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Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/sleep/main.c49
1 files changed, 48 insertions, 1 deletions
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index d13194a031b..c7f0c9cd870 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -15,6 +15,7 @@
#include <linux/dmi.h>
#include <linux/device.h>
#include <linux/suspend.h>
+#include <linux/reboot.h>
#include <asm/io.h>
@@ -24,6 +25,36 @@
u8 sleep_states[ACPI_S_STATE_COUNT];
+static void acpi_sleep_tts_switch(u32 acpi_state)
+{
+ union acpi_object in_arg = { ACPI_TYPE_INTEGER };
+ struct acpi_object_list arg_list = { 1, &in_arg };
+ acpi_status status = AE_OK;
+
+ in_arg.integer.value = acpi_state;
+ status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
+ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+ /*
+ * OS can't evaluate the _TTS object correctly. Some warning
+ * message will be printed. But it won't break anything.
+ */
+ printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
+ }
+}
+
+static int tts_notify_reboot(struct notifier_block *this,
+ unsigned long code, void *x)
+{
+ acpi_sleep_tts_switch(ACPI_STATE_S5);
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block tts_notifier = {
+ .notifier_call = tts_notify_reboot,
+ .next = NULL,
+ .priority = 0,
+};
+
static int acpi_sleep_prepare(u32 acpi_state)
{
#ifdef CONFIG_ACPI_SLEEP
@@ -131,6 +162,7 @@ static void acpi_pm_end(void)
* failing transition to a sleep state.
*/
acpi_target_sleep_state = ACPI_STATE_S0;
+ acpi_sleep_tts_switch(acpi_target_sleep_state);
}
#endif /* CONFIG_PM_SLEEP */
@@ -155,6 +187,7 @@ static int acpi_suspend_begin(suspend_state_t pm_state)
if (sleep_states[acpi_state]) {
acpi_target_sleep_state = acpi_state;
+ acpi_sleep_tts_switch(acpi_target_sleep_state);
} else {
printk(KERN_ERR "ACPI does not support this state: %d\n",
pm_state);
@@ -313,6 +346,7 @@ void __init acpi_no_s4_hw_signature(void)
static int acpi_hibernation_begin(void)
{
acpi_target_sleep_state = ACPI_STATE_S4;
+ acpi_sleep_tts_switch(acpi_target_sleep_state);
return 0;
}
@@ -376,7 +410,15 @@ static struct platform_hibernation_ops acpi_hibernation_ops = {
*/
static int acpi_hibernation_begin_old(void)
{
- int error = acpi_sleep_prepare(ACPI_STATE_S4);
+ int error;
+ /*
+ * The _TTS object should always be evaluated before the _PTS object.
+ * When the old_suspended_ordering is true, the _PTS object is
+ * evaluated in the acpi_sleep_prepare.
+ */
+ acpi_sleep_tts_switch(ACPI_STATE_S4);
+
+ error = acpi_sleep_prepare(ACPI_STATE_S4);
if (!error)
acpi_target_sleep_state = ACPI_STATE_S4;
@@ -596,5 +638,10 @@ int __init acpi_sleep_init(void)
pm_power_off = acpi_power_off;
}
printk(")\n");
+ /*
+ * Register the tts_notifier to reboot notifier list so that the _TTS
+ * object can also be evaluated when the system enters S5.
+ */
+ register_reboot_notifier(&tts_notifier);
return 0;
}