The default setting of OTG USB3.0 is devices mode

Temporary modification method

adb shell setprop persist.usb.mode 2

Code modification method

• Android7.1/Android10

  • In the device/rockchip/CPU_TYPE/PRODUCT_TYPE/system.prop file, add the following content:

  persist.usb.mode=2

• Android11/Android12

  • In the device/rockchip/CPU_TYPE/PRODUCT_TYPE/PRODUCT_TYPE.mk file, add the following content:

  PRODUCT_PROPERTY_OVERRIDES += persist.usb.mode=otg

• Delete build.prop in the out directory

  rm out/target/product/PRODUCT_TYPE/obj/ETC/system_build_prop_intermediates/build.prop