===================================================================
@@ -187,6 +187,11 @@ struct platform_suspend_ops {
void (*recover)(void);
};
+struct platform_freeze_ops {
+ int (*begin)(void);
+ void (*end)(void);
+};
+
#ifdef CONFIG_SUSPEND
/**
* suspend_set_ops - set platform dependent suspend operations
@@ -194,6 +199,7 @@ struct platform_suspend_ops {
*/
extern void suspend_set_ops(const struct platform_suspend_ops *ops);
extern int suspend_valid_only_mem(suspend_state_t state);
+extern void freeze_set_ops(const struct platform_freeze_ops *ops);
extern void freeze_wake(void);
/**
@@ -220,6 +226,7 @@ extern int pm_suspend(suspend_state_t st
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 void freeze_set_ops(const struct platform_freeze_ops *ops) {}
static inline void freeze_wake(void) {}
#endif /* !CONFIG_SUSPEND */
===================================================================
@@ -38,6 +38,7 @@ const char *const pm_states[PM_SUSPEND_M
};
static const struct platform_suspend_ops *suspend_ops;
+static const struct platform_freeze_ops *freeze_ops;
static bool need_suspend_ops(suspend_state_t state)
{
@@ -47,6 +48,13 @@ static bool need_suspend_ops(suspend_sta
static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
static bool suspend_freeze_wake;
+void freeze_set_ops(const struct platform_freeze_ops *ops)
+{
+ lock_system_sleep();
+ freeze_ops = ops;
+ unlock_system_sleep();
+}
+
static void freeze_begin(void)
{
suspend_freeze_wake = false;
@@ -271,6 +279,10 @@ int suspend_devices_and_enter(suspend_st
error = suspend_ops->begin(state);
if (error)
goto Close;
+ } else if (state == PM_SUSPEND_FREEZE && freeze_ops->begin) {
+ error = freeze_ops->begin();
+ if (error)
+ goto Close;
}
suspend_console();
suspend_test_start();
@@ -296,6 +308,9 @@ int suspend_devices_and_enter(suspend_st
Close:
if (need_suspend_ops(state) && suspend_ops->end)
suspend_ops->end();
+ else if (state == PM_SUSPEND_FREEZE && freeze_ops->end)
+ freeze_ops->end();
+
trace_machine_suspend(PWR_EVENT_EXIT);
return error;
===================================================================
@@ -611,6 +611,22 @@ static const struct platform_suspend_ops
.recover = acpi_pm_finish,
};
+static int acpi_freeze_begin(void)
+{
+ acpi_scan_lock_acquire();
+ return 0;
+}
+
+static void acpi_freeze_end(void)
+{
+ acpi_scan_lock_release();
+}
+
+static const struct platform_freeze_ops acpi_freeze_ops = {
+ .begin = acpi_freeze_begin,
+ .end = acpi_freeze_end,
+};
+
static void acpi_sleep_suspend_setup(void)
{
int i;
@@ -621,7 +637,9 @@ static void acpi_sleep_suspend_setup(voi
suspend_set_ops(old_suspend_ordering ?
&acpi_suspend_ops_old : &acpi_suspend_ops);
+ freeze_set_ops(&acpi_freeze_ops);
}
+
#else /* !CONFIG_SUSPEND */
static inline void acpi_sleep_suspend_setup(void) {}
#endif /* !CONFIG_SUSPEND */