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SubjectRe: [RFC][PATCH 0/7] PM: Asynchronous suspend and resume (updated)
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On Mon, 2009-08-17 at 08:15 +0800, Rafael J. Wysocki wrote:
> On Wednesday 12 August 2009, Rafael J. Wysocki wrote:
> > Hi,
> >
> > The following patches introduce a mechanism allowing us to execute device
> > drivers' suspend and resume callbacks asynchronously during system sleep
> > transitions, such as suspend to RAM. The idea is explained in the [1/1] patch
> > message.
>
> Changes:
>
> * Added [1/7] that fixes kerneldoc comments in drivers/base/power/main.c
> (this is a 2.6.32 candidate).
>
> * Added [2/7] adding a framework for representing PM link (idea described
> in the patch message).
>
> * [3/7] is the async resume patch (idea described in the patch message).
>
> * [4/7] is the async suspend patch.
>
> * [5/7] - [7/7] set async_suspend for devices in a few selected subsystems.
>
> The patches have been tested on HP nx6325.
>
I tried this patch set and it does work. :)
But unfortunately it doesn't save too much time.

I still think that the child device should inherit its parent's
async_suspend flag to do the asynchronous resume more efficiently.

or at least we should provide such an interface
in drivers/base/power/common.c, so that device can tell the device core
to inherit this flag if there is no off-tree dependency.

thanks,
rui

> Thanks,
> Rafael
>

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