linux-kernel - Re: [PATCH] i2c/tegra: I2C driver uses the suspend_noirq/resume

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Message-ID: <CAMbhsRRRa_JV8_LHEvsM2h3e8Hbf1GAcpXz8gdU3wCc8Jgz5gw@mail.gmail.com>
Date:	Wed, 24 Aug 2011 14:33:59 -0700
From:	Colin Cross <ccross@...gle.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Ben Dooks <ben-linux@...ff.org>, Dilan Lee <dilee@...dia.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] i2c/tegra: I2C driver uses the suspend_noirq/resume_noirq

On Wed, Aug 24, 2011 at 2:28 PM, Stephen Warren <swarren@...dia.com> wrote:
> Mark Brown wrote at Thursday, August 11, 2011 9:15 PM:
>> On Thu, Aug 11, 2011 at 07:59:27PM -0700, Colin Cross wrote:
>> > On Thu, Aug 11, 2011 at 5:45 PM, Mark Brown
>>
>> > > For example with ASoC we'd sort all the components before the ASoC card
>> > > without regard for their bus dependencies or any other dependencies they
>> > > have (eg, their regulators). Since the ASoC card is a platform device
>> > > it's likely to have registered early with no regard for where the buses
>> > > the card needs are registered. I'd expect there's a reasonable chance
>> > > it'll actually make things worse in the short term.
>>
>> > You can't just move everything after the card, you have to move
>> > everything after the last device that was probed, and it only works if
>> > nothing depends on any of the devices that are moved.
>>
>> Sorry, I said that the wrong way round due to trying to reply quickly -
>> the card would be the thing that moves since that's the thing that
>> actually does the suspend but we've *no* idea which device we need to
>> move it after.  Since all the function does is a direct move after or
>> before a single device all we can do is pick one and pray that it's the
>> right device.
>
> Colin,
>
> This thread seems to have died down; how should we make progress?
>
> It sounds like the suspend_irq solution is the current de-facto standard;
> not optimal, but all we really have right now and already in use. I could
> certainly see avoiding this solution if it was the first time it was
> employed, but re-using it seems reasonable to me?
>
> Alternatively, are you attending either Linux Plumbers Conference or the
> Kernel Summit? Mark implied this topic might well come up for discussion
> there. Unfortunately, I won't be able to make LPC due to a conflict.
I don't think I'll be able to make it.

> (and you'd mentioned having the subsystem maintainers weigh in on this;
> which sub-system; IRQ, power, I2C, ...?)

If Ben says its OK, its fine with me.  Or maybe Arnd wants to weigh in?
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