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Subject[PATCH v2 1/3] PM / Suspend: Add support to check if platform's power is off in suspend
Date
From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support to check if platform's power will be cut off in suspend.
This will help drivers shared by multiple platforms to take only the
necessary actions while suspending/resuming (some platform may not need
to save/restore all the registers if platforms remains powered while
suspended). In this way suspend/resume time could be improved.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
include/linux/suspend.h | 6 ++++++
kernel/power/suspend.c | 13 +++++++++++++
2 files changed, 19 insertions(+)

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 3f529ad9a9d2..21f19b167fe2 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -173,6 +173,9 @@ static inline void dpm_save_failed_step(enum suspend_stat_step step)
* Called by the PM core if the suspending of devices fails.
* This callback is optional and should only be implemented by platforms
* which require special recovery actions in that situation.
+ *
+ * @off_in_suspend: Returns wether the platform's power will be cut off at
+ * the end of suspend procedure or not.
*/
struct platform_suspend_ops {
int (*valid)(suspend_state_t state);
@@ -185,6 +188,7 @@ struct platform_suspend_ops {
bool (*suspend_again)(void);
void (*end)(void);
void (*recover)(void);
+ bool (*off_in_suspend)(suspend_state_t state);
};

struct platform_s2idle_ops {
@@ -275,6 +279,7 @@ extern void arch_suspend_disable_irqs(void);
extern void arch_suspend_enable_irqs(void);

extern int pm_suspend(suspend_state_t state);
+extern bool platform_off_in_suspend(suspend_state_t state);
#else /* !CONFIG_SUSPEND */
#define suspend_valid_only_mem NULL

@@ -287,6 +292,7 @@ static inline bool pm_suspend_via_s2idle(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 bool platform_off_in_suspend(suspend_state_t state) { return false; }
static inline bool idle_should_enter_s2idle(void) { return false; }
static inline void __init pm_states_init(void) {}
static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {}
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 0bd595a0b610..e1f60c8a17b9 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -319,6 +319,19 @@ static bool platform_suspend_again(suspend_state_t state)
suspend_ops->suspend_again() : false;
}

+/**
+ * platform_off_in_suspend() - specifies if SoC's power will pe cut off at the
+ * end of suspend procedure.
+ */
+bool platform_off_in_suspend(suspend_state_t state)
+{
+ if (!suspend_ops || !suspend_ops->off_in_suspend)
+ return false;
+
+ return suspend_ops->off_in_suspend(state);
+}
+EXPORT_SYMBOL_GPL(platform_off_in_suspend);
+
#ifdef CONFIG_PM_DEBUG
static unsigned int pm_test_delay = 5;
module_param(pm_test_delay, uint, 0644);
--
2.7.4
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