Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760096Ab2EDUuj (ORCPT ); Fri, 4 May 2012 16:50:39 -0400 Received: from ogre.sisk.pl ([193.178.161.156]:54035 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760072Ab2EDUue (ORCPT ); Fri, 4 May 2012 16:50:34 -0400 From: "Rafael J. Wysocki" To: Bjorn Helgaas Subject: Re: [RFC v2 3/5] PCIe, Add runtime PM support to PCIe port Date: Fri, 4 May 2012 22:55:13 +0200 User-Agent: KMail/1.13.6 (Linux/3.4.0-rc5+; KDE/4.6.0; x86_64; ; ) Cc: Huang Ying , ming.m.lin@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Zheng Yan References: <1336119221-21146-1-git-send-email-ying.huang@intel.com> <1336119221-21146-4-git-send-email-ying.huang@intel.com> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201205042255.13508.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1217 Lines: 29 On Friday, May 04, 2012, Bjorn Helgaas wrote: > On Fri, May 4, 2012 at 2:13 AM, Huang Ying wrote: > > From: Zheng Yan > > > > This patch adds runtime PM support to PCIe port. This is needed by > > PCIe D3cold support, where PCIe device in slot may be powered on/off > > by PCIe port. > > I assume this works for integrated PCIe devices as well as those that > are plugged into a slot and can be physically removed -- maybe the > text "in slot" is superfluous? > > > Because runtime suspend is broken for some chipset, a white list is > > used to enable runtime PM support for only chipset known to work. > > A whitelist requires perpetual maintenance. Every time a new working > chipset comes out, you have to update the whitelist. That doesn't > seem right. Well, we can't possibly enable the feature for all PCIe ports in existence either, because some of them will not work with it (almost surely). 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/