mmc: sdhci-tegra: Enable wake on SD card event

Enable GPIO wake source on SD card detect line. Physical card
insertion/removal event should wake the system from suspend.
Signed-off-by: Aniruddha Rao <anrao@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/1642050969-21152-1-git-send-email-anrao@nvidia.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-tegra.c

@@ -1673,6 +1673,9 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 	/* HW busy detection is supported, but R1B responses are required. */
 	host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_NEED_RSP_BUSY;
 
+	/* GPIO CD can be set as a wakeup source */
+	host->mmc->caps |= MMC_CAP_CD_WAKE;
+
 	tegra_sdhci_parse_dt(host);
 
 	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
@@ -1840,7 +1843,7 @@ static int sdhci_tegra_suspend(struct device *dev)
 		return ret;
 	}
 
-	return 0;
+	return mmc_gpio_set_cd_wake(host->mmc, true);
 }
 
 static int sdhci_tegra_resume(struct device *dev)
@@ -1848,6 +1851,10 @@ static int sdhci_tegra_resume(struct device *dev)
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	int ret;
 
+	ret = mmc_gpio_set_cd_wake(host->mmc, false);
+	if (ret)
+		return ret;
+
 	ret = pm_runtime_force_resume(dev);
 	if (ret)
 		return ret;