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    SubjectRe: ACPI: Idle Processor PM Improvements
    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>


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