[PATCH v3] pinctrl: sunxi: fix gpiochip_lock_as_irq() failure when pinmux is unknown

[Andre Przywara]

Hi,

On 3/19/26 15:06, Chen-Yu Tsai wrote:
> On Thu, Mar 19, 2026 at 9:46 PM Linus Walleij <linusw at kernel.org> wrote:
>>
>> On Sat, Mar 14, 2026 at 9:10 AM Michal Piekos
>> <michal.piekos at mmpsystems.pl> wrote:
>>
>>> Fixes kernel hang during boot due to inability to set up IRQ on AXP313a.
>>>
>>> The issue is caused by gpiochip_lock_as_irq() which is failing when gpio
>>> is in unitialized state.
>>>
>>> Solution is to set pinmux to GPIO INPUT in
>>> sunxi_pinctrl_irq_request_resources() if it wasn't initialized
>>> earlier.
>>>
>>> Tested on Orange Pi Zero 3.
>>>
>>> Signed-off-by: Michal Piekos <michal.piekos at mmpsystems.pl>
>>> Suggested-by: Chen-Yu Tsai <wens at kernel.org>
>>
>> Should this have a Fixes: tag and should it be applied as an urgent fix?
> 
> Fixes: 01e10d0272b9 ("pinctrl: sunxi: Implement gpiochip::get_direction()")
> 
>> Tag for stable?
> 
> The original patch wasn't tagged for stable. And it doesn't seem like it
> was auto picked.
> 
>> Also: is there consensus with Andre that this is the way to proceed?
> 
> As Andre mentioned, the mux value for "disabled" is different between
> generations. So we likely need to make the value part of
> |struct sunxi_pinctrl_desc|.

There is already the SUNXI_PINCTRL_NEW_REG_LAYOUT flag, which describes 
exactly that: the new layout increased the bit field to 4 bits, moving 
the HiZ value to 0xf.
But it's just a flag passed to sunxi_pinctrl_init_with_flags(), not 
stored in desc, and not available during runtime. Which is what I tried 
to fix for my A733 series:
https://lore.kernel.org/linux-arm-kernel/20250821004232.8134-3-andre.przywara@arm.com/

So maybe we can cherry-pick just this patch, then check for that flag?

Cheers,
Andre

> 
> Michal, can you respin a version so that we can get this fixed in the
> same release?
> 
> 
> ChenYu
>