Some samples of the Milk-V Duo and Duo 256M have issues with SD card
communication. As a result, the SD card is not detected, or the correct
mode is not selected.
Configure SDHCI PHY in the same way as in downstream, to ensure
that the PHY is initialized properly.
Fixes: eb36f28ff721 ("mmc: cv1800b: Add sdhci driver support for cv1800b SoC")
Signed-off-by: Andrei Lalaev <[email protected]>
Link:
https://lore.kernel.org/u-boot/[email protected]/
---
drivers/mmc/cv1800b_sdhci.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/mmc/cv1800b_sdhci.c b/drivers/mmc/cv1800b_sdhci.c
index b756649f90f3..5c129682daba 100644
--- a/drivers/mmc/cv1800b_sdhci.c
+++ b/drivers/mmc/cv1800b_sdhci.c
@@ -8,11 +8,17 @@
#include <sdhci.h>
#include <linux/delay.h>
+#define CV18XX_SDHCI_MSHC_CTRL 0x200
+#define CV18XX_SDHCI_PHY_CONFIG 0x24c
#define SDHCI_PHY_TX_RX_DLY 0x240
#define MMC_MAX_CLOCK 375000000
#define TUNE_MAX_PHCODE 128
#define PHY_TX_SRC_INVERT BIT(8)
+#define PHY_RX_SRC_INVERT BIT(24)
+
+#define CV18XX_LATANCY_1T BIT(1)
+#define CV18XX_PHY_TX_BPS BIT(0)
struct cv1800b_sdhci_plat {
struct mmc_config cfg;
@@ -64,10 +70,29 @@ static int cv1800b_execute_tuning(struct mmc *mmc, u8
opcode)
}
#endif
+static int cv1800b_deferred_probe(struct sdhci_host *host)
+{
+ u32 val;
+
+ val = sdhci_readl(host, CV18XX_SDHCI_MSHC_CTRL);
+ val |= CV18XX_LATANCY_1T;
+ sdhci_writel(host, val, CV18XX_SDHCI_MSHC_CTRL);
+
+ val = sdhci_readl(host, CV18XX_SDHCI_PHY_CONFIG);
+ val |= CV18XX_PHY_TX_BPS;
+ sdhci_writel(host, val, CV18XX_SDHCI_PHY_CONFIG);
+
+ val = PHY_TX_SRC_INVERT | PHY_RX_SRC_INVERT;
+ sdhci_writel(host, val, SDHCI_PHY_TX_RX_DLY);
+
+ return 0;
+}
+
const struct sdhci_ops cv1800b_sdhci_sd_ops = {
#if CONFIG_IS_ENABLED(MMC_SUPPORTS_TUNING)
.platform_execute_tuning = cv1800b_execute_tuning,
#endif
+ .deferred_probe = cv1800b_deferred_probe,
};
static int cv1800b_sdhci_bind(struct udevice *dev)
---
base-commit: 509312dc5386ff4c5adabf53a573abca0aac4ce5
change-id: 20260907-milkv-duo-sdhci-configure-aa9790c73d0b
Best regards,
--
Andrei Lalaev <[email protected]>
