Kernel Exception导致手机重启案例分析

和你一起终身学习，这里是程序员Android

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, unsigpr_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

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