Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934606AbbENARC (ORCPT ); Wed, 13 May 2015 20:17:02 -0400 Received: from v094114.home.net.pl ([79.96.170.134]:50007 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S933920AbbENARA (ORCPT ); Wed, 13 May 2015 20:17:00 -0400 From: "Rafael J. Wysocki" To: Kevin Hilman Cc: Daniel Lezcano , Preeti U Murthy , Peter Zijlstra , Thomas Gleixner , "Rafael J. Wysocki" , rlippert@google.com, "linux-pm@vger.kernel.org" , Linus Walleij , lkml , Ingo Molnar , Sudeep Holla , linuxppc-dev@lists.ozlabs.org, Lina Iyer , Ulf Hansson Subject: Re: [PATCH 0/3] cpuidle: updates related to tick_broadcast_enter() failures Date: Thu, 14 May 2015 02:42:11 +0200 Message-ID: <3381363.cclTYyKPz9@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/4.0.0+; KDE/4.11.5; x86_64; ; ) In-Reply-To: References: <20150508073418.28491.4150.stgit@preeti.in.ibm.com> <1842725.60y5FMGEPh@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1675 Lines: 41 On Wednesday, May 13, 2015 05:13:27 PM Kevin Hilman wrote: > On Wed, May 13, 2015 at 5:16 PM, Rafael J. Wysocki wrote: > > On Wednesday, May 13, 2015 03:59:55 PM Kevin Hilman wrote: > >> "Rafael J. Wysocki" writes: > >> > >> [...] > >> > >> > Second, quite honestly, I don't see a connection to genpd here. > >> > >> The connection with genpd is because the *reason* the timer was > >> shutdown/stopped is because it shares power with the CPU, which is why > >> the timer stops when the CPU hits ceratin low power states. IOW, it's > >> in the same power domain as the CPU. > > > > Well, what if you don't have genpd on that system? Is the problem at hand not > > relevant then magically? > > Well, if you're not using genpd to model hardware power domain > dependencies, then yes you'll definitely need a different solution. > > And, as we discussed on IRC. If you only care about timers, and genpd > is not in use, then $SUBJECT series is a fine approach, and I have no > objections. But for SoCs where there are several other things that > share power with CPU, we need a more generic, genpd based solution, > which it seems we're in agreement on. And since the two approaches > are not mutually exclusive, then I have real objections to applying > this series. I guess a "no" is missing in the last sentence. ;-) > Acked-by: Kevin Hilman Thanks! Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/