From patchwork Mon Aug 17 15:29:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bard Liao X-Patchwork-Id: 11719739 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 D40D814E3 for ; Tue, 18 Aug 2020 03:29:55 +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 6B411207DA for ; Tue, 18 Aug 2020 03:29:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="oSIRnuEu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B411207DA 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 E696616FD; Tue, 18 Aug 2020 05:29:08 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz E696616FD DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1597721394; bh=dbMz36uvgxZ3NEgtz+yQMBT5SO/ec3+4Nz+rLX86uqk=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=oSIRnuEu9wPFxjOBbV0pQ8txY1MHFDE7J35JDncwbduTpM2ZBGStSj6fCmvx3xR0x h9laHUjS9Iljie55TLgmr9QQRIia4gPzKdxEtWXsQ/xj+jAvXnR3SAULIVFhA0z08K LDKEi6B1jjFFipw9z1MYpw3tBeTl8NJ09r1XjIDM= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 87A10F80329; Tue, 18 Aug 2020 05:23:57 +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 37EA3F80307; Tue, 18 Aug 2020 05:23:52 +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 2E294F802FB for ; Tue, 18 Aug 2020 05:23:48 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 2E294F802FB IronPort-SDR: nc5eT6bHhYbc8r/AONp4Y9hfttcaHqR1Ru2UJX8OHkzeXQ/c1FR/PjENdtpiF6K3l74TgY3cyS d0qV+3cDAo3w== X-IronPort-AV: E=McAfee;i="6000,8403,9716"; a="152243046" X-IronPort-AV: E=Sophos;i="5.76,325,1592895600"; d="scan'208";a="152243046" 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 20:23:47 -0700 IronPort-SDR: xDqN1dgdDYDwVq+SeaUu259O1Kh52s9XmxAfAgtveXmBMi9SJcGrjrt3kAgQcxET5VTi57MJ8x Q0vGgDM+YHtA== X-IronPort-AV: E=Sophos;i="5.76,325,1592895600"; d="scan'208";a="441084662" 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 20:23:44 -0700 From: Bard Liao To: alsa-devel@alsa-project.org, vkoul@kernel.org Subject: [PATCH v2 09/12] soundwire: intel: add CLK_STOP_NOT_ALLOWED support Date: Mon, 17 Aug 2020 23:29:20 +0800 Message-Id: <20200817152923.3259-10-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: Pierre-Louis Bossart In case the clock needs to keep running, we need to prevent the Master from entering pm_runtime suspend. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- drivers/soundwire/intel.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index ad476e9e4d25..95b14c034ea7 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1367,6 +1367,7 @@ int intel_master_startup(struct platform_device *pdev) struct sdw_intel *sdw = cdns_to_intel(cdns); struct sdw_bus *bus = &cdns->bus; int link_flags; + u32 clock_stop_quirks; int ret; if (bus->prop.hw_disabled) { @@ -1423,6 +1424,20 @@ int intel_master_startup(struct platform_device *pdev) pm_runtime_enable(dev); } + clock_stop_quirks = sdw->link_res->clock_stop_quirks; + if (clock_stop_quirks & SDW_INTEL_CLK_STOP_NOT_ALLOWED) { + /* + * To keep the clock running we need to prevent + * pm_runtime suspend from happening by increasing the + * reference count. + * This quirk is specified by the parent PCI device in + * case of specific latency requirements. It will have + * no effect if pm_runtime is disabled by the user via + * a module parameter for testing purposes. + */ + pm_runtime_get_noresume(dev); + } + /* * The runtime PM status of Slave devices is "Unsupported" * until they report as ATTACHED. If they don't, e.g. because @@ -1454,6 +1469,11 @@ static int intel_master_remove(struct platform_device *pdev) struct sdw_intel *sdw = cdns_to_intel(cdns); struct sdw_bus *bus = &cdns->bus; + /* + * Since pm_runtime is already disabled, we don't decrease + * the refcount when the clock_stop_quirk is + * SDW_INTEL_CLK_STOP_NOT_ALLOWED + */ if (!bus->prop.hw_disabled) { intel_debugfs_exit(sdw); sdw_cdns_enable_interrupt(cdns, false);