RK3568 android13 user模式下HDMI没有声音

问题描述：

在android13,RK3568平台上。userdebug模式下，HDMI有声音。user模式没有声音。

log分析：

06-04 07:53:15.706   484   504 E ExtconStateObserver: Could not get the alias name.
06-04 07:53:15.706   484   504 E ExtconStateObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon4/device/uevent: open failed: EACCES (Permission denied)

 可以看到是没有权限去打开文件。

通过log提示，使用ADB查看/sys/class/extcon/extcon4 的信息。找到extcon4是属于fe0a0000.hdmi下面的。

QP1100:/sys/class/extcon/extcon4 # ls
cable.0  device  name  power  state  subsystem  uevent
QP1100:/sys/class/extcon/extcon4 # cat name
fe0a0000.hdmi
QP1100:/sys/class/extcon/extcon4 #

在 device/rockchip/common/sepolicy/vendor/genfs_contexts 下面添加如下权限。

genfscon sysfs /devices/platform/fe0a0000.hdmi/extcon/extcon4                   u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe0a0000.hdmi/uevent                           u:object_r:sysfs_extcon:s0

最后编译成user版本，测试OK。

 

在调试HDMI user模式下，还有其他类似的权限问题，也一起解决了。如下：

06-04 07:53:15.724   484   504 E ExtconStateObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon0/device/uevent: open failed: EACCES (Permission denied)
06-04 07:53:15.727   484   504 E ExtconStateObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon1/device/uevent: open failed: EACCES (Permission denied)
06-04 07:53:26.838   484   484 W ExtconUEventObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon3/cable.0/name: open failed: EACCES (Permission denied)
06-04 07:53:30.874   484   484 E ExtconStateObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon2/device/uevent: open failed: EACCES (Permission denied)
06-04 07:53:30.877   484   484 E ExtconStateObserver: java.io.FileNotFoundException: /sys/class/extcon/extcon5/device/uevent: open failed: EACCES (Permission denied)

通过adb 查找对应信息

QP1100:/sys/class/extcon # ls
extcon0  extcon1  extcon2  extcon3  extcon4  extcon5
QP1100:/sys/class/extcon # cat extcon0/name
fe8a0000.usb2-phy
QP1100:/sys/class/extcon # cat extcon1/name
fe8b0000.usb2-phy
QP1100:/sys/class/extcon # cat extcon2/name
rk809-sound
QP1100:/sys/class/extcon # cat extcon3/name
fe0c0000.edp
QP1100:/sys/class/extcon # cat extcon5/name
rk-headset
QP1100:/sys/class/extcon #

 

添加权限：

genfscon sysfs /devices/platform/fe8a0000.usb2-phy/extcon/extcon0                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe8b0000.usb2-phy/extcon/extcon1                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/rk809-sound/extcon/extcon2                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe0c0000.edp/extcon/extcon3                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/rk-headset/extcon/extcon5                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe8a0000.usb2-phy/uevent                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe8b0000.usb2-phy/uevent                           u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/rk809-sound/uevent                          u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/fe0c0000.edp/uevent                          u:object_r:sysfs_extcon:s0
genfscon sysfs /devices/platform/rk-headset/uevent                           u:object_r:sysfs_extcon:s0