resume regression in 2.6.37

Lars-Peter Clausen
2011-01-17T19:59:56Z

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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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