linux-kernel - [PATCH] mmc: tegra: Enable wake on SD card event

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Date:   Thu, 13 Jan 2022 10:46:09 +0530
From:   Aniruddha Rao <anrao@...dia.com>
To:     <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <p.zabel@...gutronix.de>
CC:     <linux-mmc@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <anrao@...dia.com>
Subject: [PATCH] mmc: 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@...dia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 35ebba0..5c84bd5 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/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;
-- 
2.7.4