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ACPI suspend: Call _PTS before suspending devices

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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
suspend code follows ACPI 2.0 in that respect which causes some
ACPI 1.0x systems to hang during suspend (ref.
http://bugzilla.kernel.org/show_bug.cgi?id=9528).

Make the suspend code execute _PTS before putting devices into low
power states (ie. in accordance with ACPI 1.0x) and provide a command
line option to override the default if need be.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2008-01-08 00:07:39 +01:00 committed by Len Brown
parent 3c1d2b6085
commit 60417f5976
2 changed files with 43 additions and 13 deletions
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5
Documentation/kernel-parameters.txt
View File

@ -168,6 +168,11 @@ and is between 256 and 4096 characters. It is defined in the file
acpi_irq_isa= [HW,ACPI] If irq_balance, mark listed IRQs used by ISA
Format: <irq>,<irq>...
acpi_new_pts_ordering [HW,ACPI]
Enforce the ACPI 2.0 ordering of the _PTS control
method wrt putting devices into low power states
default: pre ACPI 2.0 ordering of _PTS
acpi_no_auto_ssdt [HW,ACPI] Disable automatic loading of SSDT
acpi_os_name= [HW,ACPI] Tell ACPI BIOS the name of the OS

51
drivers/acpi/sleep/main.c
View File

@ -26,6 +26,21 @@ u8 sleep_states[ACPI_S_STATE_COUNT];
#ifdef CONFIG_PM_SLEEP
static u32 acpi_target_sleep_state = ACPI_STATE_S0;
static bool acpi_sleep_finish_wake_up;
/*
* ACPI 2.0 and later want us to execute _PTS after suspending devices, so we
* allow the user to request that behavior by using the 'acpi_new_pts_ordering'
* kernel command line option that causes the following variable to be set.
*/
static bool new_pts_ordering;
static int __init acpi_new_pts_ordering(char *str)
{
new_pts_ordering = true;
return 1;
}
__setup("acpi_new_pts_ordering", acpi_new_pts_ordering);
#endif
int acpi_sleep_prepare(u32 acpi_state)
@ -74,6 +89,14 @@ static int acpi_pm_begin(suspend_state_t pm_state)
if (sleep_states[acpi_state]) {
acpi_target_sleep_state = acpi_state;
if (new_pts_ordering)
return 0;
error = acpi_sleep_prepare(acpi_state);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
else
acpi_sleep_finish_wake_up = true;
} else {
printk(KERN_ERR "ACPI does not support this state: %d\n",
pm_state);
@ -91,15 +114,17 @@ static int acpi_pm_begin(suspend_state_t pm_state)
static int acpi_pm_prepare(void)
{
int error;
if (new_pts_ordering) {
int error = acpi_sleep_prepare(acpi_target_sleep_state);
error = acpi_sleep_prepare(acpi_target_sleep_state);
if (error)
acpi_target_sleep_state = ACPI_STATE_S0;
else if (!ACPI_SUCCESS(acpi_hw_disable_all_gpes()))
error = -EFAULT;
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
return error;
}
acpi_sleep_finish_wake_up = true;
}
return error;
return ACPI_SUCCESS(acpi_hw_disable_all_gpes()) ? 0 : -EFAULT;
}
/**
@ -123,10 +148,8 @@ static int acpi_pm_enter(suspend_state_t pm_state)
if (acpi_state == ACPI_STATE_S3) {
int error = acpi_save_state_mem();
if (error) {
acpi_target_sleep_state = ACPI_STATE_S0;
if (error)
return error;
}
}
local_irq_save(flags);
@ -187,6 +210,7 @@ static void acpi_pm_finish(void)
acpi_set_firmware_waking_vector((acpi_physical_address) 0);
acpi_target_sleep_state = ACPI_STATE_S0;
acpi_sleep_finish_wake_up = false;
#ifdef CONFIG_X86
if (init_8259A_after_S1) {
@ -203,10 +227,11 @@ static void acpi_pm_finish(void)
static void acpi_pm_end(void)
{
/*
* This is necessary in case acpi_pm_finish() is not called during a
* failing transition to a sleep state.
* This is necessary in case acpi_pm_finish() is not called directly
* during a failing transition to a sleep state.
*/
acpi_target_sleep_state = ACPI_STATE_S0;
if (acpi_sleep_finish_wake_up)
acpi_pm_finish();
}
static int acpi_pm_state_valid(suspend_state_t pm_state)