From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752308Ab3HVJMD (ORCPT ); Thu, 22 Aug 2013 05:12:03 -0400 Received: from e23smtp07.au.ibm.com ([202.81.31.140]:53977 "EHLO e23smtp07.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751921Ab3HVJMB (ORCPT ); Thu, 22 Aug 2013 05:12:01 -0400 Message-ID: <5215D540.9020309@linux.vnet.ibm.com> Date: Thu, 22 Aug 2013 14:39:20 +0530 From: Preeti U Murthy User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 MIME-Version: 1.0 To: Benjamin Herrenschmidt CC: fweisbec@gmail.com, paul.gortmaker@windriver.com, paulus@samba.org, shangw@linux.vnet.ibm.com, galak@kernel.crashing.org, deepthi@linux.vnet.ibm.com, paulmck@linux.vnet.ibm.com, arnd@arndb.de, linux-pm@vger.kernel.org, rostedt@goodmis.org, rjw@sisk.pl, john.stultz@linaro.org, tglx@linutronix.de, chenhui.zhao@freescale.com, michael@ellerman.id.au, r58472@freescale.com, geoff@infradead.org, linux-kernel@vger.kernel.org, srivatsa.bhat@linux.vnet.ibm.com, schwidefsky@de.ibm.com, svaidy@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org Subject: Re: [RFC V2 PATCH 4/6] cpuidle/ppc: Add longnap state to the idle states on powernv References: <20130814115311.5193.32212.stgit@preeti.in.ibm.com> <20130814115623.5193.36974.stgit@preeti.in.ibm.com> <1377142130.25016.273.camel@pasglop> In-Reply-To: <1377142130.25016.273.camel@pasglop> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13082208-0260-0000-0000-00000381227A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Ben, On 08/22/2013 08:58 AM, Benjamin Herrenschmidt wrote: > On Wed, 2013-08-14 at 17:26 +0530, Preeti U Murthy wrote: >> This patch hooks into the existing broadcast framework along with the support >> that this patchset introduces for ppc, and the cpuidle driver backend >> for powernv(posted out by Deepthi Dharwar:https://lkml.org/lkml/2013/7/23/128) >> to add sleep state as one of the deep idle states, in which the decrementer >> is switched off. >> >> However in this patch, we only emulate sleep by going into a state which does >> a nap with the decrementer interrupts disabled, termed as longnap. This enables >> focus on the timer broadcast framework for ppc in this series of patches , >> which is required as a first step to enable sleep on ppc. > > This is only for debug / proof of concept right ? We should use a real > sleep here. > > If we need to know whether the FW supports it (PORE etc...) we shall add > a device-tree property from the FW to indicate that fact. We also need the sleep support right? The context management, I mean. Yes it is a debug patch, so as to first ensure that we have the hook up to the broadcast framework done right. Regards Preeti U Murthy