kernel 通过 drm 向 hdmi 设备进行显示，资料可以参考: https://zhuanlan.zhihu.com/p/59784377 https://zhuanlan.zhihu.com/p/60504398 https://dri.freedesktop.org/docs/drm/gpu/drm-kms.html?highlight=writeback https://www.kernel.org/doc/html/v4.17/gpu/drm-kms.html https://blog.csdn.net/u014674293/article/details/105774238 https://www.cnblogs.com/mao0504/p/5619107.html https://blog.csdn.net/hexiaolong2009/article/details/89810355
调整 hdmi 分辨率: https://forum.khadas.com/t/hdmi-resolutions-testing/618/6
