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authorMatthew Garrett <mjg@redhat.com>2010-05-28 16:32:15 -0400
committerLen Brown <len.brown@intel.com>2010-06-10 11:03:15 -0400
commit2a6b69765ad794389f2fc3e14a0afa1a995221c2 (patch)
tree63c22656f682ba94cdeb882ee370966af57f41c9 /drivers/acpi
parentdd4c4f17d722ffeb2515bf781400675a30fcead7 (diff)
ACPI: Store NVS state even when entering suspend to RAM
https://bugzilla.kernel.org/show_bug.cgi?id=13931 describes a bug where a system fails to successfully resume after the second suspend. Maxim Levitsky discovered that this could be rectified by forcibly saving and restoring the ACPI non-volatile state. The spec indicates that this is only required for S4, but testing the behaviour of Windows by adding an ACPI NVS region to qemu's e820 map and registering a custom memory read/write handler reveals that it's saved and restored even over suspend to RAM. We should mimic that behaviour to avoid other broken platforms. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/sleep.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index bcaa6efa8136..403daf0fc8a0 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -112,6 +112,8 @@ static int __acpi_pm_prepare(void)
{
int error = acpi_sleep_prepare(acpi_target_sleep_state);
+ suspend_nvs_save();
+
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
@@ -140,6 +142,8 @@ static void acpi_pm_finish(void)
{
u32 acpi_state = acpi_target_sleep_state;
+ suspend_nvs_free();
+
if (acpi_state == ACPI_STATE_S0)
return;
@@ -189,6 +193,11 @@ static int acpi_suspend_begin(suspend_state_t pm_state)
u32 acpi_state = acpi_suspend_states[pm_state];
int error = 0;
+ error = suspend_nvs_alloc();
+
+ if (error)
+ return error;
+
if (sleep_states[acpi_state]) {
acpi_target_sleep_state = acpi_state;
acpi_sleep_tts_switch(acpi_target_sleep_state);
@@ -264,6 +273,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
if (acpi_state == ACPI_STATE_S3)
acpi_restore_state_mem();
+ suspend_nvs_restore();
+
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
@@ -430,12 +441,6 @@ static int acpi_hibernation_enter(void)
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}
-static void acpi_hibernation_finish(void)
-{
- suspend_nvs_free();
- acpi_pm_finish();
-}
-
static void acpi_hibernation_leave(void)
{
/*
@@ -473,7 +478,7 @@ static struct platform_hibernation_ops acpi_hibernation_ops = {
.begin = acpi_hibernation_begin,
.end = acpi_pm_end,
.pre_snapshot = acpi_hibernation_pre_snapshot,
- .finish = acpi_hibernation_finish,
+ .finish = acpi_pm_finish,
.prepare = acpi_pm_prepare,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,
@@ -526,7 +531,7 @@ static struct platform_hibernation_ops acpi_hibernation_ops_old = {
.begin = acpi_hibernation_begin_old,
.end = acpi_pm_end,
.pre_snapshot = acpi_hibernation_pre_snapshot_old,
- .finish = acpi_hibernation_finish,
+ .finish = acpi_pm_finish,
.prepare = acpi_pm_disable_gpes,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,