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Wed, 24 Jun 2020 10:33:17 +0000 From: Daniel Baluta To: khilman@kernel.org, ulf.hansson@linaro.org, linux-pm@vger.kernel.org, rjw@rjwysocki.net Subject: [PATCH v3 1/2] PM / domains: Introduce multi PM domains helpers Date: Wed, 24 Jun 2020 13:32:46 +0300 Message-Id: <20200624103247.7115-2-daniel.baluta@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200624103247.7115-1-daniel.baluta@oss.nxp.com> References: <20200624103247.7115-1-daniel.baluta@oss.nxp.com> X-ClientProxiedBy: AM0PR01CA0100.eurprd01.prod.exchangelabs.com (2603:10a6:208:10e::41) 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 AM0PR01CA0100.eurprd01.prod.exchangelabs.com (2603:10a6:208:10e::41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3109.22 via Frontend Transport; Wed, 24 Jun 2020 10:33:16 +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: cbd7c576-94c3-436f-b529-08d8182a01d8 X-MS-TrafficTypeDiagnostic: VI1PR0401MB2445: X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; 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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..b0a4d0109810 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, sizeof(*mpd), GFP_KERNEL); + 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..af1107731044 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; } + +static inline 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; } + +static inline 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