From patchwork Mon Jun 15 09:57:30 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 6607711 Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E32B89F326 for ; Mon, 15 Jun 2015 10:00:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9ED7F203E5 for ; Mon, 15 Jun 2015 10:00:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3CB162045E for ; Mon, 15 Jun 2015 10:00:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756034AbbFOJ6Z (ORCPT ); Mon, 15 Jun 2015 05:58:25 -0400 Received: from mga14.intel.com ([192.55.52.115]:61144 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754755AbbFOJ5r (ORCPT ); Mon, 15 Jun 2015 05:57:47 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga103.fm.intel.com with ESMTP; 15 Jun 2015 02:57:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,618,1427785200"; d="scan'208";a="746853401" Received: from black.fi.intel.com ([10.237.72.86]) by orsmga002.jf.intel.com with ESMTP; 15 Jun 2015 02:57:42 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 7996FAD; Mon, 15 Jun 2015 12:57:41 +0300 (EEST) From: Andy Shevchenko To: "Rafael J . Wysocki" , linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, Greg Kroah-Hartman , Vinod Koul , Lee Jones , Andrew Morton , Mika Westerberg , linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, Heikki Krogerus , Jarkko Nikula , "Wysocki, Rafael J" , Mike Turquette Cc: Andy Shevchenko Subject: [PATCH v4 2/8] ACPI / PM: Attach ACPI power domain only once Date: Mon, 15 Jun 2015 12:57:30 +0300 Message-Id: <1434362256-239992-3-git-send-email-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1434362256-239992-1-git-send-email-andriy.shevchenko@linux.intel.com> References: <1434362256-239992-1-git-send-email-andriy.shevchenko@linux.intel.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Mika Westerberg Some devices, like MFD subdevices, share a single ACPI companion device so that they are able to access their resources and children. However, currently all these subdevices are attached to the ACPI power domain and this might cause that the power methods for the companion device get called more than once. In order to solve this we attach the ACPI power domain only to the first physical device that is bound to the ACPI companion device. In case of MFD devices, this is the parent MFD device itself. Acked-by: Rafael J. Wysocki Signed-off-by: Mika Westerberg Signed-off-by: Andy Shevchenko --- drivers/acpi/device_pm.c | 8 ++++++++ drivers/acpi/internal.h | 2 ++ drivers/acpi/scan.c | 46 ++++++++++++++++++++++++++++++---------------- 3 files changed, 40 insertions(+), 16 deletions(-) diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 735db11..7d0c7e9 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -1103,6 +1103,14 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) if (dev->pm_domain) return -EEXIST; + /* + * Only attach the power domain to the first device if the + * companion is shared by multiple. This is to prevent doing power + * management twice. + */ + if (!acpi_device_is_first_physical_node(adev, dev)) + return -EBUSY; + acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); dev->pm_domain = &acpi_general_pm_domain; if (power_on) { diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index ba4a61e..c26a951 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -96,6 +96,8 @@ void acpi_device_add_finalize(struct acpi_device *device); void acpi_free_pnp_ids(struct acpi_device_pnp *pnp); bool acpi_device_is_present(struct acpi_device *adev); bool acpi_device_is_battery(struct acpi_device *adev); +bool acpi_device_is_first_physical_node(struct acpi_device *adev, + const struct device *dev); /* -------------------------------------------------------------------------- Power Resource diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 03141aa..37f8f74 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -223,6 +223,35 @@ static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, return len; } +/** + * acpi_device_is_first_physical_node - Is given dev first physical node + * @adev: ACPI companion device + * @dev: Physical device to check + * + * Function checks if given @dev is the first physical devices attached to + * the ACPI companion device. This distinction is needed in some cases + * where the same companion device is shared between many physical devices. + * + * Note that the caller have to provide valid @adev pointer. + */ +bool acpi_device_is_first_physical_node(struct acpi_device *adev, + const struct device *dev) +{ + bool ret = false; + + mutex_lock(&adev->physical_node_lock); + if (!list_empty(&adev->physical_node_list)) { + const struct acpi_device_physical_node *node; + + node = list_first_entry(&adev->physical_node_list, + struct acpi_device_physical_node, node); + ret = node->dev == dev; + } + mutex_unlock(&adev->physical_node_lock); + + return ret; +} + /* * acpi_companion_match() - Can we match via ACPI companion device * @dev: Device in question @@ -247,7 +276,6 @@ static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, static struct acpi_device *acpi_companion_match(const struct device *dev) { struct acpi_device *adev; - struct mutex *physical_node_lock; adev = ACPI_COMPANION(dev); if (!adev) @@ -256,21 +284,7 @@ static struct acpi_device *acpi_companion_match(const struct device *dev) if (list_empty(&adev->pnp.ids)) return NULL; - physical_node_lock = &adev->physical_node_lock; - mutex_lock(physical_node_lock); - if (list_empty(&adev->physical_node_list)) { - adev = NULL; - } else { - const struct acpi_device_physical_node *node; - - node = list_first_entry(&adev->physical_node_list, - struct acpi_device_physical_node, node); - if (node->dev != dev) - adev = NULL; - } - mutex_unlock(physical_node_lock); - - return adev; + return acpi_device_is_first_physical_node(adev, dev) ? adev : NULL; } static int __acpi_device_uevent_modalias(struct acpi_device *adev,