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From: "Jordan Crouse" <jordan.crouse@amd.com>
To: "Matthew Garrett" <mjg59@srcf.ucam.org>
Cc: "Len Brown" <lenb@kernel.org>,
	"Linux Kernel ML" <linux-kernel@vger.kernel.org>,
	"Dominik Brodowski" <linux@dominikbrodowski.net>,
	"ACPI ML" <linux-acpi@vger.kernel.org>,
	"Adam Belay" <abelay@novell.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	"Arjan van de Ven" <arjan@linux.intel.com>,
	devel@laptop.org, "Bjorn Helgaas" <bjorn.helgaas@hp.com>
Subject: Re: ACPI: Idle Processor PM Improvements
Date: Fri, 1 Sep 2006 09:51:17 -0600	[thread overview]
Message-ID: <20060901155117.GD18448@cosmic.amd.com> (raw)
In-Reply-To: <20060901041221.GA15330@srcf.ucam.org>

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.
<www.amd.com/embeddedprocessors>



  reply	other threads:[~2006-09-01 15:51 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-30 18:40 [RFC][PATCH 1/2] " Pallipadi, Venkatesh
2006-08-30 19:43 ` Matthew Garrett
2006-08-31 23:13   ` Bjorn Helgaas
2006-09-01  0:30     ` [OLPC-devel] " Jim Gettys
2006-09-01  3:53       ` Len Brown
2006-09-01  4:12         ` Matthew Garrett
2006-09-01 15:51           ` Jordan Crouse [this message]
2006-09-01 13:14         ` Carl-Daniel Hailfinger
2006-09-01 21:52         ` Andi Kleen
2006-09-01 22:57           ` Alan Cox
2006-09-04 13:13         ` Pavel Machek
2006-09-04 13:09       ` Pavel Machek
2006-09-05 14:31         ` Jim Gettys
2006-09-06 10:37           ` Pavel Machek
2006-09-06 14:58             ` Jordan Crouse
2006-09-12  9:21               ` Pavel Machek
2006-09-12 18:14                 ` Jim Gettys
2006-09-12 18:27                   ` Mitch Bradley
2006-09-12 20:18                   ` Jordan Crouse
2006-09-14  9:20                     ` Pavel Machek
2006-09-14  9:18                   ` Pavel Machek
2006-09-14 11:29                     ` Jim Gettys
2006-09-06 15:19             ` [OLPC-devel] Re: [RFC][PATCH 1/2] " Jim Gettys
2006-09-12  9:21               ` Pavel Machek

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