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

[Luke Wang]

> -----Original Message-----
> From: Frank Li <frank.li at nxp.com>
> Sent: Friday, May 23, 2025 2:29 AM
> To: Bough Chen <haibo.chen at nxp.com>
> Cc: Luke Wang <ziniu.wang_1 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 Thu, May 22, 2025 at 03:16:11AM +0000, Bough Chen wrote:
> > > -----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)
> 
> Okay, I think it should be add new pinctrl state ("wakeup"), only set
> DATA[0,2,3]
> to GPIO and SET DATA[1] to sd function.
> 
> You can change pad setting to "wakeup" state if wake up enabled.
> 

Hi Frank,

Adding new pinctrl state will bring both driver and dts changes.
What about we only change sleep pinctrl DATA[1] to sd function for SDIO?

Regards
Luke

> Frank
> 
> >
> > 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
> > > >