diff options
-rw-r--r-- | drivers/pmdomain/core.c | 35 | ||||
-rw-r--r-- | include/linux/pm_domain.h | 7 |
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index 6c94137865c9..9b2f28b34bb5 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -697,6 +697,37 @@ bool dev_pm_genpd_get_hwmode(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_genpd_get_hwmode); +/** + * dev_pm_genpd_rpm_always_on() - Control if the PM domain can be powered off. + * + * @dev: Device for which the PM domain may need to stay on for. + * @on: Value to set or unset for the condition. + * + * For some usecases a consumer driver requires its device to remain power-on + * from the PM domain perspective during runtime. This function allows the + * behaviour to be dynamically controlled for a device attached to a genpd. + * + * It is assumed that the users guarantee that the genpd wouldn't be detached + * while this routine is getting called. + * + * Return: Returns 0 on success and negative error values on failures. + */ +int dev_pm_genpd_rpm_always_on(struct device *dev, bool on) +{ + struct generic_pm_domain *genpd; + + genpd = dev_to_genpd_safe(dev); + if (!genpd) + return -ENODEV; + + genpd_lock(genpd); + dev_gpd_data(dev)->rpm_always_on = on; + genpd_unlock(genpd); + + return 0; +} +EXPORT_SYMBOL_GPL(dev_pm_genpd_rpm_always_on); + static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) { unsigned int state_idx = genpd->state_idx; @@ -868,6 +899,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, if (!pm_runtime_suspended(pdd->dev) || irq_safe_dev_in_sleep_domain(pdd->dev, genpd)) not_suspended++; + + /* The device may need its PM domain to stay powered on. */ + if (to_gpd_data(pdd)->rpm_always_on) + return -EBUSY; } if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 1aab31370065..d56a78af4af1 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -261,6 +261,7 @@ struct generic_pm_domain_data { unsigned int rpm_pstate; unsigned int opp_token; bool hw_mode; + bool rpm_always_on; void *data; }; @@ -293,6 +294,7 @@ ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev); void dev_pm_genpd_synced_poweroff(struct device *dev); int dev_pm_genpd_set_hwmode(struct device *dev, bool enable); bool dev_pm_genpd_get_hwmode(struct device *dev); +int dev_pm_genpd_rpm_always_on(struct device *dev, bool on); extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor pm_domain_always_on_gov; @@ -376,6 +378,11 @@ static inline bool dev_pm_genpd_get_hwmode(struct device *dev) return false; } +static inline int dev_pm_genpd_rpm_always_on(struct device *dev, bool on) +{ + return -EOPNOTSUPP; +} + #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) #endif |