Commit 495c8d35 authored by Mario Limonciello (AMD)'s avatar Mario Limonciello (AMD) Committed by Rafael J. Wysocki
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PM: hibernate: Add pm_hibernation_mode_is_suspend() 



Some drivers have different flows for hibernation and suspend. If
the driver opportunistically will skip thaw() then it needs a hint
to know what is happening after the hibernate.

Introduce a new symbol pm_hibernation_mode_is_suspend() that drivers
can call to determine if suspending the system for this purpose.

Tested-by: default avatarIonut Nechita <ionut_n2001@yahoo.com>
Tested-by: default avatarKenneth Crudup <kenny@panix.com>
Acked-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarMario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 469d80a3

include/linux/suspend.h

+2 −0
Original line number Diff line number Diff line
@@ -276,6 +276,7 @@ extern void arch_suspend_enable_irqs(void); 


extern int pm_suspend(suspend_state_t state);

extern bool sync_on_suspend_enabled;

bool pm_hibernation_mode_is_suspend(void);

#else /* !CONFIG_SUSPEND */

#define suspend_valid_only_mem	NULL
@@ -288,6 +289,7 @@ static inline bool pm_suspend_via_firmware(void) { return false; } 
static inline bool pm_resume_via_firmware(void) { return false; }

static inline bool pm_suspend_no_platform(void) { return false; }

static inline bool pm_suspend_default_s2idle(void) { return false; }

static inline bool pm_hibernation_mode_is_suspend(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; }

kernel/power/hibernate.c

+11 −0
Original line number Diff line number Diff line
@@ -80,6 +80,17 @@ static const struct platform_hibernation_ops *hibernation_ops; 


static atomic_t hibernate_atomic = ATOMIC_INIT(1);



#ifdef CONFIG_SUSPEND

/**

 * pm_hibernation_mode_is_suspend - Check if hibernation has been set to suspend

 */

bool pm_hibernation_mode_is_suspend(void)

{

	return hibernation_mode == HIBERNATION_SUSPEND;

}

EXPORT_SYMBOL_GPL(pm_hibernation_mode_is_suspend);

#endif



bool hibernate_acquire(void)

{

	return atomic_add_unless(&hibernate_atomic, -1, 0);