https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt
https:/ /git.kernel. org/cgit/ linux/kernel/ git/tiwai/ sound.git/ tree/Documentat ion/sound/ alsa/HD- Audio-DP- MST-audio. txt