mmc: sdhci_am654: Add SDHCI_QUIRK2_SUPPRESS_V1P8_ENA quirk to am62 compatible

Add a new struct for platform data for the ti,am62-sdhci compatible to
apply additional quirks, namely "SDHCI_QUIRK2_SUPPRESS_V1P8_ENA", to
host controllers with am62 compatible.

Note, the fix was originally introduced by commit 941a7ab
("mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch") but was
found to be applied too broadly and had to be reverted.

This fixes MMC init failures seen across am62x boards.

Fixes: ac5a41b ("Revert "mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch"")
Fixes: 941a7ab ("mmc: sdhci_am654: Add sdhci_am654_start_signal_voltage_switch")
Cc: stable@vger.kernel.org
Suggested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Judith Mendez <jm@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20250516203121.3736379-1-jm@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: jmenti

drivers/mmc/host/sdhci_am654.c

@@ -155,6 +155,7 @@ struct sdhci_am654_data {
 	u32 tuning_loop;
 
 #define SDHCI_AM654_QUIRK_FORCE_CDTEST BIT(0)
+#define SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA BIT(1)
 };
 
 struct window {
@@ -166,6 +167,7 @@ struct window {
 struct sdhci_am654_driver_data {
 	const struct sdhci_pltfm_data *pdata;
 	u32 flags;
+	u32 quirks;
 #define IOMUX_PRESENT	(1 << 0)
 #define FREQSEL_2_BIT	(1 << 1)
 #define STRBSEL_4_BIT	(1 << 2)
@@ -356,6 +358,29 @@ static void sdhci_j721e_4bit_set_clock(struct sdhci_host *host,
 	sdhci_set_clock(host, clock);
 }
 
+static int sdhci_am654_start_signal_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
+	int ret;
+
+	if ((sdhci_am654->quirks & SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA) &&
+	    ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
+		if (!IS_ERR(mmc->supply.vqmmc)) {
+			ret = mmc_regulator_set_vqmmc(mmc, ios);
+			if (ret < 0) {
+				pr_err("%s: Switching to 1.8V signalling voltage failed,\n",
+				       mmc_hostname(mmc));
+				return -EIO;
+			}
+		}
+		return 0;
+	}
+
+	return sdhci_start_signal_voltage_switch(mmc, ios);
+}
+
 static u8 sdhci_am654_write_power_on(struct sdhci_host *host, u8 val, int reg)
 {
 	writeb(val, host->ioaddr + reg);
@@ -650,6 +675,12 @@ static const struct sdhci_am654_driver_data sdhci_j721e_4bit_drvdata = {
 	.flags = IOMUX_PRESENT,
 };
 
+static const struct sdhci_am654_driver_data sdhci_am62_4bit_drvdata = {
+	.pdata = &sdhci_j721e_4bit_pdata,
+	.flags = IOMUX_PRESENT,
+	.quirks = SDHCI_AM654_QUIRK_SUPPRESS_V1P8_ENA,
+};
+
 static const struct soc_device_attribute sdhci_am654_devices[] = {
 	{ .family = "AM65X",
 	  .revision = "SR1.0",
@@ -872,7 +903,7 @@ static const struct of_device_id sdhci_am654_of_match[] = {
 	},
 	{
 		.compatible = "ti,am62-sdhci",
-		.data = &sdhci_j721e_4bit_drvdata,
+		.data = &sdhci_am62_4bit_drvdata,
 	},
 	{ /* sentinel */ }
 };
@@ -906,6 +937,7 @@ static int sdhci_am654_probe(struct platform_device *pdev)
 	pltfm_host = sdhci_priv(host);
 	sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
 	sdhci_am654->flags = drvdata->flags;
+	sdhci_am654->quirks = drvdata->quirks;
 
 	clk_xin = devm_clk_get(dev, "clk_xin");
 	if (IS_ERR(clk_xin)) {
@@ -940,6 +972,7 @@ static int sdhci_am654_probe(struct platform_device *pdev)
 		goto err_pltfm_free;
 	}
 
+	host->mmc_host_ops.start_signal_voltage_switch = sdhci_am654_start_signal_voltage_switch;
 	host->mmc_host_ops.execute_tuning = sdhci_am654_execute_tuning;
 
 	pm_runtime_get_noresume(dev);