From patchwork Fri Jan 15 06:38:09 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Fu, Zhonghui" X-Patchwork-Id: 567944 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 8B62B140BFC for ; Fri, 15 Jan 2016 17:38:18 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751325AbcAOGiR (ORCPT ); Fri, 15 Jan 2016 01:38:17 -0500 Received: from mga04.intel.com ([192.55.52.120]:56995 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750929AbcAOGiQ (ORCPT ); Fri, 15 Jan 2016 01:38:16 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP; 14 Jan 2016 22:38:17 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,298,1449561600"; d="scan'208";a="893655397" Received: from cju-mobl2.ccr.corp.intel.com (HELO [10.254.209.69]) ([10.254.209.69]) by fmsmga002.fm.intel.com with ESMTP; 14 Jan 2016 22:38:10 -0800 To: Andy Shevchenko , jarkko.nikula@linux.intel.com, Mika Westerberg , Wolfram Sang Cc: linux-i2c@vger.kernel.org, "linux-kernel@vger.kernel.org" From: "Fu, Zhonghui" Subject: [PATCH v2] i2c/designware: enable i2c controller to suspend/resume asynchronously Message-ID: <569893D1.5050403@linux.intel.com> Date: Fri, 15 Jan 2016 14:38:09 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@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 designware i2c controllers 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 --- Changes in v2: - Move the device_enable_async_suspend() call into i2c_dw_proble() drivers/i2c/busses/i2c-designware-core.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index ba9732c..5d6ad27 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -861,6 +861,7 @@ int i2c_dw_probe(struct dw_i2c_dev *dev) init_completion(&dev->cmd_complete); mutex_init(&dev->lock); + device_enable_async_suspend(dev->dev); r = i2c_dw_init(dev); if (r)