linux-kernel - Re: [PATCH v8 1/5] PM / Runtime: Add getter for querying the IRQ safe option

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Date:	Fri, 31 Oct 2014 10:54:58 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Jonathan Corbet <corbet@....net>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dmaengine@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v8 1/5] PM / Runtime: Add getter for querying the IRQ safe option

On 31 October 2014 10:33, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Oct 31, 2014 at 10:29:36AM +0100, Ulf Hansson wrote:
>> On 31 October 2014 10:14, Krzysztof Kozlowski <k.kozlowski@...sung.com> wrote:
>> > On pon, 2014-10-20 at 11:04 +0200, Krzysztof Kozlowski wrote:
>> >> Add a simple getter pm_runtime_is_irq_safe() for querying whether runtime
>> >> PM IRQ safe was set or not.
>> >>
>> >> Various bus drivers implementing runtime PM may use choose to suspend
>> >> differently based on IRQ safeness status of child driver (e.g. do not
>> >> unprepare the clock if IRQ safe is not set).
>> >>
>> >> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>> >> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
>> >
>> > Rafael, Len, Pavel,
>> >
>> > Is proposed API ok? Do you have any comments?
>> >
>> > I'll upload whole patchset to Russell's patch tracking system. However
>> > an ack from PM maintainer is probably needed.
>>
>> I would actually prefer the opposite. It's better if we can take these
>> patches through Rafaels tree.
>>
>> 1) I have posted patches for the amba bus, these may have merge
>> conflicts with your changes.
>> 2) We may start using the new runtime PM API within genpd as of now.
>
> Stop this broken thinking.  The solution is simple.
>
> Put the generic runtime PM changes into the PM tree in a separate /clean/
> branch.  Merge them into the PM-next branch.  Notify me where I can
> pull that /clean/ branch.
>
> I pull that clean branch into my tree, and then apply the AMBA specific
> patches on top.
>
> That means Rafael has the PM changes, I have the dependent PM changes,
> and I also have the AMBA changes, and no one ends up carrying changes
> which are inappropriate.

Okay, I have no concerns with this approach.

I have also checked the potential upcoming merge conflict in the amba
bus, since I doubt you will pull in bigger changes from his tree!?
Anyway, that conflict should be trivial to resolve if that happens.

Kind regards
Uffe
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