From mboxrd@z Thu Jan 1 00:00:00 1970 From: libin.yang@linux.intel.com Subject: [RFC PATCH v3 3/3] ALSA: Documentation about HDA DP MST pin init and connection Date: Thu, 13 Oct 2016 15:49:37 +0800 Message-ID: <1476344977-147193-4-git-send-email-libin.yang@linux.intel.com> References: <1476344977-147193-1-git-send-email-libin.yang@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by alsa0.perex.cz (Postfix) with ESMTP id 9AAC8265A98 for ; Thu, 13 Oct 2016 09:54:50 +0200 (CEST) In-Reply-To: <1476344977-147193-1-git-send-email-libin.yang@linux.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: alsa-devel@alsa-project.org, tiwai@suse.de Cc: libin.yang@intel.com, mengdong.lin@intel.com, Libin Yang List-Id: alsa-devel@alsa-project.org From: Libin Yang Add the documentation about HD-audio DP MST: 1. pin initialization 2. device entry connection list Signed-off-by: Libin Yang --- Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt index 82744ac..0c5ea7d 100644 --- a/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt +++ b/Documentation/sound/alsa/HD-Audio-DP-MST-audio.txt @@ -15,6 +15,23 @@ 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 ==== -- 1.9.1