Commit e870c6c8 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / PM: Prefer suspend-to-idle over S3 on some systems 



Modify the ACPI system sleep support setup code to select
suspend-to-idle as the default system sleep state if
(1) the ACPI_FADT_LOW_POWER_S0 flag is set in the FADT and
(2) the Low Power Idle S0 _DSM interface has been discovered and
(3) the default sleep state was not selected from the kernel command
line.

The main motivation for this change is that systems where the (1) and
(2) conditions are met typically ship with OSes that don't exercise
the S3 path in the platform firmware which remains untested and turns
out to be non-functional at least in some cases.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: default avatarMario Limonciello <mario.limonciello@dell.com>
parent 635173a1

Documentation/power/states.txt

+3 −1
Original line number Diff line number Diff line
@@ -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

/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"

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.

drivers/acpi/sleep.c

+6 −0
Original line number Diff line number Diff line
@@ -714,6 +714,12 @@ static int lps0_device_attach(struct acpi_device *adev, 
		if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {

			lps0_dsm_func_mask = bitmask;

			lps0_device_handle = adev->handle;

			/*

			 * Use suspend-to-idle by default if the default

			 * suspend mode was not set from the command line.

			 */

			if (mem_sleep_default > PM_SUSPEND_MEM)

				mem_sleep_current = PM_SUSPEND_FREEZE;

		}



		acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",

include/linux/suspend.h

+3 −0
Original line number Diff line number Diff line
@@ -196,6 +196,9 @@ struct platform_freeze_ops { 
};



#ifdef CONFIG_SUSPEND

extern suspend_state_t mem_sleep_current;

extern suspend_state_t mem_sleep_default;



/**

 * suspend_set_ops - set platform dependent suspend operations

 * @ops: The new suspend operations to set.

kernel/power/power.h

+0 −1
Original line number Diff line number Diff line
@@ -192,7 +192,6 @@ extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *); 
extern const char * const pm_labels[];

extern const char *pm_states[];

extern const char *mem_sleep_states[];

extern suspend_state_t mem_sleep_current;



extern int suspend_devices_and_enter(suspend_state_t state);

#else /* !CONFIG_SUSPEND */

kernel/power/suspend.c

+2 −2
Original line number Diff line number Diff line
@@ -48,7 +48,7 @@ static const char * const mem_sleep_labels[] = { 
const char *mem_sleep_states[PM_SUSPEND_MAX];



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;

suspend_state_t pm_suspend_target_state;

EXPORT_SYMBOL_GPL(pm_suspend_target_state);
@@ -216,7 +216,7 @@ void suspend_set_ops(const struct platform_suspend_ops *ops) 
	}

	if (valid_state(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;

	}

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