From: Libin Yang <libin.yang@xxxxxxxxx> Add the documentation about HD-audio DP MST: 1. pin initialization 2. device entry connection list Reviewed-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Libin Yang <libin.yang@xxxxxxxxx> --- Documentation/sound/hd-audio/dp-mst.rst | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/sound/hd-audio/dp-mst.rst b/Documentation/sound/hd-audio/dp-mst.rst index 58b7243..1617459 100644 --- a/Documentation/sound/hd-audio/dp-mst.rst +++ b/Documentation/sound/hd-audio/dp-mst.rst @@ -19,6 +19,23 @@ 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 ==== -- 2.7.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
