From patchwork Tue Sep 1 15:05:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Liao, Bard" X-Patchwork-Id: 291894 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00, DATE_IN_PAST_06_12, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C9C8C433E6 for ; Wed, 2 Sep 2020 03:05:05 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B6E02206CD for ; Wed, 2 Sep 2020 03:05:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="Y3qUm3Sb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B6E02206CD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 45C53180A; Wed, 2 Sep 2020 05:04:13 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 45C53180A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1599015903; bh=hagcKcLRa2aSAj26hDePR792qXZ56u6eyook9AvGge0=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=Y3qUm3SbGho14XgsaaBHDAdj0lCpcF+UdqfSHBrbITb+uXoFaaQhQwtcT+mVTRCZZ ji2qgUtaP2BC60TnDMUl5JIaZwinn3d2+tJ3Vv+0R69NlbxhDjKs8dEM1Fz641pLZ7 Y1Q0xrLeg+IVpkPiszJ1cVltgJF72aX6LO7c0HGQ= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 2975FF802E8; Wed, 2 Sep 2020 05:00:35 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 7058CF802D2; Wed, 2 Sep 2020 05:00:09 +0200 (CEST) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 2CC6BF80276 for ; Wed, 2 Sep 2020 05:00:00 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 2CC6BF80276 IronPort-SDR: a9a9HhruDom6R4NhEUJsaZYbnOfHZQMWhlnsoaiuKUpMP5lUtja76MtxXQ+UV5oCTy+OEGgq/e G2DrFRReuvyg== X-IronPort-AV: E=McAfee;i="6000,8403,9731"; a="156570759" X-IronPort-AV: E=Sophos;i="5.76,381,1592895600"; d="scan'208";a="156570759" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2020 19:59:59 -0700 IronPort-SDR: rcN5K088Nt+PHXwuEobRqiOjwrhP7Ui2uAlCwbs5vFNhaKDCvU+840R4QObVqBbi7K4KQwwrUp Za/1Gxszdwkw== X-IronPort-AV: E=Sophos;i="5.76,381,1592895600"; d="scan'208";a="283588096" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2020 19:59:56 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH v2 05/10] soundwire: bus: update multi-link definition with hw sync details Date: Tue, 1 Sep 2020 23:05:51 +0800 Message-Id: <20200901150556.19432-6-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200901150556.19432-1-yung-chuan.liao@linux.intel.com> References: <20200901150556.19432-1-yung-chuan.liao@linux.intel.com> Cc: pierre-louis.bossart@linux.intel.com, vinod.koul@linaro.org, tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, mengdong.lin@intel.com, sanyog.r.kale@intel.com, rander.wang@linux.intel.com, bard.liao@intel.com X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 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: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Pierre-Louis Bossart Hardware-based synchronization is typically required when the bus->multi_link flag is set. On Intel platforms, when the Cadence IP is configured in 'Multi Master Mode', the hardware synchronization is required even when a stream only uses a single segment. The existing code only deal with hardware synchronization when a stream uses more than one segment so to remain backwards compatible we add a configuration threshold. For Intel cases this threshold will be set to one, other platforms may be able to use the SSP-based sync in those cases. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- include/linux/soundwire/sdw.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index 76052f12c9f7..9adbe4fd7980 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -827,6 +827,11 @@ struct sdw_master_ops { * @multi_link: Store bus property that indicates if multi links * are supported. This flag is populated by drivers after reading * appropriate firmware (ACPI/DT). + * @hw_sync_min_links: Number of links used by a stream above which + * hardware-based synchronization is required. This value is only + * meaningful if multi_link is set. If set to 1, hardware-based + * synchronization will be used even if a stream only uses a single + * SoundWire segment. */ struct sdw_bus { struct device *dev; @@ -850,6 +855,7 @@ struct sdw_bus { unsigned int clk_stop_timeout; u32 bank_switch_timeout; bool multi_link; + int hw_sync_min_links; }; int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,