linux-kernel - Re: [PATCH 2/5] drivercore: Add driver probe deferral mechanism

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Message-ID: <CACVXFVMnm2rLPNsaLtTT2NtVkh5UFO8mEy7E9VWNYdjhvw2-0A@mail.gmail.com>
Date:	Fri, 14 Oct 2011 08:13:17 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Andrei Warkentin <awarkentin@...are.com>,
	Greg KH <greg@...ah.com>, Dilan Lee <dilee@...dia.com>,
	"G, Manjunath Kondaiah" <manjugk@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Josh Triplett <josh@...htriplett.org>, Manjunath@...per.es,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Linux PM List <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH 2/5] drivercore: Add driver probe deferral mechanism

On Fri, Oct 14, 2011 at 12:04 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Thu, 13 Oct 2011, Ming Lei wrote:
>
>> Hi,
>>
>> On Thu, Oct 13, 2011 at 10:31 PM, Alan Stern <stern@...land.harvard.edu>
>> >> Maybe we should understand the correct model of the ordering constraints
>> >> for the multiple device dependancies first, could you give a description or
>> >> some examples about it?
>> >
>> > The requirement is that devices must be capable of resuming in the
>> > order given by dpm_list, and they must be capable of suspending in
>> > the reverse order.
>> >
>> > Therefore if device A can't work unless device B is functional, then B
>> > must come before A in dpm_list.
>>
>> If all devices can support async suspend and resume correctly, looks like
>> the device order given by dpm_list is not needed any longer, doesn't it?
>
> It _is_ needed, because the user can disable async suspend/resume via
> /sys/power/pm_async.
>
> Also, not all devices do support async suspend/resume.

Basically, the devices which don't support async suspend/resume
should have out of tree PM dependency. If out of tree PM dependency
issue is solved, all devices can support async suspend/resume.

thanks,
-- 
Ming Lei
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