[Linux Device Driver] 系统软重启无效

解决USB充电异常重启问题

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本文探讨了系统在USB充电状态下面临的重启问题，详细分析了系统在关机状态下插入USB线无法开机，以及在充电状态下拔除USB后无法正常关机的现象。通过硬重启时间和软重启权限的调整，提供了有效的解决方案。

0. 背景

问题表现是系统，系统关机状态下插入USB线，按power设备不能开机；

同时还有一个现象，关机插入USB充电状态下，拔掉USB，系统无法shut down；

log如下：

[  153.742220] <<GTP-DBG>>[gt1x_power_switch:371]GTP power off.
[  153.811749] <<GTP-INF>>[gt1x_suspend:2253] Suspend end...
[  160.339053] healthd: battery l=58 v=3915 t=25.0 h=2 st=3 c=-896 fc=4200000 cc=0 chg=
[  160.339335] charger: [160339] shutting down
[  160.880636] charger: [160880] shutting down
[  160.880787] charger: [160880] shutting down
[  160.884019] charger: [160883] shutting down
[  161.072181] charger: [161072] shutting down
[  165.856121] charger: [165856] shutting down
[  165.857443] charger: [165857] shutting down
[  165.957515] charger: [165957] shutting down
[  166.144330] charger: [166144] shutting down
[  170.945760] charger: [170945] shutting down
[  170.946590] charger: [170946] shutting down
[  170.962459] charger: [170962] shutting down
[  171.148936] charger: [171148] shutting down
[  172.032289] healthd: battery l=58 v=3913 t=25.0 h=2 st=3 c=-896 fc=4200000 cc=0 chg=
[  172.032574] charger: [172032] shutting down
[  175.933014] charger: [175932] shutting down
[  175.934499] charger: [175934] shutting down
[  176.034951] charger: [176034] shutting down
[  176.165505] charger: [176165] shutting down
[  181.022700] charger: [181022] shutting down
[  181.031062] charger: [181031] shutting down
[  181.042673] charger: [181042] shutting down
[  181.225727] charger: [181225] shutting down
[  186.084580] charger: [186084] shutting down
[  186.090749] charger: [186090] shutting down
[  186.092509] charger: [186092] shutting down
[  186.314631] charger: [186314] shutting down
[  191.201524] charger: [191201] shutting down
[  191.202926] charger: [191202] shutting down
[  191.205084] charger: [191205] shutting down
[  191.404970] charger: [191404] shutting down

1. 硬重启

其实这个并非无法重启，只是软重启功能失效，使用硬重启长按power健10几秒，是可以重启设备的；

如下修改可以把硬重启时间从10秒修改到2秒左右；
在这里插入图片描述

注意这两个时间不是随便填的，可以检索内核文档看看；

grep -nr "qcom,s1-timer" ./kernel/msm-4.9/Documentation/

vim ./kernel/msm-4.9/Documentation/devicetree/bindings/input/qpnp-power-on.txt +166


 The below mentioned properties are required only when qcom,support-reset DT
 property is defined and is set to 1.

 - qcom,s1-timer         The debounce timer for the BARK interrupt for
                that reset source. Value is specified in ms.
                Supported values are:
                 - 0, 32, 56, 80, 128, 184, 272, 408, 608, 904
                  1352, 2048, 3072, 4480, 6720, 10256
 - qcom,s2-timer         The debounce timer for the S2 reset specified
                 in ms. On the expiry of this timer, the PMIC
                 executes the reset sequence.
                Supported values are:
                 - 0, 10, 50, 100, 250, 500, 1000, 2000
 - qcom,s2-type          The type of reset associated with this source.
                The supported resets are:
                SOFT(0), WARM(1), SHUTDOWN(4), HARD(7)

没有特殊的原因不要修改硬重启时间，原因是时间被改短了，本来开机之后，你按power键只是想唤醒下系统，结果直接重启了。当然，你要是一个项目没power健，比如用单片机控制，那当我没说-_-||。

2. 软重启解决

一般检查CAP_SYS_BOOT 权限有没有提供：

diff --git a/rootdir/etc/init.qcom.rc b/rootdir/etc/init.qcom.rc 
index f63db89..380772b 100644 
--- a/rootdir/etc/init.qcom.rc 
+++ b/rootdir/etc/init.qcom.rc 
@@ -917,6 +917,7 @@ service charger /system/bin/charger 
class charger 
user system 
group system graphics input 
+ capabilities SYS_BOOT 
seclabel u:r:charger:s0

我这个比较特殊，是人为修改出来的BUG，user 版本和debug版本走不同的init.qcom.rc ，

但是这个权限，之前的大兄弟忘了加，最终修改如下：

diff --git a/device/qcom/common/rootdir/etc/init.qcom.debug.rc 
b/device/qcom/common/rootdir/etc/init.qcom.debug.rc
--- a/device/qcom/common/rootdir/etc/init.qcom.debug.rc
+++ b/device/qcom/common/rootdir/etc/init.qcom.debug.rc
@@ -922,6 +922,7 @@ service charger /system/bin/charger
     class charger
     user system
     group system graphics input
+    capabilities SYS_BOOT
     seclabel u:r:charger:s0

 service vendor.ssr_diag /system/vendor/bin/ssr_diag
diff --git a/device/qcom/common/rootdir/etc/init.qcom.user.rc 
b/device/qcom/common/rootdir/etc/init.qcom.user.rc
--- a/device/qcom/common/rootdir/etc/init.qcom.user.rc
+++ b/device/qcom/common/rootdir/etc/init.qcom.user.rc
@@ -925,6 +925,7 @@ service charger /system/bin/charger
     class charger
     user system
     group system graphics input
+    capabilities SYS_BOOT
     seclabel u:r:charger:s0