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pmdomain: core: introduce dev_pm_genpd_is_on()

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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>
This commit is contained in:
Hiago De Franco 2025-06-29 14:25:10 -03:00 • committed by Ulf Hansson
parent fcddcb7e8f
commit 09813cde37
2 changed files with 39 additions and 0 deletions
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33
drivers/pmdomain/core.c
View file

@ -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.
*

6
include/linux/pm_domain.h
View file

@ -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