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

[Bough Chen]

> -----Original Message-----
> From: Frank Li <frank.li at nxp.com>
> Sent: 2025年5月21日 23:56
> To: Luke Wang <ziniu.wang_1 at nxp.com>
> Cc: Bough Chen <haibo.chen at nxp.com>; adrian.hunter at intel.com;
> ulf.hansson at linaro.org; linux-mmc at vger.kernel.org; shawnguo at kernel.org;
> s.hauer at pengutronix.de; kernel at pengutronix.de; festevam at gmail.com;
> imx at lists.linux.dev; dl-S32 <S32 at nxp.com>;
> linux-arm-kernel at lists.infradead.org; linux-kernel at vger.kernel.org
> Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: do not change pinctrl state in
> suspend if function irq is wakeup source
> 
> 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?

Hi Frank,

I double check the power team, on imx93-11x11-evk board, For SD card on usdhc2, switch the PAD to gpio function will save about 3~4mw,
For SDIO wifi on usdhc3, switch the PAD to gpio function will save about 0.8~1mw. (without wakeup)

Regards
Haibo Chen
> 
> 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
> >