[PATCH] mmc: sdhci-esdhc-imx: do not change pinctrl state in suspend if function irq is wakeup source

[Frank Li]

On Wed, May 21, 2025 at 11:31:34AM +0800, ziniu.wang_1 at nxp.com wrote:
> From: Haibo Chen <haibo.chen at nxp.com>
>
> pinctrl sleep state may config the pin mux to certain function to save
> power in system PM. But if usdhc is setting as wakeup source, like
> the card interrupt(SDIO) or card insert interrupt, it depends on the
> related pin mux configured to usdhc function pad.
> e.g. To support card interrupt(SDIO interrupt), it need the pin is
> config as usdhc DATA[1] function pin.

I think it should be dts settings wrong. Does one PAD set as function
impact power much?

Frank

>
> Find the issue on imx93-11x11-evk board, SDIO WiFi in band interrupt
> can't wakeup system because the pinctrl sleep state config the DATA[1]
> pin as GPIO function.
>
> For this case, do not change the pinctrl state in suspend.
>
> Signed-off-by: Haibo Chen <haibo.chen at nxp.com>
> Signed-off-by: Luke Wang <ziniu.wang_1 at nxp.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 5f1c45b2bd5d..f206b562a6e3 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -2057,12 +2057,20 @@ static int sdhci_esdhc_suspend(struct device *dev)
>  		ret = sdhci_enable_irq_wakeups(host);
>  		if (!ret)
>  			dev_warn(dev, "Failed to enable irq wakeup\n");
> +	} else {
> +		/*
> +		 * For the device which works as wakeup source, no need
> +		 * to change the pinctrl to sleep state.
> +		 * e.g. For SDIO device, the interrupt share with data pin,
> +		 * but the pinctrl sleep state may config the data pin to
> +		 * other function like GPIO function to save power in PM,
> +		 * which finally block the SDIO wakeup function.
> +		 */
> +		ret = pinctrl_pm_select_sleep_state(dev);
> +		if (ret)
> +			return ret;
>  	}
>
> -	ret = pinctrl_pm_select_sleep_state(dev);
> -	if (ret)
> -		return ret;
> -
>  	ret = mmc_gpio_set_cd_wake(host->mmc, true);
>
>  	/*
> --
> 2.34.1
>