From patchwork Mon Aug 17 15:29:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 11719745 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 48153722 for ; Tue, 18 Aug 2020 03:31:34 +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 D1C462053B for ; Tue, 18 Aug 2020 03:31:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="SlSnkFad" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1C462053B 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 DA9381704; Tue, 18 Aug 2020 05:30:44 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz DA9381704 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1597721492; bh=OU12N0xIwtKIpxoauzHjLnH9K6qMkiHDZvHrYqaZjKQ=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=SlSnkFadGyNI3AxyuQu2KCBr+qwc1SGIP8Pu3zpxjTTic0rHypCbQDgojDnQe7OR1 Do5rZA26G6sECt23tvSZdwLCsyp4Of2RTUZTw2VaNHEBQ/QKxtQJ3bCW+ntBVYT5AQ uvryoYhG6Yzg/95WlQO0J3NpBUtMvnenE15O9ghs= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 8B96FF80339; Tue, 18 Aug 2020 05:24:07 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id 44D94F80337; Tue, 18 Aug 2020 05:24:04 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: * X-Spam-Status: No, score=1.1 required=5.0 tests=DATE_IN_PAST_06_12, SPF_HELO_NONE,SPF_NONE,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) (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 580E5F80332 for ; Tue, 18 Aug 2020 05:23:59 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 580E5F80332 IronPort-SDR: uznjGXK0trAT2rjng4qkvu3ockgNndK/40YhR6qwAcHjANWJZKHyBslafSsL1H2AxbH3qvCA01 8leTf9IVV+5g== X-IronPort-AV: E=McAfee;i="6000,8403,9716"; a="152243063" X-IronPort-AV: E=Sophos;i="5.76,325,1592895600"; d="scan'208";a="152243063" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2020 20:23:59 -0700 IronPort-SDR: /0Oiq2v7oEO84PBx8dCyDdQi/1XbxcWWPi6v556zk6rS9vG1ZN1eleiwG363IJlo5D8HsdMVSm gXzHDtA98TLw== X-IronPort-AV: E=Sophos;i="5.76,325,1592895600"; d="scan'208";a="441084704" Received: from bard-ubuntu.sh.intel.com ([10.239.13.33]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Aug 2020 20:23:55 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH v2 12/12] soundwire: intel: refine runtime pm for SDW_INTEL_CLK_STOP_BUS_RESET Date: Mon, 17 Aug 2020 23:29:23 +0800 Message-Id: <20200817152923.3259-13-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200817152923.3259-1-yung-chuan.liao@linux.intel.com> References: <20200817152923.3259-1-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: Rander Wang When all the links are suspended, the HDaudio controller may suspend and the power rails to the SoundWire IP may be disabled, requiring a complete re-initialization/enumeration on resume. However, if one or more Masters remained active, the HDaudio controller will remain active and the power rails will remain enabled. As a result, during the link resume step we can check if the context was preserved by verifying if the clock was stopped, and avoid doing a complete bus reset and re-enumeration. Signed-off-by: Rander Wang Signed-off-by: Bard Liao --- drivers/soundwire/intel.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 2899445e2649..dbcbe2708563 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1698,6 +1698,8 @@ static int intel_resume_runtime(struct device *dev) struct sdw_intel *sdw = cdns_to_intel(cdns); struct sdw_bus *bus = &cdns->bus; u32 clock_stop_quirks; + bool clock_stop0; + int status; int ret; if (bus->prop.hw_disabled) { @@ -1739,11 +1741,24 @@ static int intel_resume_runtime(struct device *dev) return ret; } + /* + * An exception condition occurs for the CLK_STOP_BUS_RESET + * case if one or more masters remain active. In this condition, + * all the masters are powered on for they are in the same power + * domain. Master can preserve its context for clock stop0, so + * there is no need to clear slave status and reset bus. + */ + clock_stop0 = sdw_cdns_is_clock_stop(&sdw->cdns); + /* * make sure all Slaves are tagged as UNATTACHED and * provide reason for reinitialization */ - sdw_clear_slave_status(bus, SDW_UNATTACH_REQUEST_MASTER_RESET); + if (!clock_stop0) { + status = SDW_UNATTACH_REQUEST_MASTER_RESET; + sdw_clear_slave_status(bus, status); + } + ret = sdw_cdns_enable_interrupt(cdns, true); if (ret < 0) { @@ -1751,7 +1766,7 @@ static int intel_resume_runtime(struct device *dev) return ret; } - ret = sdw_cdns_clock_restart(cdns, true); + ret = sdw_cdns_clock_restart(cdns, !clock_stop0); if (ret < 0) { dev_err(dev, "unable to restart clock during resume\n"); return ret;