linux-kernel - Re: Boot regression on Mackerel with current mainline

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Date:	Wed, 4 Jul 2012 11:39:07 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	linux-sh@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chris Ball <cjb@...top.org>
Subject: Re: Boot regression on Mackerel with current mainline

On Tue, 3 Jul 2012, Rafael J. Wysocki wrote:

> On Tuesday, July 03, 2012, Guennadi Liakhovetski wrote:
> > Hi Rafael
> > 
> > On Tue, 3 Jul 2012, Rafael J. Wysocki wrote:
> > 
> > > Hi,
> > > 
> > > We seem to have a functional regression on Mackerel with 3.5-rc5 which
> > > seems to be related to SDHI.  Namely, the SDHI driver appears to wait forever
> > > for the devices to appear and commenting out all of the sdhi devices in the
> > > board file works around the problem.
> > > 
> > > I can investigate some more later today if need be.
> > 
> > Have you checked the logs? Are you seeing any of these in the kernel log:
> > 
> > genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 
> 
> I see this only once per boot, but then sh_mobile_sdhi is saying "timeout
> waiting for hardware interrupt" pretty much continuously.

Yes, that's the one. Ok, let's fix it in the driver. In fact, a fix has 
already been submitted, but for 3.6. I hoped, 3.5 would resort to a softer 
form of the ONESHOT failing, so, I didn't push it for -rc. I think, the 
easiest would be to apply these two patches:

"mmc: tmio: use MMC opcode defines instead of numbers"
http://git.kernel.org/?p=linux/kernel/git/cjb/mmc.git;a=commit;h=598cd9cc217b0aa46089a3838a8b1c37b97aa08b

and

"mmc: extend and rename cd-gpio helpers to handle more slot GPIO functions"
http://git.kernel.org/?p=linux/kernel/git/cjb/mmc.git;a=commit;h=d8e60fb51effc83e6f53de191a8440f46e5a3f2c

The latter one looks big because of a rename, but with "-M" it's pretty 
trivial. Chris, do you agree?

Thanks
Guennadi

> > with an IRQ number at the end? If so, then this is a known problem, which 
> > I'd hoped would have been long fixed by now:
> > 
> > https://lkml.org/lkml/2012/6/12/151
> > 
> > We can nommit a fix for it in mmc, or we can try to re-ping Thomas - if 
> > this is indeed the bug, you're getting...
> 
> I guess it is, but having reviewed the above e-mail thread I don't think any
> fix from Thomas is going to appear.  So, please fix that in MMC, if possible.
> 
> Thanks,
> Rafael
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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