From: Zixun LI <admin@hifiphile.com>
Date: Wed, 17 May 2023 13:49:45 +0000 (+0200)
Subject: atmel_sdhci: Force card-detect if MMC_CAP_NONREMOVABLE.
X-Git-Tag: v2025.01-rc5-pxa1908~926^2
X-Git-Url: http://git.dujemihanovic.xyz/img/static/gitweb.css?a=commitdiff_plain;h=e83b6f99fc512acda05691db35e7d83817eac0b9;p=u-boot.git

atmel_sdhci: Force card-detect if MMC_CAP_NONREMOVABLE.

If the device attached to the MMC bus is not removable, set force card-detect
bit to bypass card detection procedure, so card detection pin can be used for
other purposes.

It's also a workaround for SAMA5D2 who doesn't drive CMD if using GPIO for card
detection.

Signed-off-by: Zixun LI <zli@ogga.fr>
Reviewed-by: Eugen Hristev <eugen.hristev@collabora.com>
---

diff --git a/drivers/mmc/atmel_sdhci.c b/drivers/mmc/atmel_sdhci.c
index 37b0beeed4..5347ba9043 100644
--- a/drivers/mmc/atmel_sdhci.c
+++ b/drivers/mmc/atmel_sdhci.c
@@ -15,6 +15,9 @@
 #define ATMEL_SDHC_MIN_FREQ	400000
 #define ATMEL_SDHC_GCK_RATE	240000000
 
+#define ATMEL_SDHC_MC1R 0x204
+#define ATMEL_SDHC_MC1R_FCD	0x80
+
 #ifndef CONFIG_DM_MMC
 int atmel_sdhci_init(void *regbase, u32 id)
 {
@@ -52,11 +55,37 @@ struct atmel_sdhci_plat {
 	struct mmc mmc;
 };
 
+static void atmel_sdhci_config_fcd(struct sdhci_host *host)
+{
+	u8 mc1r;
+
+	/* If nonremovable, assume that the card is always present.
+	 *
+	 * WA: SAMA5D2 doesn't drive CMD if using CD GPIO line.
+	 */
+	if ((host->mmc->cfg->host_caps & MMC_CAP_NONREMOVABLE)
+#if CONFIG_IS_ENABLED(DM_GPIO)
+		|| dm_gpio_get_value(&host->cd_gpio) >= 0
+#endif
+	   ) {
+		sdhci_readb(host, ATMEL_SDHC_MC1R);
+		mc1r |= ATMEL_SDHC_MC1R_FCD;
+		sdhci_writeb(host, mc1r, ATMEL_SDHC_MC1R);
+	}
+}
+
 static int atmel_sdhci_deferred_probe(struct sdhci_host *host)
 {
 	struct udevice *dev = host->mmc->dev;
+	int ret;
 
-	return sdhci_probe(dev);
+	ret = sdhci_probe(dev);
+	if (ret)
+		return ret;
+
+	atmel_sdhci_config_fcd(host);
+
+	return 0;
 }
 
 static const struct sdhci_ops atmel_sdhci_ops = {
@@ -120,7 +149,13 @@ static int atmel_sdhci_probe(struct udevice *dev)
 
 	clk_free(&clk);
 
-	return sdhci_probe(dev);
+	ret = sdhci_probe(dev);
+	if (ret)
+		return ret;
+
+	atmel_sdhci_config_fcd(host);
+
+	return 0;
 }
 
 static int atmel_sdhci_bind(struct udevice *dev)