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Date:	Mon, 17 Jan 2011 20:59:56 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Daniel Mack <daniel@...aq.de>,
	Sven Neumann <s.neumann@...mfeld.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: resume regression in 2.6.37

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On 01/17/2011 08:24 PM, Lars-Peter Clausen wrote:
> On 01/17/2011 01:40 PM, Thomas Gleixner wrote:
>> On Mon, 17 Jan 2011, Sven Neumann wrote:
> 
>>> On Thu, 2011-01-13 at 18:33 +0100, Thomas Gleixner wrote:
>>>
>>>>> 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.
>>>
>>> pxa3xx_set_wake(31, 1) returns 0
>>>
>>> Same result with stock 2.6.37 and the patch reverted. Except that
>>> without the patch reverted, the device doesn't power up again.
> 
>> Ok, can we agree that the patch has no functional impact on the
>> set_wake function? And I don't see a reason why reverting that patch
>> results in a working resume. That does not make sense at all. Which
>> compiler version are you using ?
> 
>> Thanks,
> 
>> 	tglx
> 
> 
> Hi
> 
> If you take a look at the pxa gpio irq handling you'll see that it sets the
> "set_wake" field of it's irq_chip after calling set_irq_chip for all of the irqs, so
> the compat handler gets never installed.
> 
> So I guess the following patch fixes it:
> 
> diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
> --- a/arch/arm/mach-pxa/irq.c
> +++ b/arch/arm/mach-pxa/irq.c
> @@ -111,13 +111,13 @@ static void __init pxa_init_low_gpio_irq(set_wake_t fn)
>  	GRER0 &= ~0x3;
>  	GEDR0 = 0x3;
> 
> +	pxa_low_gpio_chip.set_wake = fn;
> +
>  	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
>  		set_irq_chip(irq, &pxa_low_gpio_chip);
>  		set_irq_handler(irq, handle_edge_irq);
>  		set_irq_flags(irq, IRQF_VALID);
>  	}
> -
> -	pxa_low_gpio_chip.set_wake = fn;
>  }
> 
>  void __init pxa_init_irq(int irq_nr, set_wake_t fn)
> @@ -142,13 +142,14 @@ void __init pxa_init_irq(int irq_nr, set_wake_t fn)
>  	/* only unmasked interrupts kick us out of idle */
>  	ICCR = 1;
> 
> +	pxa_internal_irq_chip.set_wake = fn;
> +
>  	for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
>  		set_irq_chip(irq, &pxa_internal_irq_chip);
>  		set_irq_handler(irq, handle_level_irq);
>  		set_irq_flags(irq, IRQF_VALID);
>  	}
> 
> -	pxa_internal_irq_chip.set_wake = fn;
>  	pxa_init_low_gpio_irq(fn);
>  }
> 
and

diff --git a/arch/arm/mach-pxa/pxa3xx.c b/arch/arm/mach-pxa/pxa3xx.c
index d1c747c..6fc8281 100644
- --- a/arch/arm/mach-pxa/pxa3xx.c
+++ b/arch/arm/mach-pxa/pxa3xx.c
@@ -558,13 +558,13 @@ static void __init pxa_init_ext_wakeup_irq(set_wake_t fn)
 {
 	int irq;

+	pxa_ext_wakeup_chip.set_wake = fn;
+
 	for (irq = IRQ_WAKEUP0; irq <= IRQ_WAKEUP1; irq++) {
 		set_irq_chip(irq, &pxa_ext_wakeup_chip);
 		set_irq_handler(irq, handle_edge_irq);
 		set_irq_flags(irq, IRQF_VALID);
 	}
- -
- -	pxa_ext_wakeup_chip.set_wake = fn;
 }

 void __init pxa3xx_init_irq(void)
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