From mboxrd@z Thu Jan 1 00:00:00 1970 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=-11.2 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 28618C433DF for ; Tue, 18 Aug 2020 03:23:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BB8020716 for ; Tue, 18 Aug 2020 03:23:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726839AbgHRDXy (ORCPT ); Mon, 17 Aug 2020 23:23:54 -0400 Received: from mga03.intel.com ([134.134.136.65]:63987 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726820AbgHRDXr (ORCPT ); Mon, 17 Aug 2020 23:23:47 -0400 IronPort-SDR: sZPM6vjB7w7FDhU+/SJDPTwwsLjSIjyKeqS/9Tl00//rzcLv+MnzChflUoavn6r3ZnrgIsCM7z 6fE22Av5Snfw== X-IronPort-AV: E=McAfee;i="6000,8403,9716"; a="154806518" X-IronPort-AV: E=Sophos;i="5.76,325,1592895600"; d="scan'208";a="154806518" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.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 Cc: vinod.koul@linaro.org, linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, rander.wang@linux.intel.com, ranjani.sridharan@linux.intel.com, hui.wang@canonical.com, pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com, mengdong.lin@intel.com, bard.liao@intel.com 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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); -- 2.17.1