RE: Discussion on device's runtime wake capability

["Zhang, Rui" <rui.zhang@intel.com>]

> -----Original Message-----
> From: linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
> owner@vger.kernel.org] On Behalf Of Aaron Lu
> Sent: Tuesday, October 09, 2012 2:23 PM
> To: Rafael J. Wysocki; Len Brown
> Cc: Huang, Ying; Zhang, Rui; linux-acpi@vger.kernel.org
> Subject: Discussion on device's runtime wake capability
> Importance: High
> 
> Hi all,
> 
> We are using _PRW as a hint to see if a device supports wakeup, this is
> fine for device which is able to wake the system in a sleep state, but
> not to wake itself when system is at S0.
> 
> Moreover, when we are to arm the device runtime wake, I think there is
> no need to power on the power resources referenced in _PRW, those power
> resources should be used to give the device ability to wake the system
> from a sleep state, not to wake itself when system is at S0, so
> powering thoses power resources on for run wake is a waste.
> 
Sounds reasonable to me.
To do runtime wake, we only need to power on the resources in _PR0.

> But I may miss something, so it would be very kind of you to point it
> out if things are not like what I've thought, thanks.
> 
> BTW, _S0W seems to be a good hint whether the device supports run wake
> from ACPI's perspective.
>
Agreed.

 
> -Aaron
> 
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