VS-RK3XXX 主板中设置android 7.1系统中视频输出4K配置说明：

hardware/rockchip/libgralloc
/Android.mk

GRALLOC_INIT_AFBC?=1

USE_AFBC_LAYER = 0 找到这个设置为0
ifeq ($(strip $(TARGET_BOARD_PLATFORM)),rk3399)
USE_AFBC_LAYER = 0
ifeq ($(strip $(TARGET_BOARD_PLATFORM_PRODUCT)),box)
USE_AFBC_LAYER = 0
endif
endif

驱动文件主要是dts的配置，
kernel\arch\arm64\boot\dts\rockchip


&route_hdmi {
    status = "okay";
    connect = <&vopl_out_hdmi>;
};
&route_mipi {
    status = "okay";
};
HDMI应该是connect = <&vopb_out_hdmi>;
MIPI应该是connect = <&vopl_out_hdmi>;
所以改成
&route_hdmi {
connect = <&vopb_out_hdmi>;
status = "okay";
};
&route_mipi {
connect = <&vopl_out_mipi>;
status = "okay";
};