From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jordan Crouse" Subject: Re: ACPI: Idle Processor PM Improvements Date: Fri, 1 Sep 2006 09:51:17 -0600 Message-ID: <20060901155117.GD18448@cosmic.amd.com> References: <200608311713.21618.bjorn.helgaas@hp.com> <1157070616.7974.232.camel@localhost.localdomain> <200608312353.05337.len.brown@intel.com> <20060901041221.GA15330@srcf.ucam.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from outbound-kan.frontbridge.com ([63.161.60.23]:49887 "EHLO outbound1-kan-R.bigfish.com") by vger.kernel.org with ESMTP id S932097AbWIAPvO (ORCPT ); Fri, 1 Sep 2006 11:51:14 -0400 In-Reply-To: <20060901041221.GA15330@srcf.ucam.org> Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Matthew Garrett Cc: Len Brown , Linux Kernel ML , Dominik Brodowski , ACPI ML , Adam Belay , "Pallipadi, Venkatesh" , Arjan van de Ven , devel@laptop.org, Bjorn Helgaas On 01/09/06 05:12 +0100, Matthew Garrett wrote: > On Thu, Aug 31, 2006 at 11:53:04PM -0400, Len Brown wrote: > > > The Geode doesn't suport any C-states -- so ACPI wouldn't help them there anyway. > > Are you sure of that? The docs I have here suggest C1 and C2, but it's > possible that that's just the companion chip and they aren't implemented > in the CPU. C1 is essentially suspend on hlt. We have something called Automatic Hardware Clock Gating that kicks in when the blocks go unused, so that saves a bit more power (especially in the south bridge) then we would with just a simple hlt. In any event, this already happens without the assistance of ACPI. The 5536 has support for a C2 state as well, but I don't know if that has any effect on the GX or not. Jordan -- Jordan Crouse Senior Linux Engineer Advanced Micro Devices, Inc.