linux-kernel - Re: resume regression in 2.6.37

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Date:	Thu, 13 Jan 2011 18:33:41 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Sven Neumann <s.neumann@...mfeld.com>
cc:	Daniel Mack <daniel@...aq.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: resume regression in 2.6.37

On Thu, 13 Jan 2011, Sven Neumann wrote:
> On Thu, 2011-01-13 at 17:28 +0100, Thomas Gleixner wrote:
> > On Thu, 13 Jan 2011, Sven Neumann wrote:
> > > Any idea on how to proceed from here? I don't think I can just revert
> > > this commit and expect things to work, right?
> > 
> > Well, I somehow doubt, that this is the real culprit. The patch does
> > not change anything of the set_wake() functionality. It's a functional
> > equivivalent wrapper, nothing else.
> > 
> > Can you revert it on top of 2.6.37 and verify that it helps ?
> 
> I've done that now and while it doesn't solve the problem completely, I
> can definitely say that reverting the change does make a difference. 

Hmm. I have to admit that this confuses the hell out of me.

> Without the revert there is absolutely no sign of resume. With the
> change reverted I can see that the PXA powers up again, there's an LED
> showing that the USB controller has power again. Unfortunately there's
> seems to be another problem and the resume doesn't complete. I've tried
> to get console output by using no_console_suspend, but there's just
> gibberish on the console after resume :(
> 
> Any idea on how to proceed from here? I could perhaps ask our hardware
> engineer to try find out where exactly we are stuck in the resume. But
> I'd like to avoid that if possible.

Can you stick a printk into the set_wake() function of that irq chip
and print the irq and on arguments and the return value . Run that
with both stock 2.6.37 and the patch reverted.

Thanks,

	tglx


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