Kernel Exception导致手机重启案例分析
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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
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