From patchwork Wed Nov 10 22:14:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jim Quinlan X-Patchwork-Id: 12613417 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D90BC433F5 for ; Wed, 10 Nov 2021 22:18:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46A056112F for ; Wed, 10 Nov 2021 22:18:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233840AbhKJWUk (ORCPT ); Wed, 10 Nov 2021 17:20:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35068 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233537AbhKJWUZ (ORCPT ); Wed, 10 Nov 2021 17:20:25 -0500 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C6DC4C0797BE; Wed, 10 Nov 2021 14:15:22 -0800 (PST) Received: by mail-pl1-x62a.google.com with SMTP id q17so4127687plr.11; Wed, 10 Nov 2021 14:15:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=0gmJaKhK11nXMnfZy6D3iJ9fmoD5F9ICuC/zbPbZo8Q=; b=CyFcKDsRCa5KYV8P7aoQ8YPt6+N0dvzf0k5pBp/yR+OkQiQKbu6PUP3igdHtA/1Vwg rq/qiFYLcKcxRkjvVZsclFy8P1eaBIeIc5WD5mOFlMSTJ6KvKludpemuZsKwflpXIYRw 7zzgxJMXZuzUrhG0PdpiLoswDKQSYon4lyL1I9btrskMt8Tw32G2x+QfaePgb1PXeXrP gzk2MUqJ34v4ImuJAOJwj9kw2Ehv/v2cifrHCFsUP7Yv87JHopfGX/wQuijEuRGiKG7K W6hANVTrrAdyQn7jz192fbPeQP4RBdOUtreuSt3ivBVkTCVUUmKTxBj8RmMxImZ0yh+d mdgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=0gmJaKhK11nXMnfZy6D3iJ9fmoD5F9ICuC/zbPbZo8Q=; b=SoPFVNgeJvtPd89zXu+q4pIH4cf0M3j7GXSeRnl7qyBoL38hLgTT0FnlzXWaI/68F2 ivGL9CwDoooDRaFJH5K4fSBNs1Q4qAbp9nQGWfYK4v8YUX821OawjzF8BiKotf2lOTgv 1BZPwwN98RDNEkR6Zox1ZL/wiEwXWdbgsrOnXGdln+7MaaI59fIoUe6g6WT9bXHyeGxQ namHFmNJObfCngf/DE5qh3XP6cdC+LzpJd6np/ELOehefFUWRH5o7tFgusjTSKDjeJou Gy7h6M+8YzY4hAi9PqxA3lhXrq5qnRInU4rvdsdK5d5hKujPKe3wGnIhEzBGcfjv+JzF 4ROg== X-Gm-Message-State: AOAM5331sIKfl7829vA7vPs3w7cbWhb+RWOsBCoWLsrrC+8oXmx4MRzN zUnxzlTNNpvsu3qjwHWvBXwBXHG9y8RM3w== X-Google-Smtp-Source: ABdhPJzk+FzS5BpdWjqyeNXvbZIVEND/jsGBCPxnTd+iUyvwATjClj2jClYHrqmlG5iHfJsVtwcurg== X-Received: by 2002:a17:902:c145:b0:142:50c3:c2a with SMTP id 5-20020a170902c14500b0014250c30c2amr2786039plj.32.1636582522083; Wed, 10 Nov 2021 14:15:22 -0800 (PST) Received: from stbsrv-and-01.and.broadcom.net ([192.19.11.250]) by smtp.gmail.com with ESMTPSA id q11sm611774pfk.192.2021.11.10.14.15.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Nov 2021 14:15:21 -0800 (PST) From: Jim Quinlan To: linux-pci@vger.kernel.org, Bjorn Helgaas , Nicolas Saenz Julienne , Rob Herring , Mark Brown , bcm-kernel-feedback-list@broadcom.com, jim2101024@gmail.com, james.quinlan@broadcom.com Cc: Sean V Kelley , Jonathan Cameron , Qiuxu Zhuo , Keith Busch , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v8 6/8] PCI/portdrv: Do not turn off subdev regulators if EP can wake up Date: Wed, 10 Nov 2021 17:14:46 -0500 Message-Id: <20211110221456.11977-7-jim2101024@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211110221456.11977-1-jim2101024@gmail.com> References: <20211110221456.11977-1-jim2101024@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If any downstream device may wake up during S2/S3 suspend, we do not want to turn off its power when suspending. Signed-off-by: Jim Quinlan --- drivers/pci/pci.h | 1 + drivers/pci/pcie/portdrv_pci.c | 43 +++++++++++++++++++++++++++++----- 2 files changed, 38 insertions(+), 6 deletions(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 3f6cf75b91cc..27abb977d0ec 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -746,6 +746,7 @@ extern const struct attribute_group aspm_ctrl_attr_group; extern const struct attribute_group pci_dev_reset_method_attr_group; struct subdev_regulators { + bool ep_wakeup_capable; unsigned int num_supplies; struct regulator_bulk_data supplies[]; }; diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 9330cfbebdc1..717e816d0fc8 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -111,24 +111,55 @@ bool pcie_is_port_dev(struct pci_dev *dev) } EXPORT_SYMBOL_GPL(pcie_is_port_dev); +static int pci_dev_may_wakeup(struct pci_dev *dev, void *data) +{ + bool *ret = data; + + if (device_may_wakeup(&dev->dev)) { + *ret = true; + dev_dbg(&dev->dev, "disable cancelled for wake-up device\n"); + } + return (int) *ret; +} + static int subdev_regulator_resume(struct pci_dev *dev) { struct subdev_regulators *sr = dev->dev.driver_data; - if (sr) - return regulator_bulk_enable(sr->num_supplies, sr->supplies); + if (!sr) + return 0; - return 0; + if (sr->ep_wakeup_capable) { + /* + * We are resuming from a suspend. In the previous suspend + * we did not disable the power supplies, so there is no + * need to enable them (and falsely increase their usage + * count). + */ + sr->ep_wakeup_capable = false; + return 0; + } + + return regulator_bulk_enable(sr->num_supplies, sr->supplies); } static int subdev_regulator_suspend(struct pci_dev *dev, pm_message_t state) { struct subdev_regulators *sr = dev->dev.driver_data; - if (sr) - return regulator_bulk_disable(sr->num_supplies, sr->supplies); + if (!sr) + return 0; + /* + * If at least one device on this bus is enabled as a + * wake-up source, do not turn off regulators. + */ + sr->ep_wakeup_capable = false; + pci_walk_bus(dev->bus, pci_dev_may_wakeup, + &sr->ep_wakeup_capable); + if (sr->ep_wakeup_capable) + return 0; - return 0; + return regulator_bulk_disable(sr->num_supplies, sr->supplies); } /*