From: Libin Yang <libin.yang@xxxxxxxxxxxxxxx> Add the documentation about HD-audio DP MST: 1. pin initialization 2. device entry connection list Signed-off-by: Libin Yang <libin.yang@xxxxxxxxxxxxxxx> --- Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt index 82744ac..0c5ea7d 100644 --- a/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt +++ b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt @@ -15,6 +15,23 @@ PCM === To be added +Pin Initialization +================== +Each pin may have several device entries (virtual pins). On Intel platform, +the device entries number is dynamically changed. If DP MST hub is connected, +it is in DP MST mode, and the device entries number is 3. Otherwise, the +device entries number is 1. + +To simplify the implementation, all the device entries will be initialized +when bootup no matter whether it is in DP MST mode or not. + +Connection list +=============== +DP MST reuses connection list code. The code can be reused because +device entries on the same pin have the same connection list. + +This means DP MST gets the device entry connection list without the +device entry setting. Jack ==== -- 1.9.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
