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Tue, 23 Jun 2020 11:33:32 +0000 From: Daniel Baluta To: khilman@kernel.org, ulf.hansson@linaro.org, linux-pm@vger.kernel.org, rjw@rjwysocki.net Subject: [RESEND PATCH v2 1/2] PM / domains: Introduce multi PM domains helpers Date: Tue, 23 Jun 2020 14:33:00 +0300 Message-Id: <20200623113301.631-2-daniel.baluta@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200623113301.631-1-daniel.baluta@oss.nxp.com> References: <20200623113301.631-1-daniel.baluta@oss.nxp.com> X-ClientProxiedBy: AM0PR06CA0131.eurprd06.prod.outlook.com (2603:10a6:208:ab::36) To VI1PR0401MB2287.eurprd04.prod.outlook.com (2603:10a6:800:2e::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from fsr-ub1864-103.ro-buh02.nxp.com (83.217.231.2) by AM0PR06CA0131.eurprd06.prod.outlook.com (2603:10a6:208:ab::36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3109.22 via Frontend Transport; Tue, 23 Jun 2020 11:33:31 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [83.217.231.2] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 35c7ebc7-6246-434f-686f-08d817694231 X-MS-TrafficTypeDiagnostic: VI1PR0401MB2558: X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-Forefront-PRVS: 04433051BF X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: p9B6nf0CPdPiL0T8s2DUHroSuthx0rWkIZCTQNTu4F0R964u+Q5pVDHa9oxkvDvMssrV9r+xgrDvBkBrK7eUuGIvbDbRZ+lYhlNZMk0/sghevvoQGee1Rqnl4hjU2t6mMXJcZQ03/L57SWHzSLZwS0ZlJlM0nFzlKvQrMyPGTWZwqGie7w9TalkUePFILdTT/YYisihsp9HqbK1gTr0zmF+vVp/KwHXq07f2PBpXn1lMWXEYjXNTTDwof6y4sbPMqqeaGR8MoxCR4IFA7H4e6jxujWl75+2+y/AdEDngFTiFR+Wu8gb9RUrMwPYNqqVV/XksTcyFAMIzppcTXxMKyA== X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:VI1PR0401MB2287.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(4636009)(366004)(66946007)(6506007)(4326008)(5660300002)(498600001)(44832011)(66476007)(8936002)(66556008)(956004)(86362001)(2616005)(6666004)(8676002)(6486002)(26005)(83380400001)(52116002)(186003)(2906002)(1076003)(16526019)(6512007); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: BFxOYUZzmwn4ruSXPT8aPsf6cquZeuLkz+8zPvsYS7MgGmWoSiUvr1b5aVA+aK15pOjs68qZ9v/jBGSINMHKqDgTZ1qMn26DThxq+sP0+7Uri1aT1HE0vOSpyOYLeipQN0GGaTVodHw+jiFg2fxAv2dQg9Pz3iNipwkLWgxjfjOwBwgoxZGQhQ4CrjYXvwafnwKx/5Xkrr9w9DytWfrQhGBubtShB22+c8WOEbKRUbzIoDM7alPiVa2DP497l8ir4J6BcHSdy4Oag9Us2EJdBfu/A9OkasN+Ky9b63vPvxa8Y/F/Y/mcacbpVffH5IavEl6vgrM3EJA1GuTDOWjMdrUFD3krx4b8RP/5oUs6QgLBa8Zrk4TVO40+wCLHOcCm+pUpLMNdYmlKeyt84qqsn7DJLbO3FBW76/01aSo+LCfZ0pa6V350DImlJlENSaltVvWe6oyXi2NEj2NnsM7UEjN/0SksAYrgy4rhWcTU3aE= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 35c7ebc7-6246-434f-686f-08d817694231 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jun 2020 11:33:32.4853 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: xg6fl+/o/gFwcyC9Ku2YTEABSPMwv6P7r2uRfT8008mKizNQhwBggS32pEFd1PyXB2DrhuYxPrtT7XBG9TfDZg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0401MB2558 Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-imx@nxp.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: Daniel Baluta This patch introduces helpers support for multi PM domains. API consists of: 1) dev_multi_pm_attach - powers up all PM domains associated with a given device. Because we can attach one PM domain per device, we create virtual devices (children of initial device) and associate PM domains one per virtual device. 2) dev_multi_pm_detach - detaches all virtual devices from PM domains attached with. Signed-off-by: Daniel Baluta --- drivers/base/power/common.c | 93 +++++++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 19 ++++++++ 2 files changed, 112 insertions(+) diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c index bbddb267c2e6..6d1f142833b1 100644 --- a/drivers/base/power/common.c +++ b/drivers/base/power/common.c @@ -228,3 +228,96 @@ void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd) device_pm_check_callbacks(dev); } EXPORT_SYMBOL_GPL(dev_pm_domain_set); + +/** + * dev_multi_pm_attach - power up device associated power domains + * @dev: The device used to lookup the PM domains + * + * Parse device's OF node to find all PM domains specifiers. For each power + * domain found, create a virtual device and associate it with the + * current power domain. + * + * This function should typically be invoked by a driver during the + * probe phase, in the case its device requires power management through + * multiple PM domains. + * + * Returns a pointer to @dev_multi_pm_domain_data if successfully attached PM + * domains, NULL when the device doesn't need a PM domain or when single + * power-domains exists for it, else an ERR_PTR() in case of + * failures. + */ +struct dev_multi_pm_domain_data *dev_multi_pm_attach(struct device *dev) +{ + struct dev_multi_pm_domain_data *mpd, *retp; + int num_domains; + int i; + + num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", + "#power-domain-cells"); + if (num_domains < 2) + return NULL; + + mpd = devm_kzalloc(dev, GFP_KERNEL, sizeof(*mpd)); + if (!mpd) + return ERR_PTR(-ENOMEM); + + mpd->dev = dev; + mpd->num_domains = num_domains; + + mpd->virt_devs = devm_kmalloc_array(dev, mpd->num_domains, + sizeof(*mpd->virt_devs), + GFP_KERNEL); + if (!mpd->virt_devs) + return ERR_PTR(-ENOMEM); + + mpd->links = devm_kmalloc_array(dev, mpd->num_domains, + sizeof(*mpd->links), GFP_KERNEL); + if (!mpd->links) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < mpd->num_domains; i++) { + mpd->virt_devs[i] = dev_pm_domain_attach_by_id(dev, i); + if (IS_ERR(mpd->virt_devs[i])) { + retp = (struct dev_multi_pm_domain_data *) + mpd->virt_devs[i]; + goto exit_unroll_pm; + } + mpd->links[i] = device_link_add(dev, mpd->virt_devs[i], + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + if (!mpd->links[i]) { + retp = ERR_PTR(-ENOMEM); + dev_pm_domain_detach(mpd->virt_devs[i], false); + goto exit_unroll_pm; + } + } + return mpd; + +exit_unroll_pm: + while (--i >= 0) { + device_link_del(mpd->links[i]); + dev_pm_domain_detach(mpd->virt_devs[i], false); + } + + return retp; +} +EXPORT_SYMBOL(dev_multi_pm_attach); + +/** + * dev_multi_pm_detach - Detach a device from its PM domains. + * Each multi power domain is attached to a virtual children device + * + * @mpd: multi power domains data, contains the association between + * virtul device and PM domain + */ +void dev_multi_pm_detach(struct dev_multi_pm_domain_data *mpd) +{ + int i; + + for (i = 0; i < mpd->num_domains; i++) { + device_link_del(mpd->links[i]); + dev_pm_domain_detach(mpd->virt_devs[i], false); + } +} +EXPORT_SYMBOL(dev_multi_pm_detach); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 9ec78ee53652..5bcb35150af2 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -183,6 +183,13 @@ struct generic_pm_domain_data { void *data; }; +struct dev_multi_pm_domain_data { + struct device *dev; /* parent device */ + struct device **virt_devs; /* virtual children links */ + struct device_link **links; /* links parent <-> virtual children */ + int num_domains; +}; + #ifdef CONFIG_PM_GENERIC_DOMAINS static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) { @@ -369,18 +376,27 @@ struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) #ifdef CONFIG_PM int dev_pm_domain_attach(struct device *dev, bool power_on); +struct dev_multi_pm_domain_data *dev_multi_pm_attach(struct device *dev); struct device *dev_pm_domain_attach_by_id(struct device *dev, unsigned int index); struct device *dev_pm_domain_attach_by_name(struct device *dev, const char *name); void dev_pm_domain_detach(struct device *dev, bool power_off); int dev_pm_domain_start(struct device *dev); +void dev_multi_pm_detach(struct dev_multi_pm_domain_data *mpd); void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd); + #else static inline int dev_pm_domain_attach(struct device *dev, bool power_on) { return 0; } + +struct dev_multi_pm_domain_data *dev_multi_pm_attach(struct device *dev) +{ + return NULL; +} + static inline struct device *dev_pm_domain_attach_by_id(struct device *dev, unsigned int index) { @@ -396,6 +412,9 @@ static inline int dev_pm_domain_start(struct device *dev) { return 0; } + +void dev_multi_pm_detach(struct dev_multi_pm_domain_data *mpd) {} + static inline void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd) {} #endif