If the ACPI_FADT_LOW_POWER_S0 bit is set, this indicates the platform
should get identical or better performance using Suspend-To-Idle.
By removing S3 and S1 userspace will prefer suspend-to-idle in
these situations too.
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>
---
drivers/acpi/sleep.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index deb0ff7..ff1d8f1 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -171,6 +171,12 @@ static int __init init_nvs_nosave(const struct dmi_system_id *d)
return 0;
}
+static bool suspend_to_idle_preferred(void)
+{
+ return (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0);
+}
+
+
static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
{
.callback = init_old_suspend_ordering,
@@ -908,6 +914,11 @@ int __init acpi_sleep_init(void)
acpi_no_s5 = true;
}
+ if (suspend_to_idle_preferred()) {
+ sleep_states[ACPI_STATE_S3] = 0;
+ sleep_states[ACPI_STATE_S1] = 0;
+ }
+
supported[0] = 0;
for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
if (sleep_states[i])
--
2.7.4
--
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