From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932086AbaEIHnn (ORCPT ); Fri, 9 May 2014 03:43:43 -0400 Received: from mga11.intel.com ([192.55.52.93]:5073 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751338AbaEIHnl (ORCPT ); Fri, 9 May 2014 03:43:41 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,1016,1389772800"; d="scan'208";a="529020272" Message-ID: <536C873D.8030405@intel.com> Date: Fri, 09 May 2014 15:43:57 +0800 From: Lan Tianyu User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0 MIME-Version: 1.0 To: Pavel Machek CC: rjw@rjwysocki.net, lenb@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ACPI/Battery: Accelerate battery resume callback References: <1399183626-13152-1-git-send-email-tianyu.lan@intel.com> <20140509073827.GA4965@xo-6d-61-c0.localdomain> In-Reply-To: <20140509073827.GA4965@xo-6d-61-c0.localdomain> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014年05月09日 15:38, Pavel Machek wrote: > Hi! > >> Most time of battery resume callback is spent on executing AML code >> _BTP, _BIF and _BIF to get battery info, status and set alarm. These >> AML methods may access EC operation regions several times and consumes >> time. >> >> These operations are not necessary during devices resume and can run >> during POST_SUSPEND/HIBERNATION event when all processes are thawed. > > Does it mean that userspace will see pre-hibernation battery level for a while > after resume? Hi Pavel: Thanks for your review. No, when user access the battery sysfs interface, driver will read battery info and return new data. > > Pavel > -- Best regards Tianyu Lan