Merge branch 'pm-domains'
* pm-domains: PM / Domains: Fix compatible for domain idle state PM / Domains: Do not print PM domain add error message if EPROBE_DEFER PM / Domains: Fix a warning message PM / Domains: check for negative return from of_count_phandle_with_args() PM / doc: Update device documentation for devices in IRQ-safe PM domains PM / Domains: Support IRQ safe PM domains PM / Domains: Abstract genpd locking dt/bindings / PM/Domains: Update binding for PM domain idle states PM / Domains: Save the fwnode in genpd_power_state PM / Domains: Allow domain power states to be read from DT PM / Domains: Add residency property to genpd states PM / Domains: Make genpd state allocation dynamic Conflicts: arch/arm/mach-imx/gpc.chifive-unleashed-5.1
Rafael J. Wysocki
commit
cc773e75a0
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@ -0,0 +1,33 @@
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PM Domain Idle State Node:
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A domain idle state node represents the state parameters that will be used to
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select the state when there are no active components in the domain.
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The state node has the following parameters -
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- compatible:
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Usage: Required
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Value type: <string>
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Definition: Must be "domain-idle-state".
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- entry-latency-us
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Usage: Required
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Value type: <prop-encoded-array>
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Definition: u32 value representing worst case latency in
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microseconds required to enter the idle state.
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The exit-latency-us duration may be guaranteed
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only after entry-latency-us has passed.
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- exit-latency-us
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Usage: Required
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Value type: <prop-encoded-array>
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Definition: u32 value representing worst case latency
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in microseconds required to exit the idle state.
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- min-residency-us
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Usage: Required
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Value type: <prop-encoded-array>
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Definition: u32 value representing minimum residency duration
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in microseconds after which the idle state will yield
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power benefits after overcoming the overhead in entering
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i the idle state.
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@ -29,6 +29,15 @@ Optional properties:
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specified by this binding. More details about power domain specifier are
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available in the next section.
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- domain-idle-states : A phandle of an idle-state that shall be soaked into a
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generic domain power state. The idle state definitions are
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compatible with domain-idle-state specified in [1].
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The domain-idle-state property reflects the idle state of this PM domain and
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not the idle states of the devices or sub-domains in the PM domain. Devices
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and sub-domains have their own idle-states independent of the parent
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domain's idle states. In the absence of this property, the domain would be
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considered as capable of being powered-on or powered-off.
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Example:
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power: power-controller@12340000 {
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@ -59,6 +68,38 @@ The nodes above define two power controllers: 'parent' and 'child'.
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Domains created by the 'child' power controller are subdomains of '0' power
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domain provided by the 'parent' power controller.
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Example 3:
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parent: power-controller@12340000 {
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compatible = "foo,power-controller";
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reg = <0x12340000 0x1000>;
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#power-domain-cells = <0>;
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domain-idle-states = <&DOMAIN_RET>, <&DOMAIN_PWR_DN>;
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};
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child: power-controller@12341000 {
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compatible = "foo,power-controller";
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reg = <0x12341000 0x1000>;
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power-domains = <&parent 0>;
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#power-domain-cells = <0>;
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domain-idle-states = <&DOMAIN_PWR_DN>;
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};
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DOMAIN_RET: state@0 {
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compatible = "domain-idle-state";
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reg = <0x0>;
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entry-latency-us = <1000>;
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exit-latency-us = <2000>;
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min-residency-us = <10000>;
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};
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DOMAIN_PWR_DN: state@1 {
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compatible = "domain-idle-state";
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reg = <0x1>;
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entry-latency-us = <5000>;
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exit-latency-us = <8000>;
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min-residency-us = <7000>;
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};
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==PM domain consumers==
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Required properties:
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@ -76,3 +117,5 @@ Example:
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The node above defines a typical PM domain consumer device, which is located
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inside a PM domain with index 0 of a power controller represented by a node
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with the label "power".
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[1]. Documentation/devicetree/bindings/power/domain-idle-state.txt
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@ -607,7 +607,9 @@ individually. Instead, a set of devices sharing a power resource can be put
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into a low-power state together at the same time by turning off the shared
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power resource. Of course, they also need to be put into the full-power state
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together, by turning the shared power resource on. A set of devices with this
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property is often referred to as a power domain.
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property is often referred to as a power domain. A power domain may also be
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nested inside another power domain. The nested domain is referred to as the
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sub-domain of the parent domain.
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Support for power domains is provided through the pm_domain field of struct
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device. This field is a pointer to an object of type struct dev_pm_domain,
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@ -629,6 +631,16 @@ support for power domains into subsystem-level callbacks, for example by
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modifying the platform bus type. Other platforms need not implement it or take
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it into account in any way.
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Devices may be defined as IRQ-safe which indicates to the PM core that their
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runtime PM callbacks may be invoked with disabled interrupts (see
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Documentation/power/runtime_pm.txt for more information). If an IRQ-safe
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device belongs to a PM domain, the runtime PM of the domain will be
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disallowed, unless the domain itself is defined as IRQ-safe. However, it
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makes sense to define a PM domain as IRQ-safe only if all the devices in it
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are IRQ-safe. Moreover, if an IRQ-safe domain has a parent domain, the runtime
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PM of the parent is only allowed if the parent itself is IRQ-safe too with the
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additional restriction that all child domains of an IRQ-safe parent must also
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be IRQ-safe.
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Device Low Power (suspend) States
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---------------------------------
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@ -380,13 +380,6 @@ static struct pu_domain imx6q_pu_domain = {
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.name = "PU",
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.power_off = imx6q_pm_pu_power_off,
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.power_on = imx6q_pm_pu_power_on,
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.states = {
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[0] = {
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.power_off_latency_ns = 25000,
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.power_on_latency_ns = 2000000,
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},
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},
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.state_count = 1,
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},
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};
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@ -430,6 +423,16 @@ static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
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if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
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return 0;
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imx6q_pu_domain.base.states = devm_kzalloc(dev,
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sizeof(*imx6q_pu_domain.base.states),
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GFP_KERNEL);
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if (!imx6q_pu_domain.base.states)
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return -ENOMEM;
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imx6q_pu_domain.base.states[0].power_off_latency_ns = 25000;
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imx6q_pu_domain.base.states[0].power_on_latency_ns = 2000000;
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imx6q_pu_domain.base.state_count = 1;
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for (i = 0; i < ARRAY_SIZE(imx_gpc_domains); i++)
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pm_genpd_init(imx_gpc_domains[i], NULL, false);
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@ -39,6 +39,105 @@
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static LIST_HEAD(gpd_list);
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static DEFINE_MUTEX(gpd_list_lock);
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struct genpd_lock_ops {
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void (*lock)(struct generic_pm_domain *genpd);
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void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
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int (*lock_interruptible)(struct generic_pm_domain *genpd);
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void (*unlock)(struct generic_pm_domain *genpd);
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};
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static void genpd_lock_mtx(struct generic_pm_domain *genpd)
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{
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mutex_lock(&genpd->mlock);
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}
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static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
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int depth)
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{
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mutex_lock_nested(&genpd->mlock, depth);
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}
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static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
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{
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return mutex_lock_interruptible(&genpd->mlock);
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}
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static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
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{
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return mutex_unlock(&genpd->mlock);
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}
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static const struct genpd_lock_ops genpd_mtx_ops = {
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.lock = genpd_lock_mtx,
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.lock_nested = genpd_lock_nested_mtx,
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.lock_interruptible = genpd_lock_interruptible_mtx,
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.unlock = genpd_unlock_mtx,
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};
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static void genpd_lock_spin(struct generic_pm_domain *genpd)
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__acquires(&genpd->slock)
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{
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unsigned long flags;
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spin_lock_irqsave(&genpd->slock, flags);
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genpd->lock_flags = flags;
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}
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static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
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int depth)
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__acquires(&genpd->slock)
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{
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unsigned long flags;
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spin_lock_irqsave_nested(&genpd->slock, flags, depth);
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genpd->lock_flags = flags;
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}
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static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
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__acquires(&genpd->slock)
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{
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unsigned long flags;
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spin_lock_irqsave(&genpd->slock, flags);
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genpd->lock_flags = flags;
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return 0;
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}
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static void genpd_unlock_spin(struct generic_pm_domain *genpd)
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__releases(&genpd->slock)
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{
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spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
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}
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static const struct genpd_lock_ops genpd_spin_ops = {
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.lock = genpd_lock_spin,
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.lock_nested = genpd_lock_nested_spin,
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.lock_interruptible = genpd_lock_interruptible_spin,
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.unlock = genpd_unlock_spin,
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};
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#define genpd_lock(p) p->lock_ops->lock(p)
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#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
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#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
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#define genpd_unlock(p) p->lock_ops->unlock(p)
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#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
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static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
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struct generic_pm_domain *genpd)
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{
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bool ret;
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ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
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/* Warn once for each IRQ safe dev in no sleep domain */
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if (ret)
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dev_warn_once(dev, "PM domain %s will not be powered off\n",
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genpd->name);
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return ret;
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}
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/*
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* Get the generic PM domain for a particular struct device.
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* This validates the struct device pointer, the PM domain pointer,
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@ -200,9 +299,9 @@ static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
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genpd_sd_counter_inc(master);
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mutex_lock_nested(&master->lock, depth + 1);
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genpd_lock_nested(master, depth + 1);
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ret = genpd_poweron(master, depth + 1);
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mutex_unlock(&master->lock);
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genpd_unlock(master);
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if (ret) {
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genpd_sd_counter_dec(master);
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@ -255,9 +354,9 @@ static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
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spin_unlock_irq(&dev->power.lock);
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if (!IS_ERR(genpd)) {
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mutex_lock(&genpd->lock);
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genpd_lock(genpd);
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genpd->max_off_time_changed = true;
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mutex_unlock(&genpd->lock);
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genpd_unlock(genpd);
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}
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dev = dev->parent;
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@ -303,7 +402,12 @@ static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
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if (stat > PM_QOS_FLAGS_NONE)
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return -EBUSY;
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if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
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/*
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* Do not allow PM domain to be powered off, when an IRQ safe
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* device is part of a non-IRQ safe domain.
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*/
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if (!pm_runtime_suspended(pdd->dev) ||
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irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
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not_suspended++;
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}
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@ -354,9 +458,9 @@ static void genpd_power_off_work_fn(struct work_struct *work)
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genpd = container_of(work, struct generic_pm_domain, power_off_work);
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mutex_lock(&genpd->lock);
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genpd_lock(genpd);
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genpd_poweroff(genpd, true);
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mutex_unlock(&genpd->lock);
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genpd_unlock(genpd);
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}
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/**
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@ -466,15 +570,15 @@ static int genpd_runtime_suspend(struct device *dev)
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}
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/*
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* If power.irq_safe is set, this routine will be run with interrupts
|
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* off, so it can't use mutexes.
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* If power.irq_safe is set, this routine may be run with
|
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* IRQs disabled, so suspend only if the PM domain also is irq_safe.
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*/
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if (dev->power.irq_safe)
|
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if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
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return 0;
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mutex_lock(&genpd->lock);
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genpd_lock(genpd);
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genpd_poweroff(genpd, false);
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mutex_unlock(&genpd->lock);
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genpd_unlock(genpd);
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return 0;
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}
|
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|
|
@ -503,15 +607,18 @@ static int genpd_runtime_resume(struct device *dev)
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if (IS_ERR(genpd))
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return -EINVAL;
|
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|
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/* If power.irq_safe, the PM domain is never powered off. */
|
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if (dev->power.irq_safe) {
|
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/*
|
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* As we don't power off a non IRQ safe domain, which holds
|
||||
* an IRQ safe device, we don't need to restore power to it.
|
||||
*/
|
||||
if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) {
|
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timed = false;
|
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goto out;
|
||||
}
|
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|
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mutex_lock(&genpd->lock);
|
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genpd_lock(genpd);
|
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ret = genpd_poweron(genpd, 0);
|
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mutex_unlock(&genpd->lock);
|
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genpd_unlock(genpd);
|
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|
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if (ret)
|
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return ret;
|
||||
|
|
@ -546,10 +653,11 @@ static int genpd_runtime_resume(struct device *dev)
|
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err_stop:
|
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genpd_stop_dev(genpd, dev);
|
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err_poweroff:
|
||||
if (!dev->power.irq_safe) {
|
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mutex_lock(&genpd->lock);
|
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if (!pm_runtime_is_irq_safe(dev) ||
|
||||
(pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
|
||||
genpd_lock(genpd);
|
||||
genpd_poweroff(genpd, 0);
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
}
|
||||
|
||||
return ret;
|
||||
|
|
@ -732,20 +840,20 @@ static int pm_genpd_prepare(struct device *dev)
|
|||
if (resume_needed(dev, genpd))
|
||||
pm_runtime_resume(dev);
|
||||
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
if (genpd->prepared_count++ == 0)
|
||||
genpd->suspended_count = 0;
|
||||
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
|
||||
ret = pm_generic_prepare(dev);
|
||||
if (ret) {
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
genpd->prepared_count--;
|
||||
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
}
|
||||
|
||||
return ret;
|
||||
|
|
@ -936,13 +1044,13 @@ static void pm_genpd_complete(struct device *dev)
|
|||
|
||||
pm_generic_complete(dev);
|
||||
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
genpd->prepared_count--;
|
||||
if (!genpd->prepared_count)
|
||||
genpd_queue_power_off_work(genpd);
|
||||
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -1071,7 +1179,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
|
|||
if (IS_ERR(gpd_data))
|
||||
return PTR_ERR(gpd_data);
|
||||
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
if (genpd->prepared_count > 0) {
|
||||
ret = -EAGAIN;
|
||||
|
|
@ -1088,7 +1196,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
|
|||
list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
|
||||
|
||||
out:
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
|
||||
if (ret)
|
||||
genpd_free_dev_data(dev, gpd_data);
|
||||
|
|
@ -1130,7 +1238,7 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
|
|||
gpd_data = to_gpd_data(pdd);
|
||||
dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
|
||||
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
if (genpd->prepared_count > 0) {
|
||||
ret = -EAGAIN;
|
||||
|
|
@ -1145,14 +1253,14 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
|
|||
|
||||
list_del_init(&pdd->list_node);
|
||||
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
|
||||
genpd_free_dev_data(dev, gpd_data);
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
dev_pm_qos_add_notifier(dev, &gpd_data->nb);
|
||||
|
||||
return ret;
|
||||
|
|
@ -1183,12 +1291,23 @@ static int genpd_add_subdomain(struct generic_pm_domain *genpd,
|
|||
|| genpd == subdomain)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* If the domain can be powered on/off in an IRQ safe
|
||||
* context, ensure that the subdomain can also be
|
||||
* powered on/off in that context.
|
||||
*/
|
||||
if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
|
||||
WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
|
||||
genpd->name, subdomain->name);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
link = kzalloc(sizeof(*link), GFP_KERNEL);
|
||||
if (!link)
|
||||
return -ENOMEM;
|
||||
|
||||
mutex_lock(&subdomain->lock);
|
||||
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
|
||||
genpd_lock(subdomain);
|
||||
genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
|
||||
|
||||
if (genpd->status == GPD_STATE_POWER_OFF
|
||||
&& subdomain->status != GPD_STATE_POWER_OFF) {
|
||||
|
|
@ -1211,8 +1330,8 @@ static int genpd_add_subdomain(struct generic_pm_domain *genpd,
|
|||
genpd_sd_counter_inc(genpd);
|
||||
|
||||
out:
|
||||
mutex_unlock(&genpd->lock);
|
||||
mutex_unlock(&subdomain->lock);
|
||||
genpd_unlock(genpd);
|
||||
genpd_unlock(subdomain);
|
||||
if (ret)
|
||||
kfree(link);
|
||||
return ret;
|
||||
|
|
@ -1250,8 +1369,8 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
|
|||
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&subdomain->lock);
|
||||
mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
|
||||
genpd_lock(subdomain);
|
||||
genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
|
||||
|
||||
if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
|
||||
pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
|
||||
|
|
@ -1275,13 +1394,39 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
|
|||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&genpd->lock);
|
||||
mutex_unlock(&subdomain->lock);
|
||||
genpd_unlock(genpd);
|
||||
genpd_unlock(subdomain);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
|
||||
|
||||
static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
|
||||
{
|
||||
struct genpd_power_state *state;
|
||||
|
||||
state = kzalloc(sizeof(*state), GFP_KERNEL);
|
||||
if (!state)
|
||||
return -ENOMEM;
|
||||
|
||||
genpd->states = state;
|
||||
genpd->state_count = 1;
|
||||
genpd->free = state;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void genpd_lock_init(struct generic_pm_domain *genpd)
|
||||
{
|
||||
if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
|
||||
spin_lock_init(&genpd->slock);
|
||||
genpd->lock_ops = &genpd_spin_ops;
|
||||
} else {
|
||||
mutex_init(&genpd->mlock);
|
||||
genpd->lock_ops = &genpd_mtx_ops;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* pm_genpd_init - Initialize a generic I/O PM domain object.
|
||||
* @genpd: PM domain object to initialize.
|
||||
|
|
@ -1293,13 +1438,15 @@ EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
|
|||
int pm_genpd_init(struct generic_pm_domain *genpd,
|
||||
struct dev_power_governor *gov, bool is_off)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (IS_ERR_OR_NULL(genpd))
|
||||
return -EINVAL;
|
||||
|
||||
INIT_LIST_HEAD(&genpd->master_links);
|
||||
INIT_LIST_HEAD(&genpd->slave_links);
|
||||
INIT_LIST_HEAD(&genpd->dev_list);
|
||||
mutex_init(&genpd->lock);
|
||||
genpd_lock_init(genpd);
|
||||
genpd->gov = gov;
|
||||
INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
|
||||
atomic_set(&genpd->sd_count, 0);
|
||||
|
|
@ -1325,19 +1472,12 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
|
|||
genpd->dev_ops.start = pm_clk_resume;
|
||||
}
|
||||
|
||||
if (genpd->state_idx >= GENPD_MAX_NUM_STATES) {
|
||||
pr_warn("Initial state index out of bounds.\n");
|
||||
genpd->state_idx = GENPD_MAX_NUM_STATES - 1;
|
||||
}
|
||||
|
||||
if (genpd->state_count > GENPD_MAX_NUM_STATES) {
|
||||
pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES);
|
||||
genpd->state_count = GENPD_MAX_NUM_STATES;
|
||||
}
|
||||
|
||||
/* Use only one "off" state if there were no states declared */
|
||||
if (genpd->state_count == 0)
|
||||
genpd->state_count = 1;
|
||||
if (genpd->state_count == 0) {
|
||||
ret = genpd_set_default_power_state(genpd);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
mutex_lock(&gpd_list_lock);
|
||||
list_add(&genpd->gpd_list_node, &gpd_list);
|
||||
|
|
@ -1354,16 +1494,16 @@ static int genpd_remove(struct generic_pm_domain *genpd)
|
|||
if (IS_ERR_OR_NULL(genpd))
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&genpd->lock);
|
||||
genpd_lock(genpd);
|
||||
|
||||
if (genpd->has_provider) {
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
pr_err("Provider present, unable to remove %s\n", genpd->name);
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
if (!list_empty(&genpd->master_links) || genpd->device_count) {
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
pr_err("%s: unable to remove %s\n", __func__, genpd->name);
|
||||
return -EBUSY;
|
||||
}
|
||||
|
|
@ -1375,8 +1515,9 @@ static int genpd_remove(struct generic_pm_domain *genpd)
|
|||
}
|
||||
|
||||
list_del(&genpd->gpd_list_node);
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
cancel_work_sync(&genpd->power_off_work);
|
||||
kfree(genpd->free);
|
||||
pr_debug("%s: removed %s\n", __func__, genpd->name);
|
||||
|
||||
return 0;
|
||||
|
|
@ -1890,21 +2031,117 @@ int genpd_dev_pm_attach(struct device *dev)
|
|||
mutex_unlock(&gpd_list_lock);
|
||||
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "failed to add to PM domain %s: %d",
|
||||
pd->name, ret);
|
||||
if (ret != -EPROBE_DEFER)
|
||||
dev_err(dev, "failed to add to PM domain %s: %d",
|
||||
pd->name, ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
dev->pm_domain->detach = genpd_dev_pm_detach;
|
||||
dev->pm_domain->sync = genpd_dev_pm_sync;
|
||||
|
||||
mutex_lock(&pd->lock);
|
||||
genpd_lock(pd);
|
||||
ret = genpd_poweron(pd, 0);
|
||||
mutex_unlock(&pd->lock);
|
||||
genpd_unlock(pd);
|
||||
out:
|
||||
return ret ? -EPROBE_DEFER : 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
|
||||
|
||||
static const struct of_device_id idle_state_match[] = {
|
||||
{ .compatible = "domain-idle-state", },
|
||||
{ }
|
||||
};
|
||||
|
||||
static int genpd_parse_state(struct genpd_power_state *genpd_state,
|
||||
struct device_node *state_node)
|
||||
{
|
||||
int err;
|
||||
u32 residency;
|
||||
u32 entry_latency, exit_latency;
|
||||
const struct of_device_id *match_id;
|
||||
|
||||
match_id = of_match_node(idle_state_match, state_node);
|
||||
if (!match_id)
|
||||
return -EINVAL;
|
||||
|
||||
err = of_property_read_u32(state_node, "entry-latency-us",
|
||||
&entry_latency);
|
||||
if (err) {
|
||||
pr_debug(" * %s missing entry-latency-us property\n",
|
||||
state_node->full_name);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
err = of_property_read_u32(state_node, "exit-latency-us",
|
||||
&exit_latency);
|
||||
if (err) {
|
||||
pr_debug(" * %s missing exit-latency-us property\n",
|
||||
state_node->full_name);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
err = of_property_read_u32(state_node, "min-residency-us", &residency);
|
||||
if (!err)
|
||||
genpd_state->residency_ns = 1000 * residency;
|
||||
|
||||
genpd_state->power_on_latency_ns = 1000 * exit_latency;
|
||||
genpd_state->power_off_latency_ns = 1000 * entry_latency;
|
||||
genpd_state->fwnode = &state_node->fwnode;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* of_genpd_parse_idle_states: Return array of idle states for the genpd.
|
||||
*
|
||||
* @dn: The genpd device node
|
||||
* @states: The pointer to which the state array will be saved.
|
||||
* @n: The count of elements in the array returned from this function.
|
||||
*
|
||||
* Returns the device states parsed from the OF node. The memory for the states
|
||||
* is allocated by this function and is the responsibility of the caller to
|
||||
* free the memory after use.
|
||||
*/
|
||||
int of_genpd_parse_idle_states(struct device_node *dn,
|
||||
struct genpd_power_state **states, int *n)
|
||||
{
|
||||
struct genpd_power_state *st;
|
||||
struct device_node *np;
|
||||
int i = 0;
|
||||
int err, ret;
|
||||
int count;
|
||||
struct of_phandle_iterator it;
|
||||
|
||||
count = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
|
||||
if (count <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
st = kcalloc(count, sizeof(*st), GFP_KERNEL);
|
||||
if (!st)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Loop over the phandles until all the requested entry is found */
|
||||
of_for_each_phandle(&it, err, dn, "domain-idle-states", NULL, 0) {
|
||||
np = it.node;
|
||||
ret = genpd_parse_state(&st[i++], np);
|
||||
if (ret) {
|
||||
pr_err
|
||||
("Parsing idle state node %s failed with err %d\n",
|
||||
np->full_name, ret);
|
||||
of_node_put(np);
|
||||
kfree(st);
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
|
||||
*n = count;
|
||||
*states = st;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
|
||||
|
||||
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
|
||||
|
||||
|
||||
|
|
@ -1958,7 +2195,7 @@ static int pm_genpd_summary_one(struct seq_file *s,
|
|||
char state[16];
|
||||
int ret;
|
||||
|
||||
ret = mutex_lock_interruptible(&genpd->lock);
|
||||
ret = genpd_lock_interruptible(genpd);
|
||||
if (ret)
|
||||
return -ERESTARTSYS;
|
||||
|
||||
|
|
@ -1984,7 +2221,9 @@ static int pm_genpd_summary_one(struct seq_file *s,
|
|||
}
|
||||
|
||||
list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
|
||||
kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
|
||||
kobj_path = kobject_get_path(&pm_data->dev->kobj,
|
||||
genpd_is_irq_safe(genpd) ?
|
||||
GFP_ATOMIC : GFP_KERNEL);
|
||||
if (kobj_path == NULL)
|
||||
continue;
|
||||
|
||||
|
|
@ -1995,7 +2234,7 @@ static int pm_genpd_summary_one(struct seq_file *s,
|
|||
|
||||
seq_puts(s, "\n");
|
||||
exit:
|
||||
mutex_unlock(&genpd->lock);
|
||||
genpd_unlock(genpd);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -15,11 +15,11 @@
|
|||
#include <linux/err.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/spinlock.h>
|
||||
|
||||
/* Defines used for the flags field in the struct generic_pm_domain */
|
||||
#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
|
||||
|
||||
#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */
|
||||
#define GENPD_FLAG_IRQ_SAFE (1U << 1) /* PM domain operates in atomic */
|
||||
|
||||
enum gpd_status {
|
||||
GPD_STATE_ACTIVE = 0, /* PM domain is active */
|
||||
|
|
@ -40,15 +40,18 @@ struct gpd_dev_ops {
|
|||
struct genpd_power_state {
|
||||
s64 power_off_latency_ns;
|
||||
s64 power_on_latency_ns;
|
||||
s64 residency_ns;
|
||||
struct fwnode_handle *fwnode;
|
||||
};
|
||||
|
||||
struct genpd_lock_ops;
|
||||
|
||||
struct generic_pm_domain {
|
||||
struct dev_pm_domain domain; /* PM domain operations */
|
||||
struct list_head gpd_list_node; /* Node in the global PM domains list */
|
||||
struct list_head master_links; /* Links with PM domain as a master */
|
||||
struct list_head slave_links; /* Links with PM domain as a slave */
|
||||
struct list_head dev_list; /* List of devices */
|
||||
struct mutex lock;
|
||||
struct dev_power_governor *gov;
|
||||
struct work_struct power_off_work;
|
||||
struct fwnode_handle *provider; /* Identity of the domain provider */
|
||||
|
|
@ -70,9 +73,18 @@ struct generic_pm_domain {
|
|||
void (*detach_dev)(struct generic_pm_domain *domain,
|
||||
struct device *dev);
|
||||
unsigned int flags; /* Bit field of configs for genpd */
|
||||
struct genpd_power_state states[GENPD_MAX_NUM_STATES];
|
||||
struct genpd_power_state *states;
|
||||
unsigned int state_count; /* number of states */
|
||||
unsigned int state_idx; /* state that genpd will go to when off */
|
||||
void *free; /* Free the state that was allocated for default */
|
||||
const struct genpd_lock_ops *lock_ops;
|
||||
union {
|
||||
struct mutex mlock;
|
||||
struct {
|
||||
spinlock_t slock;
|
||||
unsigned long lock_flags;
|
||||
};
|
||||
};
|
||||
|
||||
};
|
||||
|
||||
|
|
@ -205,6 +217,8 @@ extern int of_genpd_add_device(struct of_phandle_args *args,
|
|||
extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
|
||||
struct of_phandle_args *new_subdomain);
|
||||
extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
|
||||
extern int of_genpd_parse_idle_states(struct device_node *dn,
|
||||
struct genpd_power_state **states, int *n);
|
||||
|
||||
int genpd_dev_pm_attach(struct device *dev);
|
||||
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
|
||||
|
|
@ -234,6 +248,12 @@ static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
|
|||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int of_genpd_parse_idle_states(struct device_node *dn,
|
||||
struct genpd_power_state **states, int *n)
|
||||
{
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
static inline int genpd_dev_pm_attach(struct device *dev)
|
||||
{
|
||||
return -ENODEV;
|
||||
|
|
|
|||
Loading…
Reference in New Issue