[PATCH 1/1] gpio: mxc: map Both Edge pad wakeup to Rising Edge

[Peng Fan (OSS)]

Hi Shenwei,

> Subject: [PATCH 1/1] gpio: mxc: map Both Edge pad wakeup to Rising
> Edge
> 
> Suspend may fail on i.MX8QM when Falling Edge is used as a pad
> wakeup trigger due to a hardware bug in the detection logic. 

This hardware bug exists on i.MX8QM/QXP/DXL, or just 8QM?

More information better to add why suspend may fail.
Do you mean not able to resume back because of failing
to detect falling edge?

Since the
> hardware does not support Both Edge wakeup, remap requests for
> Both Edge to Rising Edge by default to avoid hitting this issue.
> 
> Fixes: f60c9eac54af ("gpio: mxc: enable pad wakeup on i.MX8x
> platforms")
> cc: stable at vger.kernel.org
> Signed-off-by: Shenwei Wang <shenwei.wang at nxp.com>
> ---
>  drivers/gpio/gpio-mxc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c index
> d7666fe9dbf8..f8300690ac05 100644
> --- a/drivers/gpio/gpio-mxc.c
> +++ b/drivers/gpio/gpio-mxc.c
> @@ -589,7 +589,7 @@ static bool mxc_gpio_set_pad_wakeup(struct
> mxc_gpio_port *port, bool enable)
>  		IMX_SCU_WAKEUP_OFF,		/* 0 */
>  		IMX_SCU_WAKEUP_RISE_EDGE,	/*
> IRQ_TYPE_EDGE_RISING */
>  		IMX_SCU_WAKEUP_FALL_EDGE,	/*
> IRQ_TYPE_EDGE_FALLING */
> -		IMX_SCU_WAKEUP_FALL_EDGE,	/*
> IRQ_TYPE_EDGE_BOTH */
> +		IMX_SCU_WAKEUP_RISE_EDGE,	/*
> IRQ_TYPE_EDGE_BOTH */

For IRQ_TYPE_EDGE_BOTH, use IMX_SCU_WAKEUP_RISE_EDGE.
Do we need to also add a check for IRQ_TYPE_EDGE_FALLING?
Saying not support IRQ_TYPE_EDGE_FALLING because of xxx.

Regards
Peng.

>  		IMX_SCU_WAKEUP_HIGH_LVL,	/*
> IRQ_TYPE_LEVEL_HIGH */
>  		IMX_SCU_WAKEUP_OFF,		/* 5 */
>  		IMX_SCU_WAKEUP_OFF,		/* 6 */
> --
> 2.43.0