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ACPI / sleep: Do not save NVS for new machines to accelerate S3 

NVS region is saved and restored unconditionally for machines without
nvs_nosave quirk during S3. Tested some new machines and the operation
is not necessary. Saving NVS region also affects S2RAM speed. The time of
NVS saving and restoring depends on the size of NVS region and it consumes
7~10ms normally.

This patch is to make machines produced from 2012 to now not saving NVS region
to accelerate S3.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lan Tianyu 2014-07-23 14:42:33 +08:00 committed by Rafael J. Wysocki
parent 9a3c4145af
commit 821d6f0359
1 changed files with 5 additions and 0 deletions
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5
drivers/acpi/sleep.c
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@ -322,6 +322,11 @@ static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
static void acpi_sleep_dmi_check(void)
{
int year;
if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
acpi_nvs_nosave_s3();
dmi_check_system(acpisleep_dmi_table);
}