From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [PATCH] PM/domains: add delayed power off capability Date: Tue, 12 Mar 2013 08:19:01 -0700 Message-ID: <20130312151901.GA18438@kroah.com> References: <1363078159-17571-1-git-send-email-mkulkarni@nvidia.com> <20130312134913.GD3514@kroah.com> <513F4208.4040207@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:41335 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754599Ab3CLPSQ (ORCPT ); Tue, 12 Mar 2013 11:18:16 -0400 Received: by mail-pb0-f46.google.com with SMTP id uo15so5066502pbc.5 for ; Tue, 12 Mar 2013 08:18:16 -0700 (PDT) Content-Disposition: inline In-Reply-To: <513F4208.4040207@nvidia.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Mayuresh Kulkarni Cc: "linux-pm@vger.kernel.org" , "len.brown@intel.com" , "pavel@ucw.cz" , "rjw@sisk.pl" , Peter De Schrijver On Tue, Mar 12, 2013 at 08:26:08PM +0530, Mayuresh Kulkarni wrote: > On Tuesday 12 March 2013 07:19 PM, Greg KH wrote: > >On Tue, Mar 12, 2013 at 02:19:19PM +0530, Mayuresh Kulkarni wrote: > >>- this commit adds a capability to delay the powering off > >>of the domain > > > >Why? > > > > - As I mentioned below (sorry for mentioning below rather than at > start), powering off a domain means the context save needs to be > done && it needs to be restored during power on. All of this should be in the changelog section of the patch, please, when you resend this, add it there. > - The downstream kernel has a graphics-host (host1x) driver which > has a home grown power management framework called ACM > (auto-clock-management). We implement both delayed clock and power > partition off functionality in it. We should wait for this driver to be submitted and accepted before we can add these new api hooks. When is that going to happen? thanks, greg k-h