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| author | Libin Yang <libin.yang@intel.com> | 2017-01-12 16:04:54 +0800 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-01-12 10:06:47 +0100 |
| commit | dd48e8ed3bfdee879ce60508230bed7fb2ca5fa8 (patch) | |
| tree | 443ccc154cce3ca46fd09cfa37366b6eabf0e433 /Documentation/sound/hd-audio | |
| parent | 9152085defb6426ce8f9989ca27e4450daefbd89 (diff) | |
| download | linux-stable-dd48e8ed3bfdee879ce60508230bed7fb2ca5fa8.tar.gz linux-stable-dd48e8ed3bfdee879ce60508230bed7fb2ca5fa8.tar.bz2 linux-stable-dd48e8ed3bfdee879ce60508230bed7fb2ca5fa8.zip | |
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
Diffstat (limited to 'Documentation/sound/hd-audio')
| -rw-r--r-- | Documentation/sound/hd-audio/dp-mst.rst | 17 |
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 ==== |