From 09813cde376d9d8f30eaf761534532101a0a7755 Mon Sep 17 00:00:00 2001 From: Hiago De Franco Date: Sun, 29 Jun 2025 14:25:10 -0300 Subject: [PATCH] pmdomain: core: introduce dev_pm_genpd_is_on() This helper function returns the current power status of a given generic power domain. As example, remoteproc/imx_rproc.c can now use this function to check the power status of the remote core to properly set "attached" or "offline" modes. Suggested-by: Ulf Hansson Reviewed-by: Bjorn Andersson Reviewed-by: Peng Fan Signed-off-by: Hiago De Franco Link: https://lore.kernel.org/r/20250629172512.14857-2-hiagofranco@gmail.com Signed-off-by: Ulf Hansson --- drivers/pmdomain/core.c | 33 +++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 6 ++++++ 2 files changed, 39 insertions(+) diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index a86aeda1c9556..0006ab3d07897 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -769,6 +769,39 @@ int dev_pm_genpd_rpm_always_on(struct device *dev, bool on) } EXPORT_SYMBOL_GPL(dev_pm_genpd_rpm_always_on); +/** + * dev_pm_genpd_is_on() - Get device's current power domain status + * + * @dev: Device to get the current power status + * + * This function checks whether the generic power domain associated with the + * given device is on or not by verifying if genpd_status_on equals + * GENPD_STATE_ON. + * + * Note: this function returns the power status of the genpd at the time of the + * call. The power status may change after due to activity from other devices + * sharing the same genpd. Therefore, this information should not be relied for + * long-term decisions about the device power state. + * + * Return: 'true' if the device's power domain is on, 'false' otherwise. + */ +bool dev_pm_genpd_is_on(struct device *dev) +{ + struct generic_pm_domain *genpd; + bool is_on; + + genpd = dev_to_genpd_safe(dev); + if (!genpd) + return false; + + genpd_lock(genpd); + is_on = genpd_status_on(genpd); + genpd_unlock(genpd); + + return is_on; +} +EXPORT_SYMBOL_GPL(dev_pm_genpd_is_on); + /** * pm_genpd_inc_rejected() - Adjust the rejected/usage counts for an idle-state. * diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 99556589f45e8..b9d3c7d5c4f8f 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -315,6 +315,7 @@ 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); +bool dev_pm_genpd_is_on(struct device *dev); extern struct dev_power_governor simple_qos_governor; extern struct dev_power_governor pm_domain_always_on_gov; @@ -407,6 +408,11 @@ static inline int dev_pm_genpd_rpm_always_on(struct device *dev, bool on) return -EOPNOTSUPP; } +static inline bool dev_pm_genpd_is_on(struct device *dev) +{ + return false; +} + #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) #endif -- 2.47.2