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经典好文推荐，通过阅读本文，您将收获以下知识点:

一、高温触发 Kernel Exception 重启问题
二、解决方案
三、提高电池温度方案

一、 高温触发 Kernel Exception 重启问题

手机 电池温度 默认60度以上高温会触发手机安全机制，让手机管家或者重启。

由温度异常导致手机重启的部分 Log 如下：

高温情况下，Kernel Exception引起的重启问题

二、解决方案

此问题 需要驱动同事修改底层battery.c 文件中的一个地址，不让其写为dead，就不会重启。或者提高电池温度参数。

三、提高电池温度方案

提高电池温度的方案如下：

1.修改mtk_battery_table.h

/alps/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6739/include/mach/mtk_battery_table.h

* ============================================================

  */

+//#define SPROCOMM_NTC //wang add

+#ifdef SPROCOMM_NTC

+#define NTC_COMP_RES 42

+#endif

+

 /* Qmax for battery  */

 #define Q_MAX_L_CURRENT 0

 #define Q_MAX_H_CURRENT 10000

@@ [-111,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6739/include/mach/mtk_battery_table.h;h=7cb7b5e7e735a1907b941a6df5755c582ffca0ac;hb=7cb7b5e7e735a1907b941a6df5755c582ffca0ac#l111) [+116,8](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6739/include/mach/mtk_battery_table.h;h=76ef73904571e7abf677cf9b73783b52131c467a;hb=76ef73904571e7abf677cf9b73783b52131c467a#l116) @@ int g_QMAX_SYS_VOL_T4[TOTAL_BATTERY_NUMBER] = {36000, 36010, 36020, 36030};

 #define BIF_NTC_R 16000

 #if (BAT_NTC_10 == 1)

-struct FUELGAUGE_TEMPERATURE Fg_Temperature_Table[21] = {

+#define NTC_NUM 25 //wang add 20180528

+struct FUELGAUGE_TEMPERATURE Fg_Temperature_Table[NTC_NUM] = {

                {-40, 195652},

                {-35, 148171},

                {-30, 113347},

@@ [-132,12](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6739/include/mach/mtk_battery_table.h;h=7cb7b5e7e735a1907b941a6df5755c582ffca0ac;hb=7cb7b5e7e735a1907b941a6df5755c582ffca0ac#l132) [+138,17](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/include/mt-plat/mt6739/include/mach/mtk_battery_table.h;h=76ef73904571e7abf677cf9b73783b52131c467a;hb=76ef73904571e7abf677cf9b73783b52131c467a#l138) @@ struct FUELGAUGE_TEMPERATURE Fg_Temperature_Table[21] = {

                {45, 4917},

                {50, 4161},

                {55, 3535},

-               {60, 3014}

+               {60, 3014},

+               {65, 2586},

+               {70, 2228},

+               {75, 1925},

+               {80, 1669}

 };

 #endif

 #if (BAT_NTC_47 == 1)

-struct FUELGAUGE_TEMPERATURE Fg_Temperature_Table[21] = {

+#define NTC_NUM 21 //wang add 20180528

+struct FUELGAUGE_TEMPERATURE Fg_Temperature_Table[NTC_NUM] = {

                {-40, 1747920},

                {-35, 1245428},

                {-30, 898485},

2. 修改mtk_ts_battery.c

/alps/kernel-4.4/drivers/misc/mediatek/thermal/common/thermal_zones/mtk_ts_battery.c

@@ [-134,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/thermal/common/thermal_zones/mtk_ts_battery.c;h=f807c7272f610a9e61307eaebe0057ee0f157490;hb=f807c7272f610a9e61307eaebe0057ee0f157490#l134) [+134,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/thermal/common/thermal_zones/mtk_ts_battery.c;h=e201c1fc84ba09e04f8d53a5ca11993848df1feb;hb=e201c1fc84ba09e04f8d53a5ca11993848df1feb#l134) @@ static int bat_temp = 21234;

 /* static int battery_write_flag=0; */

-#define mtktsbattery_TEMP_CRIT 60000   /* 60.000 degree Celsius */

+#define mtktsbattery_TEMP_CRIT 80000   /* 60.000 degree Celsius */ //wang add 20180528

 #define mtktsbattery_dprintk(fmt, args...)   \

 do {                                    \

@@ [-455,8](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/thermal/common/thermal_zones/mtk_ts_battery.c;h=f807c7272f610a9e61307eaebe0057ee0f157490;hb=f807c7272f610a9e61307eaebe0057ee0f157490#l455) [+455,8](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/misc/mediatek/thermal/common/thermal_zones/mtk_ts_battery.c;h=e201c1fc84ba09e04f8d53a5ca11993848df1feb;hb=e201c1fc84ba09e04f8d53a5ca11993848df1feb#l455) @@ static int tsbat_sysrst_set_cur_state(struct thermal_cooling_device *cdev, unsig

                pr_debug("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");

                pr_debug("*****************************************");

                pr_debug("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");

-

-               *(unsigned int *)0x0 = 0xdead;  /* To trigger data abort to reset the system for thermal protection. */

+               //wang add 20180528

+               //*(unsigned int *)0x0 = 0xdead;        /* To trigger data abort to reset the system for thermal protection. */

        }

        return 0;

 }

3. 修改 mtk_battery.c

alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c

@@ [-2041,15](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=424147210393fd33fb205b40414683f5549b3cc2;hb=424147210393fd33fb205b40414683f5549b3cc2#l2041) [+2041,15](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=97a739dc0bbddd02b32c85c1c99da6006e81e746;hb=97a739dc0bbddd02b32c85c1c99da6006e81e746#l2041) @@ unsigned int TempConverBattThermistor(int temp)

        int i;

        unsigned int TBatt_R_Value = 0xffff;

-       if (temp >= Fg_Temperature_Table[20].BatteryTemp) {

-               TBatt_R_Value = Fg_Temperature_Table[20].TemperatureR;

+       if (temp >= Fg_Temperature_Table[NTC_NUM - 1].BatteryTemp) {

+               TBatt_R_Value = Fg_Temperature_Table[NTC_NUM - 1].TemperatureR;

        } else if (temp <= Fg_Temperature_Table[0].BatteryTemp) {

                TBatt_R_Value = Fg_Temperature_Table[0].TemperatureR;

        } else {

                RES1 = Fg_Temperature_Table[0].TemperatureR;

                TMP1 = Fg_Temperature_Table[0].BatteryTemp;

-               for (i = 0; i <= 20; i++) {

+               for (i = 0; i < NTC_NUM; i++) {

                        if (temp <= Fg_Temperature_Table[i].BatteryTemp) {

                                RES2 = Fg_Temperature_Table[i].TemperatureR;

                                TMP2 = Fg_Temperature_Table[i].BatteryTemp;

@@ [-2078,13](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=424147210393fd33fb205b40414683f5549b3cc2;hb=424147210393fd33fb205b40414683f5549b3cc2#l2078) [+2078,13](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=97a739dc0bbddd02b32c85c1c99da6006e81e746;hb=97a739dc0bbddd02b32c85c1c99da6006e81e746#l2078) @@ int BattThermistorConverTemp(int Res)

        if (Res >= Fg_Temperature_Table[0].TemperatureR) {

                TBatt_Value = -40;

-       } else if (Res <= Fg_Temperature_Table[20].TemperatureR) {

-               TBatt_Value = 60;

+       } else if (Res <= Fg_Temperature_Table[NTC_NUM - 1].TemperatureR) {

+               TBatt_Value = 80;

        } else {

                RES1 = Fg_Temperature_Table[0].TemperatureR;

                TMP1 = Fg_Temperature_Table[0].BatteryTemp;

-               for (i = 0; i <= 20; i++) {

+               for (i = 0; i < (NTC_NUM - 1); i++) {

                        if (Res >= Fg_Temperature_Table[i].TemperatureR) {

                                RES2 = Fg_Temperature_Table[i].TemperatureR;

                                TMP2 = Fg_Temperature_Table[i].BatteryTemp;

@@ [-2098,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=424147210393fd33fb205b40414683f5549b3cc2;hb=424147210393fd33fb205b40414683f5549b3cc2#l2098) [+2098,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=97a739dc0bbddd02b32c85c1c99da6006e81e746;hb=97a739dc0bbddd02b32c85c1c99da6006e81e746#l2098) @@ int BattThermistorConverTemp(int Res)

                TBatt_Value = (((Res - RES2) * TMP1) + ((RES1 - Res) * TMP2)) / (RES1 - RES2);

        }

-       bm_trace("[BattThermistorConverTemp] %d %d %d %d %d %d\n", RES1, RES2, Res, TMP1, TMP2, TBatt_Value);

+       bm_trace("[BattThermistorConverTemp] %d %d %d %d %d %d, wwwwwNTC_NUM = %d\n", RES1, RES2, Res, TMP1, TMP2, TBatt_Value, NTC_NUM);

        return TBatt_Value;

 }

@@ [-2334,8](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=424147210393fd33fb205b40414683f5549b3cc2;hb=424147210393fd33fb205b40414683f5549b3cc2#l2334) [+2334,8](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery.c;h=97a739dc0bbddd02b32c85c1c99da6006e81e746;hb=97a739dc0bbddd02b32c85c1c99da6006e81e746#l2334) @@ int force_get_tbat(bool update)

        bat_temperature_val = force_get_tbat_internal(update);

-       while (counts < 5 && bat_temperature_val >= 60) {

-               bm_err("[force_get_tbat]over60 count=%d, bat_temp=%d\n", counts, bat_temperature_val);

+       while (counts < 5 && bat_temperature_val >= 80) {//wang submit 20180524

+               bm_err("[force_get_tbat]over80 count=%d, bat_temp=%d\n", counts, bat_temperature_val);

                bat_temperature_val = force_get_tbat_internal(true);

                counts++;

        }

4.修改 mtk_battery_internal.h

alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery_internal.h

@@ [-34,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery_internal.h;h=6c2293cbfad5a14e479c095779d82e88d1032bcb;hb=6c2293cbfad5a14e479c095779d82e88d1032bcb#l34) [+34,7](http://192.168.11.104/gitweb/?p=alps-mp-o1.mp1-V1.git;a=blob;f=alps/kernel-4.4/drivers/power/mediatek/battery/mtk_battery_internal.h;h=304fc84470f8bdfdece2439cc5376b15c0b4dfba;hb=304fc84470f8bdfdece2439cc5376b15c0b4dfba#l34) @@

 #define SHUTDOWN_TIME 40

 #define AVGVBAT_ARRAY_SIZE 30

 #define INIT_VOLTAGE 3450

-#define BATTERY_SHUTDOWN_TEMPERATURE 60

+#define BATTERY_SHUTDOWN_TEMPERATURE 80

 /* ============================================================ */

 /* typedef and Struct*/

参考文献：

【腾讯文档】Android Framework 知识库
https://docs.qq.com/doc/DSXBmSG9VbEROUXF5

友情推荐：

Android 开发干货集锦

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