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ACPI hibernation: Call _PTS before suspending devices 

The ACPI 1.0 specification wants us to put devices into low power
states after executing the _PTS global control method, while ACPI
2.0 and later want us to do that in the reverse order.  The current
hibernation code follows ACPI 2.0 in that respect which may cause some
ACPI 1.0x systems to hang during hibernation (ref.
http://bugzilla.kernel.org/show_bug.cgi?id=9528).

Make the hibernation code execute _PTS before putting devices into
low power states (ie. in accordance with ACPI 1.0x) with the
possibility to override that using the 'acpi_new_pts_ordering' kernel
command line option.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Rafael J. Wysocki 2008-01-08 00:09:58 +01:00 committed by Len Brown
parent caea99ef33
commit 7258ec5d11
1 changed files with 25 additions and 11 deletions
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36
drivers/acpi/sleep/main.c
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@ -283,22 +283,34 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
#ifdef CONFIG_HIBERNATION
static int acpi_hibernation_begin(void)
{
int error;
acpi_target_sleep_state = ACPI_STATE_S4;
return 0;
if (new_pts_ordering)
return 0;
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
else
acpi_sleep_finish_wake_up = true;
return error;
}
static int acpi_hibernation_prepare(void)
{
int error;
if (new_pts_ordering) {
int error = acpi_sleep_prepare(ACPI_STATE_S4);
error = acpi_sleep_prepare(ACPI_STATE_S4);
if (error)
return error;
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
}
acpi_sleep_finish_wake_up = true;
}
if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
error = -EFAULT;
return error;
return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
}
static int acpi_hibernation_enter(void)
@ -339,15 +351,17 @@ static void acpi_hibernation_finish(void)
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_sleep_finish_wake_up = false;
}
static void acpi_hibernation_end(void)
{
/*
* This is necessary in case acpi_hibernation_finish() is not called
* during a failing transition to the sleep state.
* directly during a failing transition to the sleep state.
*/
acpi_target_sleep_state = ACPI_STATE_S0;
if (acpi_sleep_finish_wake_up)
acpi_hibernation_finish();
}
static int acpi_hibernation_pre_restore(void)