diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 | ||||
| -rw-r--r-- | drivers/acpi/sleep/main.c | 51 |
2 files changed, 43 insertions, 13 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 92c40d174355..cf3868956f1e 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -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 diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c index 198ff8a1529a..c37c4ead95c9 100644 --- a/drivers/acpi/sleep/main.c +++ b/drivers/acpi/sleep/main.c @@ -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) |