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PM: wakeup: Add out-of-band system wakeup support for devices

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Some devices can wake up the system from suspend even when their power
domains are turned off. This is possible because their system-wakeup logic
resides in an always-on power domain - indicating that they support
out-of-band system wakeup.

Currently, PM domain core doesn't power off such devices if they are marked
as system wakeup sources. To better represent devices with out-of-band
wakeup capability, this patch introduces a new flag out_band_wakeup in
'struct dev_pm_info'.

Two helper APIs are added:
 - device_set_out_band_wakeup() - to mark a device as having out-of-band
   wakeup capability.
 - device_out_band_wakeup() - to query the flag.

Allow the PM core and drivers to distinguish between regular and
out-of-band wakeup sources, enable more accurate power management decision.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peng Fan
2025-09-22 10:21:06 +08:00
committed by Ulf Hansson
parent 35cfef3ccb
commit 4acbfb6c11
3 changed files with 19 additions and 0 deletions
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1
drivers/base/power/main.c
View File

@@ -2126,6 +2126,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
device_lock(dev);
dev->power.wakeup_path = false;
dev->power.out_band_wakeup = false;
if (dev->power.no_pm_callbacks)
goto unlock;

1
include/linux/pm.h
View File

@@ -684,6 +684,7 @@ struct dev_pm_info {
bool smart_suspend:1; /* Owned by the PM core */
bool must_resume:1; /* Owned by the PM core */
bool may_skip_resume:1; /* Set by subsystems */
bool out_band_wakeup:1;
bool strict_midlayer:1;
#else
bool should_wakeup:1;

17
include/linux/pm_wakeup.h
View File

@@ -94,6 +94,16 @@ static inline void device_set_wakeup_path(struct device *dev)
dev->power.wakeup_path = true;
}
static inline void device_set_out_band_wakeup(struct device *dev)
{
dev->power.out_band_wakeup = true;
}
static inline bool device_out_band_wakeup(struct device *dev)
{
return dev->power.out_band_wakeup;
}
/* drivers/base/power/wakeup.c */
extern struct wakeup_source *wakeup_source_register(struct device *dev,
const char *name);
@@ -162,6 +172,13 @@ static inline bool device_wakeup_path(struct device *dev)
static inline void device_set_wakeup_path(struct device *dev) {}
static inline void device_set_out_band_wakeup(struct device *dev) {}
static inline bool device_out_band_wakeup(struct device *dev)
{
return false;
}
static inline void __pm_stay_awake(struct wakeup_source *ws) {}
static inline void pm_stay_awake(struct device *dev) {}