Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755858AbaGWGok (ORCPT ); Wed, 23 Jul 2014 02:44:40 -0400 Received: from mga02.intel.com ([134.134.136.20]:4871 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755146AbaGWGoh (ORCPT ); Wed, 23 Jul 2014 02:44:37 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,715,1400050800"; d="scan'208";a="547603453" From: Lan Tianyu To: rjw@rjwysocki.net, lenb@kernel.org Cc: Lan Tianyu , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V2] ACPI/NVS: Not save NVS region for new machine to accelerate S3 Date: Wed, 23 Jul 2014 14:42:33 +0800 Message-Id: <1406097753-7398-1-git-send-email-tianyu.lan@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1405662922-23606-1-git-send-email-tianyu.lan@intel.com> References: <1405662922-23606-1-git-send-email-tianyu.lan@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- Change since V1: Change the order between checking acpisleep quirk table and setting the flag of nosaving nvs for S3. drivers/acpi/sleep.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index b3e3cc7..54da4a3 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -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); } -- 1.8.4.rc0.1.g8f6a3e5.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/