diff options
| author | Peng Fan <peng.fan@nxp.com> | 2025-09-22 10:21:06 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2025-11-19 18:06:49 +0100 |
| commit | 4acbfb6c116be5989d5a0e38a48deca2d5b8bb92 (patch) | |
| tree | 46d78758af8f2f21feaf46406d4ab174c294b40e | |
| parent | 35cfef3ccb8654489d0b962260e8bbdb4b2665e0 (diff) | |
PM: wakeup: Add out-of-band system wakeup support for devices
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>
| -rw-r--r-- | drivers/base/power/main.c | 1 | ||||
| -rw-r--r-- | include/linux/pm.h | 1 | ||||
| -rw-r--r-- | include/linux/pm_wakeup.h | 17 |
3 files changed, 19 insertions, 0 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index e83503bdc1fd..bcfb170baca6 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -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; diff --git a/include/linux/pm.h b/include/linux/pm.h index cc7b2dc28574..5b28a4f2e87e 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -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; diff --git a/include/linux/pm_wakeup.h b/include/linux/pm_wakeup.h index c838b4a30f87..41e8f344a205 100644 --- a/include/linux/pm_wakeup.h +++ b/include/linux/pm_wakeup.h @@ -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) {} |