Qualcomm thermal的介绍
點(diǎn)擊打開(kāi)鏈接
隨著智能設(shè)備的發(fā)展，很多產(chǎn)品越做越小，在一塊很小的板子和結(jié)構(gòu)內(nèi)會(huì)附帶很多功能，加上很多應(yīng)用需要處理數(shù)據(jù)很大，必定造成設(shè)備很容易發(fā)熱。且發(fā)熱不僅會(huì)帶來(lái)體驗(yàn)的不足還會(huì)帶來(lái)大量的電量消耗。所以在移動(dòng)消費(fèi)產(chǎn)品，對(duì)熱量的解決方案還是很重要的。今天我們就介紹下高通410C開(kāi)發(fā)板上熱量管理的機(jī)制，軟件如何控制。
?????? 首先在軟件架構(gòu)上我們分為以下部分。
一：驅(qū)動(dòng)部分
驅(qū)動(dòng)代碼位置：
共有部分：kernel/deriver/thermal_core.c
????????????????????kernel/driver/user_space.c
platform部分：
????????????????mitigation部分：
?????????????????kernel/driver/msm_thermal-dev.c
?????????????????kernel/driver/msm_thermal.c
????????????????sensor部分：
????????????????qpnp-temp-alarm.c
????????????????msm8974-tsens.c
簡(jiǎn)要敘述驅(qū)動(dòng)文件關(guān)鍵位置，基本理解驅(qū)動(dòng)構(gòu)架以及如何運(yùn)作。
msm8974-tsens.c
1：sensor的注冊(cè)，將thermal注冊(cè)為class類(lèi)：
2：thermal_zone_device_ops接口的填充，以給thermal_core的調(diào)用。
3：觸發(fā)中斷與通知上層。
thermal_core.c
1：thermal_zone_devices_register（）提供相應(yīng)sensor register接口，按先后順序注冊(cè)/sys/class/thermal/thermal_zoneN。
2：為上層提供trip_temp、type等接口,如： ??
????? root@msm8916_32:/ # cat /sys/class/thermal/thermal_zone5/trip_point_0_type ????
????? configurable_hi
????? root@msm8916_32:/ # cat /sys/class/thermal/thermal_zone5/trip_point_0_temp ????
????? 85
這里trip_point_0_temp為high temp thresthold,那么trip_point_1_temp為low temp thresthold ??
3：調(diào)用sensor相關(guān)接口：
關(guān)于tpye name與thermal_zone的對(duì)應(yīng)關(guān)系：
以8016為例:
???????????????????????????????????type ????????????????????????name ?????????????????????????????????
????????????????????????? thermal_zone0 ??????????battery
????????????????????????? thermal_zone1 ??????????tsens_tz_sensor0
????????????????????????? thermal_zone2 ??????????tsens_tz_sensor1
????????????????????????? thermal_zone3 ??????????tsens_tz_sensor2 ???????pop_mem
????????????????????????? thermal_zone4 ??????????tsens_tz_sensor4 ???????cpu2-3
????????????????????????? thermal_zone5 ??????????tsens_tz_sensor5 ???????cpu0-1
????????????????????????? thermal_zone6 ??????????pm8916_tz
????????????????????????? thermal_zone7 ??????????bms
msm_thermal.c
mitigation分為輪訓(xùn)與中斷，首先看下poll部分：
每隔指定的時(shí)間就會(huì)check溫度，當(dāng)超過(guò)范圍會(huì)降頻,關(guān)閉cpu，重設(shè)thsreshold等操作。
interrupt部分，默認(rèn)啟動(dòng)的是中斷方式，這里是interrupt的初始化。
再以hotplug細(xì)說(shuō)interrupt的運(yùn)行，這里會(huì)根據(jù)dts里面的參數(shù)先設(shè)置，后通過(guò)set_threshold調(diào)用之前sensor填充的接口,寫(xiě)入到寄存器里面，當(dāng)達(dá)到溫度后，觸發(fā)中斷后會(huì)通知上層，再溫度非常高的話會(huì)運(yùn)行起kernel mitigation，通過(guò)hotplug notify來(lái)做相應(yīng)處理
二：上層thermal-engine部分：
?
???????thermal工作機(jī)制：首先上層設(shè)置trig point，包括恢復(fù)溫度與臨界溫度，thermal engine主要有algo_monitor運(yùn)作sensor monitor起輔助作用夠成。algo_monitor依賴(lài)?sensor_monitor的運(yùn)作,而sensor_monitor的運(yùn)行依賴(lài)中斷的觸發(fā)。
1：首先初始化engine,設(shè)置臨界溫度（85度）其它參數(shù)等信息。
2：當(dāng)溫度升高達(dá)到臨界溫度，底層中斷觸發(fā)同時(shí)通知上層，algo_monitor由block狀態(tài)到運(yùn)行起來(lái)，同時(shí)啟動(dòng)50ms的timer來(lái)采樣sensor的溫度:
a:當(dāng)溫度大于trig point時(shí)，cpu開(kāi)始降頻，每次溫度下降一個(gè)等級(jí)。
b:當(dāng)溫度小于trig point時(shí)，cpu可以恢復(fù)到max狀態(tài)，當(dāng)時(shí)取消timer同時(shí)將trig point恢復(fù)到85度。
關(guān)于 set_point部分的設(shè)定。ss-data.c中，關(guān)于temp threshold的深入。
下面討論高溫threshold
1：首先上層set_point（默認(rèn)85度）會(huì)寫(xiě)入/sys/class/thermal/thermal_zoneX/trip_point_0_temp。
2：當(dāng)sensor溫度達(dá)到85度后，觸發(fā)中斷通知上層與kernel mitigation
流程：tsens_isr->thermal_sensor_trip->thermal_sensor_trip->__update_sensor_thresholds???
由于85度，并沒(méi)有達(dá)到kernel mitigation與cpu hotplug的95度thresthold，那里這里的pos->notify()并不會(huì)跑進(jìn)mitigation與hotplug。
在__update_sensor_thresholds（）里面會(huì)將trip_point_0_temp由85度改為95度。這時(shí)中斷不再觸發(fā)，需要等到高溫95度觸發(fā)中斷。此時(shí)thermal-engine已經(jīng)在運(yùn)轉(zhuǎn)，超過(guò)85度已經(jīng)啟用cpu降頻。很快cpu溫度會(huì)從85度以上降低下來(lái)，假如降低到84度時(shí)，那么trip_point_0_temp是不是應(yīng)該重新置為85度呢？
下面貼出重新設(shè)回threshold的方法：
在ss_algorithm.c的handle_thresh_sig（）里面會(huì)去處理同時(shí)重新設(shè)定cpu可以跑到最高freq。
假如機(jī)器溫度實(shí)在是太高超過(guò)了95度，那么kernel mitigation與cpu hotplug將會(huì)運(yùn)轉(zhuǎn)起來(lái)。
利用msm_thermal.c提供的cpus_offlined接口關(guān)閉指定的cpu。
禁用cpu3 :
?????? echo 8 > ?sys/module/msm_thermal/core_control/cpus_offlined ??
CPU升溫：
?????? cat /dev/zero > /dev/null &? ? 執(zhí)行30次
打開(kāi)feature:
?????? stop thermal-engine?
?????? thermal-engine --debug &?
?????? logcat -v time -s ThermalEngine?
logcat現(xiàn)場(chǎng)分析，第一段logcat分析：
下面的由于溫度達(dá)到了pop_mem的70度，那么algo_monitor就運(yùn)作起來(lái)了，
03-07 22:01:44.619 D/ThermalEngine( 2110): tsens_uevent: tsens_tz_sensor2
03-07 22:01:44.619 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Reading 70000 .
03-07 22:01:44.619 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:01:44.619 D/ThermalEngine( 2110): thresh_notify: SS Id SS-POPMEM, Update recieved pop_mem 70000 ?//底層中斷激活
03-07 22:01:44.619 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(0), Hi(0) 2147483647, Lo(0) -2147483648, Interval(0) 2147483647
03-07 22:01:44.619 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Wait for client request.
03-07 22:01:44.619 D/ThermalEngine( 2110): algo_monitor: Thresh EVT
03-07 22:01:44.619 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC ?//pop_mem 70度
03-07 22:01:44.619 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM, Read pop_mem 70000mC
03-07 22:01:44.619 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM Transition State 2
03-07 22:01:44.619 D/ThermalEngine( 2110): sensors_manager_set_thresh_lvl: tsens_tz_sensor2 Hi(0) 0, Lo(1) 45000, Interval(0) 0
03-07 22:01:44.619 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(1), Hi(0) 2147483647, Lo(1) 45000, Interval(0) 2147483647 ? ?//設(shè)置低溫point45度觸發(fā)中斷
03-07 22:01:44.619 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_0_type)
03-07 22:01:44.619 D/ThermalEngine( 2110): TSENS threshold at 0 enabled: 0
03-07 22:01:44.619 D/ThermalEngine( 2110): Setting up TSENS thresholds low: 45
03-07 22:01:44.619 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_1_type)
03-07 22:01:44.619 D/ThermalEngine( 2110): TSENS threshold at 1 enabled: 1 //寫(xiě)入低有效 45度觸發(fā)
//上面的中斷觸發(fā)激活了timer
03-07 22:01:44.619 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:01:44.619 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:01:44.619 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Sensor wait.
03-07 22:01:45.619 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:01:45.619 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:69000 mC
03-07 22:01:45.619 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 69000mC, Err 1000mC, SampleCnt 1//此時(shí)讀取到的69度
03-07 22:01:45.619 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 1000mC, E1 0mC
03-07 22:01:45.619 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:69000 mC
03-07 22:01:45.619 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM, Read pop_mem 69000mC
03-07 22:01:45.619 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM Transition State 3 ?//stop采樣，重新設(shè)置70度高有效
03-07 22:01:45.619 D/ThermalEngine( 2110): device_clnt_cancel_request: DEV cpu
03-07 22:01:45.619 D/ThermalEngine( 2110): sensors_manager_set_thresh_lvl: tsens_tz_sensor2 Hi(1) 70000, Lo(0) 0, Interval(0) 0
03-07 22:01:45.619 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(1), Hi(1) 70000, Lo(0) -2147483648, Interval(0) 2147483647
03-07 22:01:45.619 D/ThermalEngine( 2110): Setting up TSENS thresholds high: 70
03-07 22:01:45.619 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_0_type)
03-07 22:01:45.619 D/ThermalEngine( 2110): TSENS threshold at 0 enabled: 1
03-07 22:01:45.619 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_1_type)
03-07 22:01:45.619 D/ThermalEngine( 2110): TSENS threshold at 1 enabled: 0
//溫度在70以下取消timer
03-07 22:01:45.619 D/ThermalEngine( 2110): settimer: Start timer 0.000(sec)
//下一輪的中斷激活
03-07 22:01:45.619 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:01:49.629 D/ThermalEngine( 2110): tsens_uevent: tsens_tz_sensor2
03-07 22:01:49.629 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Reading 70000 .
03-07 22:01:49.629 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:01:49.629 D/ThermalEngine( 2110): thresh_notify: SS Id SS-POPMEM, Update recieved pop_mem 70000
03-07 22:01:49.629 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(0), Hi(0) 2147483647, Lo(0) -2147483648, Interval(0) 2147483647
03-07 22:01:49.629 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Wait for client request.
03-07 22:01:49.629 D/ThermalEngine( 2110): algo_monitor: Thresh EVT
03-07 22:01:49.629 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:01:49.629 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM, Read pop_mem 70000mC
03-07 22:01:49.629 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM Transition State 2
03-07 22:01:49.629 D/ThermalEngine( 2110): sensors_manager_set_thresh_lvl: tsens_tz_sensor2 Hi(0) 0, Lo(1) 45000, Interval(0) 0
03-07 22:01:49.629 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(1), Hi(0) 2147483647, Lo(1) 45000, Interval(0) 2147483647
03-07 22:01:49.629 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_0_type)
03-07 22:01:49.629 D/ThermalEngine( 2110): TSENS threshold at 0 enabled: 0
03-07 22:01:49.629 D/ThermalEngine( 2110): Setting up TSENS thresholds low: 45
03-07 22:01:49.629 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_1_type)
03-07 22:01:49.629 D/ThermalEngine( 2110): TSENS threshold at 1 enabled: 1
//設(shè)定1s timer
03-07 22:01:49.629 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:01:49.629 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:01:49.629 D/ThermalEngine( 2110): sensor_monitor: tsens_tz_sensor2 Sensor wait.
03-07 22:01:50.629 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:01:50.629 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:01:50.629 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 70000mC, Err 0mC, SampleCnt 1
03-07 22:01:50.629 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 0mC, E1 0mC
第二段logcat分析：
采樣到71度啟動(dòng)降頻,這時(shí)底層會(huì)設(shè)置高位point為95度
03-07 22:04:15.669 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:04:15.669 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:04:16.669 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:04:16.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:71000 mC
03-07 22:04:16.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 71000mC, Err -1000mC, SampleCnt 1
03-07 22:04:16.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 -1000mC, E1 0mC
03-07 22:04:16.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu, op_value 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu0, op_value 1152000
03-07 22:04:16.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[0] to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): CPU[0] frequency limited to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu1, op_value 1152000
03-07 22:04:16.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[1] to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): CPU[1] frequency limited to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu2, op_value 1152000
03-07 22:04:16.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[2] to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): CPU[2] frequency limited to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu3, op_value 1152000
03-07 22:04:16.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[3] to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110): CPU[3] frequency limited to 1152000
03-07 22:04:16.669 D/ThermalEngine( 2110):?increase_mitigation_lvl: SS Id SS-POPMEM, Device cpu, Req. Freq 1152000Khz, Applied freq 1152000kHz, TC delay 1
03-07 22:04:16.669 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
下一輪timer:
剛才降頻了，這次采樣到溫度恢復(fù)到了70度，那么cpu恢復(fù)最大值，同時(shí)設(shè)置低有效45度。
03-07 22:04:16.669 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:04:17.669 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:04:17.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:04:17.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 70000mC, Err 0mC, SampleCnt 1
03-07 22:04:17.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 0mC, E1 -1000mC
03-07 22:04:17.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu, op_value 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu0, op_value 1209600
03-07 22:04:17.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[0] to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): CPU[0] frequency limited to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu1, op_value 1209600
03-07 22:04:17.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[1] to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): CPU[1] frequency limited to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu2, op_value 1209600
03-07 22:04:17.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[2] to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): CPU[2] frequency limited to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): devices_manager_set_op_value: DEV cpu3, op_value 1209600
03-07 22:04:17.669 I/ThermalEngine( 2110): ACTION: CPU - Setting CPU[3] to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110): CPU[3] frequency limited to 1209600
03-07 22:04:17.669 D/ThermalEngine( 2110):?decrease_mitigation_lvl: SS Id SS-POPMEM, Device cpu, Req. Freq 1209600Khz, Applied freq 1209600kHz, TC delay 0
03-07 22:04:17.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:04:17.669 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM, Read pop_mem 70000mC
03-07 22:04:17.669 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM Transition State 2
03-07 22:04:17.669 D/ThermalEngine( 2110): sensors_manager_set_thresh_lvl: tsens_tz_sensor2 Hi(0) 0, Lo(1) 45000, Interval(0) 0
03-07 22:04:17.669 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(1), Hi(0) 2147483647, Lo(1) 45000, Interval(0) 2147483647
03-07 22:04:17.669 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_0_type)
03-07 22:04:17.669 D/ThermalEngine( 2110): TSENS threshold at 0 enabled: 0
03-07 22:04:17.669 D/ThermalEngine( 2110): Setting up TSENS thresholds low: 45
03-07 22:04:17.669 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_1_type)
03-07 22:04:17.669 D/ThermalEngine( 2110): TSENS threshold at 1 enabled: 1
03-07 22:04:17.669 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:04:17.669 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:04:18.669 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:04:18.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:04:18.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 70000mC, Err 0mC, SampleCnt 1
03-07 22:04:18.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 0mC, E1 0mC
03-07 22:04:18.669 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:04:18.669 D/ThermalEngine( 2110): algo_monitor: Wait for EV
03-07 22:04:19.669 D/ThermalEngine( 2110): algo_monitor: Timer EVT
03-07 22:04:19.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:04:19.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM Read pop_mem 70000mC, Err 0mC, SampleCnt 1
03-07 22:04:19.669 D/ThermalEngine( 2110): handle_timer_sig: SS Id SS-POPMEM, E0 0mC, E1 0mC
03-07 22:04:19.669 I/ThermalEngine( 2110): Sensor:tsens_tz_sensor2:70000 mC
03-07 22:04:19.669 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM, Read pop_mem 70000mC
03-07 22:04:19.669 D/ThermalEngine( 2110): handle_thresh_sig: SS Id SS-POPMEM Transition State 2
03-07 22:04:19.669 D/ThermalEngine( 2110): sensors_manager_set_thresh_lvl: tsens_tz_sensor2 Hi(0) 0, Lo(1) 45000, Interval(0) 0
03-07 22:04:19.669 D/ThermalEngine( 2110): update_active_thresh: tsens_tz_sensor2 Active(1), Hi(0) 2147483647, Lo(1) 45000, Interval(0) 2147483647
03-07 22:04:19.669 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_0_type)
03-07 22:04:19.669 D/ThermalEngine( 2110): TSENS threshold at 0 enabled: 0
03-07 22:04:19.669 D/ThermalEngine( 2110): Setting up TSENS thresholds low: 45
03-07 22:04:19.669 D/ThermalEngine( 2110): enable_threshold: tsens_tz_sensor2 (/sys/devices/virtual/thermal/thermal_zone3/trip_point_1_type)
03-07 22:04:19.669 D/ThermalEngine( 2110): TSENS threshold at 1 enabled: 1
03-07 22:04:19.669 D/ThermalEngine( 2110): settimer: Start timer 1.000(sec)
03-07 22:04:19.669 D/ThermalEngine( 2110): algo_monitor: Wait for EV
總結(jié)：
??????? 以上就是高通的thermal機(jī)制的介紹，它可以在溫度過(guò)高時(shí)，通過(guò)軟件對(duì)多核CPU的降頻和關(guān)閉，達(dá)到降低溫度一個(gè)目的。希望通過(guò)本文對(duì)大家能有一定幫助，對(duì)高通的thermal機(jī)制有個(gè)大概的了解，并對(duì)自己的產(chǎn)品做一個(gè)熱量控制調(diào)試。
總結(jié)
以上是生活随笔為你收集整理的Qualcomm thermal的介绍的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問(wèn)題。
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