linux-kernel - Re: [GIT PULL] On-demand device probing

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Date:	Tue, 20 Oct 2015 18:21:55 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	David Woodhouse <dwmw2@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <linux@....linux.org.uk>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Terje Bergström <tbergstrom@...dia.com>,
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Subject: Re: [GIT PULL] On-demand device probing

On 20 October 2015 at 18:04, Alan Stern <stern@...land.harvard.edu> wrote:
> On Tue, 20 Oct 2015, Mark Brown wrote:
>
>> On Tue, Oct 20, 2015 at 10:40:03AM -0400, Alan Stern wrote:
>>
>> > Furthermore, that applies only to devices that use synchronous suspend.
>> > Async suspend is becoming common, and there the only restrictions are
>> > parent-child relations plus whatever explicit requirements that drivers
>> > impose by calling device_pm_wait_for_dev().
>>
>> Hrm, this is the first I'd noticed that feature though I see the initial
>> commit dates from January.
>
> Async suspend and device_pm_wait_for_dev() were added in January 2010,
> not 2015!
>
>>  It looks like most of the users are PCs at
>> the minute but we should be using it more widely for embedded things,
>> there's definitely some cases I'm aware of where it will allow us to
>> remove some open coding.
>>
>> It does seem like we want to be feeding dependency information we
>> discover for probing way into the suspend dependencies...
>
> Rafael has been thinking about a way to do this systematically.
> Nothing concrete has emerged yet.

This iteration of the series would make this quite easy, as
dependencies are calculated before probes are attempted:

https://lkml.org/lkml/2015/6/17/311

Regards,

Tomeu

> Alan Stern
>
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