RK3399 HDMI无显示

Chip Platform Rockchip
1

ubuntu固件。显示器无显示，已排除显示器和线的原因。
插拔HDMI线，信息如下：
[ 724.875883] dwhdmi-rockchip ff940000.hdmi: failed to get edid
[ 725.016804] dwhdmi-rockchip ff940000.hdmi: failed to get edid
[ 725.105777] rockchip-vop ff900000.vop: [drm:vop_crtc_enable] Update mode to 1280x720p0, type: 11
[ 725.116382] dwhdmi-rockchip ff940000.hdmi: PHY failed to power down
[ 734.130406] dwhdmi-rockchip ff940000.hdmi: PHY failed to power down
问题的原因是什么，怎么确定是否是硬件问题？

2

设备树要怎么配置？

3

https://blog.csdn.net/oliverj/article/details/103957723?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-2&spm=1001.2101.3001.4242