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

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Message-ID: <74CDBE0F657A3D45AFBB94109FB122FF04B73215C9@HQMAIL01.nvidia.com>
Date:	Tue, 20 Sep 2011 09:51:08 -0700
From:	Stephen Warren <swarren@...dia.com>
To:	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	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-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Colin Cross <ccross@...gle.com>
Subject: RE: [PATCH] i2c/tegra: I2C driver uses the
 suspend_noirq/resume_noirq

Stephen Warren wrote at Tuesday, August 30, 2011 10:25 AM:
> Ben, Arnd,
> 
> Could you please ack/nack the patch at the start of this thread for Colin;
> see below.

Ben, can you please comment on the acceptability of this patch?

Or Arnd, did Mark's most recent explanation of the situation provide enough
context for you to ack/nak it?

Thanks.

> Thanks.
> 
> Colin Cross wrote at Wednesday, August 24, 2011 3:34 PM:
> > 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?

--
nvpublic

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