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Commit dd48e8ed authored by Libin Yang's avatar Libin Yang Committed by Daniel Vetter
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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: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarLibin Yang <libin.yang@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1484208294-8637-4-git-send-email-libin.yang@intel.com
parent 9152085d

Documentation/sound/hd-audio/dp-mst.rst

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Original line number Diff line number Diff line
@@ -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

====