From patchwork Thu Oct 13 07:49:37 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: libin.yang@linux.intel.com X-Patchwork-Id: 9374551 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id DDE7960839 for ; Thu, 13 Oct 2016 08:56:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CEF6228816 for ; Thu, 13 Oct 2016 08:56:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C37572960F; Thu, 13 Oct 2016 08:56:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E5C7128816 for ; Thu, 13 Oct 2016 08:56:24 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id 2879D266DB8; Thu, 13 Oct 2016 10:56:23 +0200 (CEST) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 9D364266DAA; Thu, 13 Oct 2016 10:54:06 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 3F599266D0A; Thu, 13 Oct 2016 09:54:57 +0200 (CEST) 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) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga102.fm.intel.com with ESMTP; 13 Oct 2016 00:54:47 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.31,339,1473145200"; d="scan'208"; a="1064195308" Received: from younglee-grantley.sh.intel.com ([10.239.159.22]) by orsmga002.jf.intel.com with ESMTP; 13 Oct 2016 00:54:45 -0700 From: libin.yang@linux.intel.com To: alsa-devel@alsa-project.org, tiwai@suse.de Date: Thu, 13 Oct 2016 15:49:37 +0800 Message-Id: <1476344977-147193-4-git-send-email-libin.yang@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1476344977-147193-1-git-send-email-libin.yang@linux.intel.com> References: <1476344977-147193-1-git-send-email-libin.yang@linux.intel.com> Cc: libin.yang@intel.com, mengdong.lin@intel.com, Libin Yang Subject: [alsa-devel] [RFC PATCH v3 3/3] ALSA: Documentation about HDA DP MST pin init and connection X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP 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 ====