Commit 821d6f03 authored Jul 23, 2014 by Lan Tianyu Committed by Rafael J. Wysocki Jul 24, 2014

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>

parent 9a3c4145

drivers/acpi/sleep.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

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