39dd0f234f
If a PM domain is powered off when the first device starts its system PM prepare phase, genpd prevents any further attempts to power on the PM domain during the following system PM phases. Not until the system PM complete phase is finalized for all devices in the PM domain, genpd again allows it to be powered on. This behaviour needs to be changed, as a subsystem/driver for a device in the same PM domain may still need to be able to serve requests in some of the system PM phases. Accordingly, it may need to runtime resume its device and thus also request the corresponding PM domain to be powered on. To deal with these scenarios, let's make the device operational in the system PM prepare phase by runtime resuming it, no matter if the PM domain is powered on or off. Changing this also enables us to remove genpd's suspend_power_off flag, as it's being used to track this condition. Additionally, we must allow the PM domain to be powered on via runtime PM during the system PM phases. This change also requires a fix in the AMD ACP (Audio CoProcessor) drm driver. It registers a genpd to model the ACP as a PM domain, but unfortunately it's also abuses genpd's "internal" suspend_power_off flag to deal with a corner case at system PM resume. More precisely, the so called SMU block powers on the ACP at system PM resume, unconditionally if it's being used or not. This may lead to that genpd's internal status of the power state, may not correctly reflect the power state of the HW after a system PM resume. Because of changing the behaviour of genpd, by runtime resuming devices in the prepare phase, the AMD ACP drm driver no longer have to deal with this corner case. So let's just drop the related code in this driver. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Acked-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
261 lines
7.7 KiB
C
261 lines
7.7 KiB
C
/*
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* pm_domain.h - Definitions and headers related to device power domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#ifndef _LINUX_PM_DOMAIN_H
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#define _LINUX_PM_DOMAIN_H
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/notifier.h>
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/* Defines used for the flags field in the struct generic_pm_domain */
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#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
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#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */
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enum gpd_status {
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GPD_STATE_ACTIVE = 0, /* PM domain is active */
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GPD_STATE_POWER_OFF, /* PM domain is off */
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};
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struct dev_power_governor {
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bool (*power_down_ok)(struct dev_pm_domain *domain);
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bool (*suspend_ok)(struct device *dev);
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};
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struct gpd_dev_ops {
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int (*start)(struct device *dev);
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int (*stop)(struct device *dev);
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bool (*active_wakeup)(struct device *dev);
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};
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struct genpd_power_state {
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s64 power_off_latency_ns;
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s64 power_on_latency_ns;
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};
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struct generic_pm_domain {
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struct dev_pm_domain domain; /* PM domain operations */
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struct list_head gpd_list_node; /* Node in the global PM domains list */
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struct list_head master_links; /* Links with PM domain as a master */
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struct list_head slave_links; /* Links with PM domain as a slave */
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struct list_head dev_list; /* List of devices */
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struct mutex lock;
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struct dev_power_governor *gov;
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struct work_struct power_off_work;
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const char *name;
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atomic_t sd_count; /* Number of subdomains with power "on" */
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enum gpd_status status; /* Current state of the domain */
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unsigned int device_count; /* Number of devices */
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unsigned int suspended_count; /* System suspend device counter */
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unsigned int prepared_count; /* Suspend counter of prepared devices */
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int (*power_off)(struct generic_pm_domain *domain);
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int (*power_on)(struct generic_pm_domain *domain);
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struct gpd_dev_ops dev_ops;
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s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
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bool max_off_time_changed;
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bool cached_power_down_ok;
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int (*attach_dev)(struct generic_pm_domain *domain,
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struct device *dev);
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void (*detach_dev)(struct generic_pm_domain *domain,
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struct device *dev);
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unsigned int flags; /* Bit field of configs for genpd */
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struct genpd_power_state states[GENPD_MAX_NUM_STATES];
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unsigned int state_count; /* number of states */
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unsigned int state_idx; /* state that genpd will go to when off */
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};
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static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
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{
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return container_of(pd, struct generic_pm_domain, domain);
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}
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struct gpd_link {
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struct generic_pm_domain *master;
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struct list_head master_node;
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struct generic_pm_domain *slave;
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struct list_head slave_node;
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};
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struct gpd_timing_data {
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s64 suspend_latency_ns;
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s64 resume_latency_ns;
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s64 effective_constraint_ns;
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bool constraint_changed;
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bool cached_suspend_ok;
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};
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struct pm_domain_data {
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struct list_head list_node;
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struct device *dev;
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};
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struct generic_pm_domain_data {
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struct pm_domain_data base;
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struct gpd_timing_data td;
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struct notifier_block nb;
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};
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#ifdef CONFIG_PM_GENERIC_DOMAINS
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static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
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{
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return container_of(pdd, struct generic_pm_domain_data, base);
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}
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return to_gpd_data(dev->power.subsys_data->domain_data);
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}
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extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
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extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td);
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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev);
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extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_subdomain);
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extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target);
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extern void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off);
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extern struct dev_power_governor simple_qos_governor;
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extern struct dev_power_governor pm_domain_always_on_gov;
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#else
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
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{
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return NULL;
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}
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static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_sd)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off)
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{
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}
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#endif
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return __pm_genpd_add_device(genpd, dev, NULL);
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}
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#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
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extern void pm_genpd_syscore_poweroff(struct device *dev);
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extern void pm_genpd_syscore_poweron(struct device *dev);
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#else
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static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
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static inline void pm_genpd_syscore_poweron(struct device *dev) {}
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#endif
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/* OF PM domain providers */
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struct of_device_id;
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struct genpd_onecell_data {
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struct generic_pm_domain **domains;
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unsigned int num_domains;
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};
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typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
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void *data);
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
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int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
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void *data);
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void of_genpd_del_provider(struct device_node *np);
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struct generic_pm_domain *of_genpd_get_from_provider(
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struct of_phandle_args *genpdspec);
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struct generic_pm_domain *__of_genpd_xlate_simple(
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struct of_phandle_args *genpdspec,
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void *data);
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struct generic_pm_domain *__of_genpd_xlate_onecell(
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struct of_phandle_args *genpdspec,
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void *data);
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int genpd_dev_pm_attach(struct device *dev);
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#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
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static inline int __of_genpd_add_provider(struct device_node *np,
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genpd_xlate_t xlate, void *data)
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{
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return 0;
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}
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static inline void of_genpd_del_provider(struct device_node *np) {}
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static inline struct generic_pm_domain *of_genpd_get_from_provider(
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struct of_phandle_args *genpdspec)
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{
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return NULL;
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}
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#define __of_genpd_xlate_simple NULL
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#define __of_genpd_xlate_onecell NULL
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static inline int genpd_dev_pm_attach(struct device *dev)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
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static inline int of_genpd_add_provider_simple(struct device_node *np,
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struct generic_pm_domain *genpd)
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{
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return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
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}
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static inline int of_genpd_add_provider_onecell(struct device_node *np,
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struct genpd_onecell_data *data)
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{
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return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
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}
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#ifdef CONFIG_PM
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extern int dev_pm_domain_attach(struct device *dev, bool power_on);
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extern void dev_pm_domain_detach(struct device *dev, bool power_off);
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extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
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#else
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static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
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{
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return -ENODEV;
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}
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static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
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static inline void dev_pm_domain_set(struct device *dev,
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struct dev_pm_domain *pd) {}
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#endif
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#endif /* _LINUX_PM_DOMAIN_H */
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