drivers: sdmmc_stm32: Fix bus width initialization sequence

Fix SDMMC initialization by starting with 1-bit bus mode and
properly configuring wide bus operation after HAL
initialization.

The SDMMC protocol requires initialization to start in
1-bit mode before switching to wider bus widths.
Previously, the driver attempted to initialize directly
with the target bus width, which could cause later read/write
failures.

Changes:
- Initialize with SDMMC_BUS_WIDE_1B instead of target bus width
- Add HAL_SD_ConfigWideBusOperation() call if needed after
successful init
- Add error logging for wide bus configuration failures

Fixes potential SDMMC read/write failures issues on STM32 platforms.

Signed-off-by: Shan Pen <[email protected]>

Author: bricle

drivers/disk/sdmmc_stm32.c

@@ -47,6 +47,14 @@ LOG_MODULE_REGISTER(stm32_sdmmc, CONFIG_SDMMC_LOG_LEVEL);
 #define SDMMC_BUS_WIDE_8B SDIO_BUS_WIDE_8B
 #endif
 
+#if DT_INST_PROP(0, bus_width) == 1
+#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_1B
+#elif DT_INST_PROP(0, bus_width) == 4
+#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_4B
+#elif DT_INST_PROP(0, bus_width) == 8
+#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_8B
+#endif /* DT_INST_PROP(0, bus_width) */
+
 typedef void (*irq_config_func_t)(const struct device *dev);
 
 #if STM32_SDMMC_USE_DMA
@@ -365,7 +373,15 @@ static int stm32_sdmmc_access_init(struct disk_info *disk)
 		LOG_ERR("failed to init stm32_sdmmc (ErrorCode 0x%X)", priv->hsd.ErrorCode);
 		return -EIO;
 	}
-
+	if (SDMMC_BUS_WIDTH != SDMMC_BUS_WIDE_1B) {
+		priv->hsd.Init.BusWide = SDMMC_BUS_WIDTH;
+		err = HAL_SD_ConfigWideBusOperation(&priv->hsd, priv->hsd.Init.BusWide);
+		if (err != HAL_OK) {
+			LOG_ERR("failed to configure wide bus operation(ErrorCode 0x%X)",
+				priv->hsd.ErrorCode);
+			return -EIO;
+		}
+	}
 #ifdef CONFIG_SDMMC_STM32_HWFC
 	stm32_sdmmc_fc_enable(priv);
 #endif
@@ -866,14 +882,6 @@ static void stm32_sdmmc_irq_config_func(const struct device *dev)
 	irq_enable(DT_INST_IRQN(0));
 }
 
-#if DT_INST_PROP(0, bus_width) == 1
-#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_1B
-#elif DT_INST_PROP(0, bus_width) == 4
-#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_4B
-#elif DT_INST_PROP(0, bus_width) == 8
-#define SDMMC_BUS_WIDTH SDMMC_BUS_WIDE_8B
-#endif /* DT_INST_PROP(0, bus_width) */
-
 static struct stm32_pclken pclken_sdmmc[] = STM32_DT_INST_CLOCKS(0);
 
 static struct stm32_sdmmc_priv stm32_sdmmc_priv_1 = {
@@ -887,7 +895,7 @@ static struct stm32_sdmmc_priv stm32_sdmmc_priv_1 = {
 						: SDMMC_CLOCK_BYPASS_DISABLE,
 #endif
 		.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE,
-		.Init.BusWide = SDMMC_BUS_WIDTH,
+		.Init.BusWide = SDMMC_BUS_WIDE_1B,
 		.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_DISABLE,
 		.Init.ClockDiv = DT_INST_PROP_OR(0, clk_div, 0),
 	},