Re: [PATCH] Input: gpio-keys - add hibernation support

[Dmitry Torokhov]

Hi Armando,

On Mon, Apr 06, 2026 at 01:39:10PM -0700, Armando De Leon wrote:
> Hi Dmitry,
> 
> Thanks for the guidance. I investigated further:
> 
> The upstream GICv3 driver (irq-gic-v3.c) has no suspend/resume or
> syscore_ops for the distributor - it does not save or restore any
> per-IRQ configuration across power cycles. On platforms where the
> GIC is re-initialized by firmware during hibernate restore, all
> trigger type configurations set by consumer drivers during probe()
> are lost.
> 
> The IRQ core does preserve the trigger type in irq_data
> (irqd_get_trigger_type), but resume_irq() in kernel/irq/pm.c only
> re-enables the interrupt without re-applying the trigger type to
> hardware.
> 
> A fix in the IRQ PM resume path (having resume_irq() call
> irq_set_irq_type() using the saved trigger type) would fix all
> consumer drivers generically. However, such a change would have
> broad consequences and impact across all platforms and interrupt
> controllers, and would need very careful review and testing.
> 
> Given that the gpio-keys fix is a single irq_set_irq_type() call
> in the .restore callback - minimal, self-contained, and low risk -
> would it be acceptable to handle it at the driver level for now?
> This avoids the risk of a sweeping IRQ core change while solving
> the immediate problem for gpio-keys users with hibernation support.

I am sorry but as I mentioned, the proper fix is in IRQ/irqchip code,
which will ensure that not only gpio-keys but also the rest of the
consumer drivers have consistent state post hibernate.

I understand that you might need your change for a product; I recommend
applying the patch to your internal tree while you are sorting out a
generic solution.

Thanks.

-- 
Dmitry