From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753245AbbLXOlK (ORCPT ); Thu, 24 Dec 2015 09:41:10 -0500 Received: from mga04.intel.com ([192.55.52.120]:10128 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751036AbbLXOlI (ORCPT ); Thu, 24 Dec 2015 09:41:08 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,474,1444719600"; d="scan'208";a="880420200" To: Wolfram Sang Cc: srinivas.kowtal@intel.com, linux-i2c@vger.kernel.org, "linux-kernel@vger.kernel.org" From: "Fu, Zhonghui" Subject: [PATCH 1/2] i2c: enable i2c device to suspend/resume asynchronously Message-ID: <567C0401.8000806@linux.intel.com> Date: Thu, 24 Dec 2015 22:41:05 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now, PM core supports asynchronous suspend/resume mode for devices during system suspend/resume, and the power state transition of one device may be completed in separate kernel thread. PM core ensures all power state transition dependency between devices. This patch enables i2c devices to suspend/resume asynchronously. This will take advantage of multicore and improve system suspend/resume speed. After enabling all i2c devices, i2c adapters and i2c controllers on ASUS T100TA tablet, the system suspend-to-idle time is reduced to about 510ms from 750ms, and the system resume time is reduced to about 790ms from 900ms. Signed-off-by: Zhonghui Fu --- drivers/i2c/i2c-core.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index ba8eb08..4ff620e 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1072,6 +1072,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) client->dev.of_node = info->of_node; client->dev.fwnode = info->fwnode; + device_enable_async_suspend(&client->dev); i2c_dev_set_name(adap, client); status = device_register(&client->dev); if (status) -- 1.7.1