[PATCH v2 1/3] pmdomain: core: Introduce device_set/get_out_band_wakeup()
From: Peng Fan <peng.fan@nxp.com>
Date: 2025-08-01 04:34:57
Also in:
arm-scmi, imx, linux-pm, linux-usb, lkml
Subsystem:
generic pm domains, hibernation (aka software suspend, aka swsusp), power management core, suspend to ram, the rest · Maintainers:
Ulf Hansson, "Rafael J. Wysocki", Linus Torvalds
For some cases, a device could still wakeup the system even if its power domain is in off state, because the device's wakeup hardware logic is in an always-on domain. To support this case, introduce device_set/get_out_band_wakeup() to allow device drivers to control the behaviour in genpd for a device that is attached to it. Signed-off-by: Peng Fan <peng.fan@nxp.com> --- drivers/pmdomain/core.c | 6 ++++-- include/linux/pm.h | 1 + include/linux/pm_wakeup.h | 17 +++++++++++++++++ 3 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
index 0006ab3d078972cc72a6dd22a2144fb31443e3da..8e37758cea88a9ee051ad9fb13bdd3feb4f8745e 100644
--- a/drivers/pmdomain/core.c
+++ b/drivers/pmdomain/core.c@@ -1549,7 +1549,8 @@ static int genpd_finish_suspend(struct device *dev, if (ret) return ret; - if (device_awake_path(dev) && genpd_is_active_wakeup(genpd)) + if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) && + !device_get_out_band_wakeup(dev)) return 0; if (genpd->dev_ops.stop && genpd->dev_ops.start &&
@@ -1604,7 +1605,8 @@ static int genpd_finish_resume(struct device *dev, if (IS_ERR(genpd)) return -EINVAL; - if (device_awake_path(dev) && genpd_is_active_wakeup(genpd)) + if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) && + !device_get_out_band_wakeup(dev)) return resume_noirq(dev); genpd_lock(genpd);
diff --git a/include/linux/pm.h b/include/linux/pm.h
index cc7b2dc28574c24ece2f651352d4d23ecaf15f31..5b28a4f2e87e2aa34acc709e146ce729acace344 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 c838b4a30f876ef5a66972d16f461cfba9ff2814..c461c7edef6f7927d696b7d18b59a6a1147f53a3 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, bool capable) +{ + dev->power.out_band_wakeup = capable; +} + +static inline bool device_get_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, bool capable) {} + +static inline bool device_get_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) {}
--
2.37.1