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| author |   Hiago De Franco <hiago.franco@toradex.com> | 2025-06-29 14:25:10 -0300 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2025-07-16 20:54:27 +0200 |
| commit | 09813cde376d9d8f30eaf761534532101a0a7755 (patch) | |
| tree | 2de0ea0f93736410f69bff657d52e2791e806720 | |
| parent | pmdomain: ti: Select PM_GENERIC_DOMAINS (diff) | |
| download | wireguard-linux-09813cde376d9d8f30eaf761534532101a0a7755.tar.xz wireguard-linux-09813cde376d9d8f30eaf761534532101a0a7755.zip | |
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 <ulf.hansson@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Link: https://lore.kernel.org/r/20250629172512.14857-2-hiagofranco@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/pmdomain/core.c | 33 | ||||
| -rw-r--r-- | include/linux/pm_domain.h | 6 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index a86aeda1c955..0006ab3d0789 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -770,6 +770,39 @@ 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. * * @genpd: The PM domain the idle-state belongs to. diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 99556589f45e..b9d3c7d5c4f8 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 |