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ALSA: Documentation about HDA DP MST pin init and connection 

Add the documentation about HD-audio DP MST:
1. pin initialization
2. device entry connection list

Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1484208294-8637-4-git-send-email-libin.yang@intel.com
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Libin Yang 2017-01-12 16:04:54 +08:00 committed by Daniel Vetter
parent 9152085def
commit dd48e8ed3b
1 changed files with 17 additions and 0 deletions
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17
Documentation/sound/hd-audio/dp-mst.rst
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@ -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
====