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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@ -19,6 +19,23 @@ PCM
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To be added
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Pin Initialization
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==================
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Each pin may have several device entries (virtual pins). On Intel platform,
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the device entries number is dynamically changed. If DP MST hub is connected,
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it is in DP MST mode, and the device entries number is 3. Otherwise, the
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device entries number is 1.
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To simplify the implementation, all the device entries will be initialized
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when bootup no matter whether it is in DP MST mode or not.
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Connection list
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===============
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DP MST reuses connection list code. The code can be reused because
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device entries on the same pin have the same connection list.
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This means DP MST gets the device entry connection list without the
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device entry setting.
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Jack
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====
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