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=-11.5 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,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 CA7BAC433E1 for ; Wed, 22 Jul 2020 08:31:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AF2B322CA0 for ; Wed, 22 Jul 2020 08:31:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728724AbgGVIbt (ORCPT ); Wed, 22 Jul 2020 04:31:49 -0400 Received: from mga04.intel.com ([192.55.52.120]:10111 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726147AbgGVIbs (ORCPT ); Wed, 22 Jul 2020 04:31:48 -0400 IronPort-SDR: gwdzrZV8kkag3RT1g+/TVhA83eo7EZMwtpzFMRt+5Em2pG2QXJdTxKokhrB5oSSTA/KPEsuNWH qNg8SotQxTDA== X-IronPort-AV: E=McAfee;i="6000,8403,9689"; a="147787951" X-IronPort-AV: E=Sophos;i="5.75,381,1589266800"; d="scan'208";a="147787951" 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; 22 Jul 2020 01:31:48 -0700 IronPort-SDR: PvAEKZv+qpQ+GdZaWS5N/8uJnBcw2oEDj56hyXGUACViOog9I07fC1uBSGQVW6dteYspJvl8AW lsP+4lpwdTAw== X-IronPort-AV: E=Sophos;i="5.75,381,1589266800"; d="scan'208";a="432303146" 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; 22 Jul 2020 01:31:43 -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, slawomir.blauciak@intel.com, mengdong.lin@intel.com, bard.liao@intel.com Subject: [PATCH 01/13] soundwire: intel: Add basic power management support Date: Wed, 22 Jul 2020 04:37:11 +0800 Message-Id: <20200721203723.18305-2-yung-chuan.liao@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200721203723.18305-1-yung-chuan.liao@linux.intel.com> References: <20200721203723.18305-1-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 Implement suspend/resume capabilities (not runtime_pm for now) The resume part is essentially a full-blown re-enumeration. When S0ix is supported, we will select clock stop mode when the ACPI target state is S0, and tear down the link for S3. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Bard Liao --- drivers/soundwire/intel.c | 81 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 79 insertions(+), 2 deletions(-) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 23b66dcf9966..eb628f255cf5 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -463,7 +463,7 @@ static void intel_shim_wake(struct sdw_intel *sdw, bool wake_enable) mutex_unlock(sdw->link_res->shim_lock); } -static int __maybe_unused intel_link_power_down(struct sdw_intel *sdw) +static int intel_link_power_down(struct sdw_intel *sdw) { int link_control, spa_mask, cpa_mask; unsigned int link_id = sdw->instance; @@ -1375,12 +1375,89 @@ int intel_master_process_wakeen_event(struct platform_device *pdev) return 0; } +/* + * PM calls + */ + +#ifdef CONFIG_PM + +static int intel_suspend(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + int ret; + + if (bus->prop.hw_disabled) { + dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", + bus->link_id); + return 0; + } + + ret = sdw_cdns_enable_interrupt(cdns, false); + if (ret < 0) { + dev_err(dev, "cannot disable interrupts on suspend\n"); + return ret; + } + + ret = intel_link_power_down(sdw); + if (ret) { + dev_err(dev, "Link power down failed: %d", ret); + return ret; + } + + intel_shim_wake(sdw, false); + + return 0; +} + +static int intel_resume(struct device *dev) +{ + struct sdw_cdns *cdns = dev_get_drvdata(dev); + struct sdw_intel *sdw = cdns_to_intel(cdns); + struct sdw_bus *bus = &cdns->bus; + int ret; + + if (bus->prop.hw_disabled) { + dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", + bus->link_id); + return 0; + } + + ret = intel_init(sdw); + if (ret) { + dev_err(dev, "%s failed: %d", __func__, ret); + return ret; + } + + ret = sdw_cdns_enable_interrupt(cdns, true); + if (ret < 0) { + dev_err(dev, "cannot enable interrupts during resume\n"); + return ret; + } + + ret = sdw_cdns_exit_reset(cdns); + if (ret < 0) { + dev_err(dev, "unable to exit bus reset sequence during resume\n"); + return ret; + } + + return ret; +} + +#endif + +static const struct dev_pm_ops intel_pm = { + SET_SYSTEM_SLEEP_PM_OPS(intel_suspend, intel_resume) +}; + static struct platform_driver sdw_intel_drv = { .probe = intel_master_probe, .remove = intel_master_remove, .driver = { .name = "intel-sdw", - }, + .pm = &intel_pm, + } }; module_platform_driver(sdw_intel_drv); -- 2.17.1