From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Fu, Zhonghui" Subject: Re: [PATCH 1/2] i2c: enable i2c device to suspend/resume asynchronously Date: Fri, 22 Jan 2016 12:44:33 +0800 Message-ID: <56A1B3B1.7010903@linux.intel.com> References: <567C0401.8000806@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:18483 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751562AbcAVEog (ORCPT ); Thu, 21 Jan 2016 23:44:36 -0500 In-Reply-To: <567C0401.8000806@linux.intel.com> Sender: linux-i2c-owner@vger.kernel.org List-Id: linux-i2c@vger.kernel.org To: Wolfram Sang Cc: srinivas.kowtal@intel.com, linux-i2c@vger.kernel.org, "linux-kernel@vger.kernel.org" Hi Wolfram, What do you think about this patch? Thanks, Zhonghui On 12/24/2015 10:41 PM, Fu, Zhonghui wrote: > 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 >