Re: [BISECTED] v4.4-rc1 GPIO regression on OMAP1

[Grygorii Strashko <grygorii.strashko@ti.com>]

On 11/18/2015 08:31 PM, Aaro Koskinen wrote:
> Hi,
> 
> On Wed, Nov 18, 2015 at 02:58:38PM +0200, Grygorii Strashko wrote:
>> On 11/17/2015 11:42 PM, Aaro Koskinen wrote:
>>> Amstrad E3 computer (OMAP1) boot crashes early with v4.4-rc1. Bisected to:
>>>
>>> 	450fa54cfd66e3dda6eda26256637ee8928af12a is the first bad commit
>>> 	commit 450fa54cfd66e3dda6eda26256637ee8928af12a
>>> 	Author: Grygorii Strashko <grygorii.strashko@ti.com>
>>> 	Date:   Fri Sep 25 12:28:03 2015 -0700
>>> 	
>>> 	    gpio: omap: convert to use generic irq handler
>>
>> Could you check pls if below change will solve this issue, pls?
>>
>> iff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
>> index 56d2d02..2905e0d 100644
>> --- a/drivers/gpio/gpio-omap.c
>> +++ b/drivers/gpio/gpio-omap.c
>> @@ -1129,7 +1129,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank,
>> struct irq_chip *irqc)
>>          }
>>
>>          ret = gpiochip_irqchip_add(&bank->chip, irqc,
>> -                                  irq_base, handle_bad_irq,
>> +                                  irq_base, handle_simple_irq,
>>                                     IRQ_TYPE_NONE);
> 

Thanks for testing it. But I'd like to ask you for more help here if possible :)
Above change is expected to fix the OMAP1 boot, but looking at the OMAP GPIO code
I think that MPUIO IRQ are not working :( and this functionality has been broken 
long time ago - commit "gpio: omap: convert to use generic irq handler" has just 
made hidden issue visible.
(I've found only one OMAP1 board which uses MPUIO GPIO as IRQ (board-osk.c)).

So, could I ask you to test another change instead of previous one?

--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -1122,8 +1122,6 @@ static int omap_gpio_chip_init(struct gpio_bank *bank, struct irq_chip *irqc)
        /* MPUIO is a bit different, reading IRQ status clears it */
        if (bank->is_mpuio) {
                irqc->irq_ack = dummy_irq_chip.irq_ack;
-               irqc->irq_mask = irq_gc_mask_set_bit;
-               irqc->irq_unmask = irq_gc_mask_clr_bit;
                if (!bank->regs->wkup_en)
                        irqc->irq_set_wake = NULL;
        }

In my opinion real test will be
- request(any MPUIO GPIO IRQ, IRQF_TRIGGER_LOW/HIGH), 
- trigger MPUIO GPIO IRQ
- free(MPUIO GPIO IRQ)




-- 
regards,
-grygorii