Re: [PATCH -v2] ACPI, PM, Specify lowest allowed state for device sleep state

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On 05/17/2012 09:45 PM, Huang Ying wrote:

> Lower device sleep state can save more power, but has more exit
> latency too.  Sometimes, to satisfy some power QoS and other
> requirement, we need to constrain the lowest device sleep state.
> In this patch, a parameter to specify lowest allowed state for
> acpi_pm_device_sleep_state is added.  So that the caller can enforce
> the constraint via the parameter.
> This is needed by PCIe D3cold support, where the lowest power state
> allowed may be D3_HOT instead of default D3_COLD.
> Changelog:
> v2:
> - Minor change per Rafeal's comments
> Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
> ---
>  drivers/acpi/sleep.c       |   24 +++++++++++++++++++-----
>  drivers/pci/pci-acpi.c     |    3 ++-
>  drivers/pnp/pnpacpi/core.c |    4 ++--
>  include/acpi/acpi_bus.h    |    6 +++---
>  4 files changed, 26 insertions(+), 11 deletions(-)


Len Brown, Intel Open Source Technology Center

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