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PM / sleep / ACPI: Use the ACPI_FADT_LOW_POWER_S0 flag 

Modify the ACPI system sleep support setup code to select
suspend-to-idle as the default system sleep state if the
ACPI_FADT_LOW_POWER_S0 flag is set in the FADT and the
default sleep state was not selected from the kernel command
line.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mario Limonciello <mario.limonciello@dell.com>
This commit is contained in:
Rafael J. Wysocki 2016-11-17 03:28:53 +01:00
parent 406e79385f
commit 08b98d3291
4 changed files with 15 additions and 3 deletions
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4
Documentation/power/states.txt
View File

@ -35,7 +35,9 @@ only one way to cause the system to go into the Suspend-To-RAM state (write
The default suspend mode (ie. the one to be used without writing anything into The default suspend mode (ie. the one to be used without writing anything into
/sys/power/mem_sleep) is either "deep" (if Suspend-To-RAM is supported) or /sys/power/mem_sleep) is either "deep" (if Suspend-To-RAM is supported) or
"s2idle", but it can be overridden by the value of the "mem_sleep_default" "s2idle", but it can be overridden by the value of the "mem_sleep_default"
parameter in the kernel command line. parameter in the kernel command line. On some ACPI-based systems, depending on
the information in the FADT, the default may be "s2idle" even if Suspend-To-RAM
is supported.
The properties of all of the sleep states are described below. The properties of all of the sleep states are described below.

8
drivers/acpi/sleep.c
View File

@ -691,6 +691,14 @@ static void acpi_sleep_suspend_setup(void)
if (acpi_sleep_state_supported(i)) if (acpi_sleep_state_supported(i))
sleep_states[i] = 1; sleep_states[i] = 1;
/*
* Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set and
* the default suspend mode was not selected from the command line.
*/
if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0 &&
mem_sleep_default > PM_SUSPEND_MEM)
mem_sleep_default = PM_SUSPEND_FREEZE;
suspend_set_ops(old_suspend_ordering ? suspend_set_ops(old_suspend_ordering ?
&acpi_suspend_ops_old : &acpi_suspend_ops); &acpi_suspend_ops_old : &acpi_suspend_ops);
freeze_set_ops(&acpi_freeze_ops); freeze_set_ops(&acpi_freeze_ops);

2
include/linux/suspend.h
View File

@ -194,6 +194,8 @@ struct platform_freeze_ops {
}; };
#ifdef CONFIG_SUSPEND #ifdef CONFIG_SUSPEND
extern suspend_state_t mem_sleep_default;
/** /**
* suspend_set_ops - set platform dependent suspend operations * suspend_set_ops - set platform dependent suspend operations
* @ops: The new suspend operations to set. * @ops: The new suspend operations to set.

4
kernel/power/suspend.c
View File

@ -46,7 +46,7 @@ static const char * const mem_sleep_labels[] = {
const char *mem_sleep_states[PM_SUSPEND_MAX]; const char *mem_sleep_states[PM_SUSPEND_MAX];
suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE; suspend_state_t mem_sleep_current = PM_SUSPEND_FREEZE;
static suspend_state_t mem_sleep_default = PM_SUSPEND_MEM; suspend_state_t mem_sleep_default = PM_SUSPEND_MAX;
unsigned int pm_suspend_global_flags; unsigned int pm_suspend_global_flags;
EXPORT_SYMBOL_GPL(pm_suspend_global_flags); EXPORT_SYMBOL_GPL(pm_suspend_global_flags);
@ -168,7 +168,7 @@ void suspend_set_ops(const struct platform_suspend_ops *ops)
} }
if (valid_state(PM_SUSPEND_MEM)) { if (valid_state(PM_SUSPEND_MEM)) {
mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM]; mem_sleep_states[PM_SUSPEND_MEM] = mem_sleep_labels[PM_SUSPEND_MEM];
if (mem_sleep_default == PM_SUSPEND_MEM) if (mem_sleep_default >= PM_SUSPEND_MEM)
mem_sleep_current = PM_SUSPEND_MEM; mem_sleep_current = PM_SUSPEND_MEM;
} }