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authorLibin Yang <libin.yang@intel.com>2017-01-12 16:04:54 +0800
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-01-12 10:06:47 +0100
commitdd48e8ed3bfdee879ce60508230bed7fb2ca5fa8 (patch)
tree443ccc154cce3ca46fd09cfa37366b6eabf0e433
parent9152085defb6426ce8f9989ca27e4450daefbd89 (diff)
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
-rw-r--r--Documentation/sound/hd-audio/dp-mst.rst17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/sound/hd-audio/dp-mst.rst b/Documentation/sound/hd-audio/dp-mst.rst
index 58b72437e6c3..1617459e332f 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
====