linux-kernel - Re: [PATCH] mfd: axp20x: fix order of pek rise and fall events

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Date:   Wed, 30 Nov 2022 00:43:15 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Aren Moynihan <aren@...cevolution.org>, Lee Jones <lee@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Ondrej Jirman <megi@....cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: axp20x: fix order of pek rise and fall events

On 11/23/22 17:07, Aren Moynihan wrote:
> The power button can get "stuck" if the rising edge and falling edge irq
> are read in the same pass. This can often be triggered when resuming
> from suspend if the power button is released before the kernel handles
> the interrupt.
> 
> Swapping the order of the rise and fall events makes sure that the press
> event is handled first, which prevents this situation.

Indeed. This is probably the simplest solution, but I think it deserves
a comment in at least one place that the order intentionally mismatches
the order of the bits in the register.

> Signed-off-by: Aren Moynihan <aren@...cevolution.org>
> ---
>  include/linux/mfd/axp20x.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
> index 9ab0e2fca7ea..a13ba2bdd01f 100644
> --- a/include/linux/mfd/axp20x.h
> +++ b/include/linux/mfd/axp20x.h
> @@ -432,8 +432,8 @@ enum {
>  	AXP152_IRQ_PEK_SHORT,
>  	AXP152_IRQ_PEK_LONG,
>  	AXP152_IRQ_TIMER,
> -	AXP152_IRQ_PEK_RIS_EDGE,
>  	AXP152_IRQ_PEK_FAL_EDGE,
> +	AXP152_IRQ_PEK_RIS_EDGE,
>  	AXP152_IRQ_GPIO3_INPUT,
>  	AXP152_IRQ_GPIO2_INPUT,
>  	AXP152_IRQ_GPIO1_INPUT,
> @@ -472,8 +472,8 @@ enum {
>  	AXP20X_IRQ_LOW_PWR_LVL1,
>  	AXP20X_IRQ_LOW_PWR_LVL2,
>  	AXP20X_IRQ_TIMER,
> -	AXP20X_IRQ_PEK_RIS_EDGE,
>  	AXP20X_IRQ_PEK_FAL_EDGE,
> +	AXP20X_IRQ_PEK_RIS_EDGE,
>  	AXP20X_IRQ_GPIO3_INPUT,
>  	AXP20X_IRQ_GPIO2_INPUT,
>  	AXP20X_IRQ_GPIO1_INPUT,
> @@ -502,8 +502,8 @@ enum axp22x_irqs {
>  	AXP22X_IRQ_LOW_PWR_LVL1,
>  	AXP22X_IRQ_LOW_PWR_LVL2,
>  	AXP22X_IRQ_TIMER,
> -	AXP22X_IRQ_PEK_RIS_EDGE,
>  	AXP22X_IRQ_PEK_FAL_EDGE,
> +	AXP22X_IRQ_PEK_RIS_EDGE,
>  	AXP22X_IRQ_GPIO1_INPUT,
>  	AXP22X_IRQ_GPIO0_INPUT,
>  };
> @@ -571,8 +571,8 @@ enum axp803_irqs {
>  	AXP803_IRQ_LOW_PWR_LVL1,
>  	AXP803_IRQ_LOW_PWR_LVL2,
>  	AXP803_IRQ_TIMER,
> -	AXP803_IRQ_PEK_RIS_EDGE,
>  	AXP803_IRQ_PEK_FAL_EDGE,
> +	AXP803_IRQ_PEK_RIS_EDGE,
>  	AXP803_IRQ_PEK_SHORT,
>  	AXP803_IRQ_PEK_LONG,
>  	AXP803_IRQ_PEK_OVER_OFF,
> @@ -623,8 +623,8 @@ enum axp809_irqs {
>  	AXP809_IRQ_LOW_PWR_LVL1,
>  	AXP809_IRQ_LOW_PWR_LVL2,
>  	AXP809_IRQ_TIMER,
> -	AXP809_IRQ_PEK_RIS_EDGE,
>  	AXP809_IRQ_PEK_FAL_EDGE,
> +	AXP809_IRQ_PEK_RIS_EDGE,
>  	AXP809_IRQ_PEK_SHORT,
>  	AXP809_IRQ_PEK_LONG,
>  	AXP809_IRQ_PEK_OVER_OFF,

You should also update APX288 and APX806, which name the IRQs "POK"
instead of "PEK" for some reason.

Regards,
Samuel