[PATCH v2] PM / suspend: Add suspend_target_state()
From: f.fainelli@gmail.com (Florian Fainelli)
Date: 2017-07-17 20:06:35
Also in:
linux-pm, lkml
Subsystem:
hibernation (aka software suspend, aka swsusp), suspend to ram, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
Have the core suspend/resume framework store the system-wide suspend state (suspend_state_t) we are about to enter, and expose it to drivers via suspend_target_state() in order to retrieve that. The state is assigned in suspend_devices_and_enter(). This is useful for platform specific drivers that may need to take a slightly different suspend/resume path based on the system's suspend/resume state being entered. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> --- Changes in v2: - rename platform_suspend_target_state() -> suspend_target_state() - directly export the suspend_state_t value and assign it in suspend_devices_and_enter() include/linux/suspend.h | 2 ++ kernel/power/suspend.c | 15 +++++++++++++++ 2 files changed, 17 insertions(+)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 0b1cf32edfd7..7b70e7d6a006 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h@@ -202,6 +202,7 @@ struct platform_freeze_ops { */ extern void suspend_set_ops(const struct platform_suspend_ops *ops); extern int suspend_valid_only_mem(suspend_state_t state); +extern suspend_state_t suspend_target_state(void); extern unsigned int pm_suspend_global_flags;
@@ -281,6 +282,7 @@ static inline bool pm_resume_via_firmware(void) { return false; } static inline void suspend_set_ops(const struct platform_suspend_ops *ops) {} static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } +static inline suspend_state_t suspend_target_state(void) { return -ENOSYS; } static inline bool idle_should_freeze(void) { return false; } static inline void __init pm_states_init(void) {} static inline void freeze_set_ops(const struct platform_freeze_ops *ops) {}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 3ecf275d7e44..a296d6e25d52 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c@@ -47,6 +47,7 @@ const char *mem_sleep_states[PM_SUSPEND_MAX]; suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE; static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM; +static suspend_state_t pm_suspend_target_state; unsigned int pm_suspend_global_flags; EXPORT_SYMBOL_GPL(pm_suspend_global_flags);
@@ -202,6 +203,18 @@ void suspend_set_ops(const struct platform_suspend_ops *ops) EXPORT_SYMBOL_GPL(suspend_set_ops); /** + * suspend_target_state - Return the system wide suspend state. + * + * The pm_suspend_target_state becomes valid during + * suspend_devices_and_enter(). + */ +suspend_state_t suspend_target_state(void) +{ + return pm_suspend_target_state; +} +EXPORT_SYMBOL_GPL(suspend_target_state); + +/** * suspend_valid_only_mem - Generic memory-only valid callback. * * Platform drivers that implement mem suspend only and only need to check for
@@ -456,6 +469,8 @@ int suspend_devices_and_enter(suspend_state_t state) if (!sleep_state_supported(state)) return -ENOSYS; + pm_suspend_target_state = state; + error = platform_suspend_begin(state); if (error) goto Close;
--
2.9.3