-cpu0 target=100

The following are the log snippets of mitigation trigger and clear thermal events for IQ-9075:

/* In the following snippet, " cpu-1-2-1-thermal" represents thermal zone
and “trip” indicates trip level and trip level 1 is triggered for
cpu-1-2-1-thermal thermal zone*/
irq/222-c252000-115     [000] ..... 250901.340001:
thermal_zone_trip: thermal_zone=cpu-1-2-1-thermal
id=16 trip=1 trip_type=PASSIVE
/*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
irq/222-c252000-115     [000] ..... 250901.340009: cdev_update: type=idle-cpu6 target=100 kworker/u17:0-23271   [000] ..... 250901.355101:
thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=34100
kworker/u17:0-23271   [000] ..... 250901.339084: thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=29800
kworker/u17:0-23271   [000] ..... 250901.339139: cdev_update: type=idle-cpu6 target=0

Note The log snippet for IQ-8275 and IQ-615 will be updated in a future release.

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ftrace method

​ftrace method

ftrace method