From: Haibo Chen <haibo.chen@nxp.com>
Date: Wed, 27 May 2020 10:39:35 +0800
Subject: mmc: host: sdhci-esdhc-imx: add wakeup feature for GPIO CD pin
Git-commit: f61404626113080863c904a459576ba0c03a49ba
Patch-mainline: v5.8-rc1
References: jsc#SLE-16106

When use the specific GPIO to detect the card insert/remove, we can
also add the GPIO as a wakeup source. When system suspend, insert or
remove the card can wakeup the system.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://lore.kernel.org/r/1590547175-15070-1-git-send-email-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 5398af4824c3..5a27511438c8 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1599,6 +1599,10 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
 	if (esdhc_is_usdhc(imx_data)) {
 		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
 		host->mmc->caps |= MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR;
+
+		/* GPIO CD can be set as a wakeup source */
+		host->mmc->caps |= MMC_CAP_CD_WAKE;
+
 		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
 			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
 
@@ -1734,8 +1738,14 @@ static int sdhci_esdhc_suspend(struct device *dev)
 		mmc_retune_needed(host->mmc);
 
 	ret = sdhci_suspend_host(host);
-	if (!ret)
-		return 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);
 
 	return ret;
 }
@@ -1759,6 +1769,9 @@ static int sdhci_esdhc_resume(struct device *dev)
 	if (host->mmc->caps2 & MMC_CAP2_CQE)
 		ret = cqhci_resume(host->mmc);
 
+	if (!ret)
+		ret = mmc_gpio_set_cd_wake(host->mmc, false);
+
 	return ret;
 }
 #endif