概念
Thermal 俗称热控制系统，其功能是通过 temperature sensor 测量当前 CPU、GPU 等设备的温度值，然后根据此温度值，影响 CPU、GPU 等设备的调频策略，对 CPU、GPU 等设备的最大频率进行限制， 最终实现对 CPU、GPU 等设备温度的闭环控制，避免 SOC 温度过高。
IPA(Intelligent Power allocator) 温控策略：引入 PID 控制，根据系统温度动态分配 power给各个设备，并将 power 转化为频率限制
驱动配置
board.dts
ths: thermal_sensor{
compatible = "allwinner,sun50iw10p1-ths";
reg = <0x0 0x05070400 0x0 0x400>;
clocks = <&clk_ths>;
clock-names = "bus";
nvmem-cells = <&ths_calib>;
nvmem-cell-names = "calibration";
#thermal-sensor-cells = <1>;
};
thermal-zones {
cpu_thermal_zone {
polling-delay-passive = <500>; // 温度超过阈值，轮询温度周期(ms)
polling-delay = <1000>; // 温度未超过阈值，轮询温度周期(ms)
thermal-sensors = <&ths 0>;
sustainable-power = <1200>; // 温度达到预设温度最大值，系统可分配的最大power
k_po = <66>;
k_pu = <132>;
k_i = <0>;
cpu_trips: trips {
cpu_threshold: trip-point@0 {
temperature = <70000>; // 代表系统温控在70度左右开启
type = "passive";
hysteresis = <0>;
};
cpu_target: trip-point@1 {
temperature = <90000>; // 代表系统最高温度是80度左右
type = "passive";
hysteresis = <0>;
};
cpu_crit: cpu_crit@0 {
temperature = <110000>; // 代表系统到达110度就会过温关机
type = "critical";
hysteresis = <0>;
};
};
cooling-maps {
map0 {
trip = <&cpu_target>;
cooling-device = <&cpu0
THERMAL_NO_LIMIT
THERMAL_NO_LIMIT>;
contribution = <1024>;
};
/* map1{
trip = <&cpu_target>;
cooling-device = <&gpu
THERMAL_NO_LIMIT
THERMAL_NO_LIMIT>;
contribution = <1024>;
}; */
};
};
gpu_thermal_zone{
polling-delay-passive = <500>;
polling-delay = <1000>;
thermal-sensors = <&ths 1>;
sustainable-power = <1100>;
};
ddr_thermal_zone{
polling-delay-passive = <0>;
polling-delay = <0>;
thermal-sensors = <&ths 2>;
};
};
查看温度
方法1
ceres-c3:/ $ cat sys/class/thermal/thermal_zone0/type
cpu_thermal_zone
ceres-c3:/ $ cat sys/class/thermal/thermal_zone0/temp
41299
ceres-c3:/ $ cat sys/class/thermal/thermal_zone1/type
gpu_thermal_zone
ceres-c3:/ $ cat sys/class/thermal/thermal_zone1/temp
42907
ceres-c3:/ $ cat sys/class/thermal/thermal_zone2/type
ddr_thermal_zone
ceres-c3:/ $ cat sys/class/thermal/thermal_zone2/temp
43443
方法2
130|ceres-c3:/ $ cpu_monitor -s 1000
------------------------- CPU[x]<Freq:MHZ>-<Usage:%>-------------------------
CPU0 CPU1 CPU2 CPU3 Temp GPU GTemp DDR Times
| 0 32%| | 0 10%| | 0 13%| | 0 6%| 41768 504 42907 0 0
| 0 3%| | 0 3%| | 0 4%| | 0 2%| 42036 504 43041 0 1
| 0 4%| | 0 5%| | 0 3%| | 0 7%| 41701 504 42773 0 2
| 0 7%| | 0 4%| | 0 6%| | 0 10%| 41768 504 42572 0 3
| 0 1%| | 0 0%| | 0 0%| | 0 0%| 41433 504 42572 0 4
| 0 4%| | 0 2%| | 0 3%| | 0 0%| 41165 504 42639 0 5
| 0 0%| | 0 0%| | 0 1%| | 0 0%| 41031 504 42371 0 6
模拟温度
设置模拟温度
echo 80000 > /sys/class/thermal/thermal_zone0/emul_temp
关闭模拟温度
echo 0 > /sys/class/thermal/thermal_zone0/emul_temp
关闭温控
echo disabled > /sys/class/thermal/thermal_zone0/mode
