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

[ziniu.wang_1 at nxp.com]

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.

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