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

[Dmitry Torokhov]

On Mon, Apr 06, 2026 at 09:58:06AM -0700, Armando De Leon wrote:
> Hi Dmitry,
> 
> Thank you for the review.
> 
> The interrupt controller (GICv3) is re-initialized by platform
> firmware during hibernate restore - this is expected behavior, not
> a bug. The IRQ trigger type (EDGE_BOTH) was originally configured
> by devm_request_any_context_irq() during probe(), which does not
> run again after hibernate restore.
> 
> The TLMM/pinctrl registers are correctly saved and restored by the
> platform's syscore_ops - I verified this with register dumps. The
> issue is specifically that the IRQ trigger type configured at the
> GIC level during probe is lost and not re-applied.
> 
> Should the generic IRQ core be responsible for restoring trigger
> types across hibernate? Otherwise, consumer drivers like gpio-keys need to handle
> this in their .restore callback.

I am not sure if it is job of IRQ core vs. particular interrupt
controller, but they should restore the trigger types along with
entirety of the interrupts and pins states to exactly the same condition
that they were before entering hibernation.

> 
> Either way, gpio-keys currently lacks .freeze/.restore callbacks
> entirely, which is needed for proper hibernation support.

Drivers only need dedicated freeze and restore handlers if the behavior
should be different between suspend-to-ram vs suspend-to-disk. For the
vast majority of the drivers they behave exactly the same and I do not
see why it would be different for gpio-keys.

Thanks.

-- 
Dmitry