diff --git a/drivers/mmc/renesas-sdhi.c b/drivers/mmc/renesas-sdhi.c
index 24130e620b..2acb8c6efa 100644
--- a/drivers/mmc/renesas-sdhi.c
+++ b/drivers/mmc/renesas-sdhi.c
@@ -862,6 +862,9 @@ static void renesas_sdhi_filter_caps(struct udevice *dev)
 	if (!(priv->caps & TMIO_SD_CAP_RCAR_GEN3))
 		return;
 
+	if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL)
+		priv->idma_bus_width = TMIO_SD_DMA_MODE_BUS_WIDTH;
+
 #if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || \
     CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
     CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
index 2c528689bd..6c0c840bbb 100644
--- a/drivers/mmc/tmio-common.c
+++ b/drivers/mmc/tmio-common.c
@@ -324,6 +324,8 @@ static int tmio_sd_dma_xfer(struct udevice *dev, struct mmc_data *data)
 
 	tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);
 
+	tmp |= priv->idma_bus_width;
+
 	if (data->flags & MMC_DATA_READ) {
 		buf = data->dest;
 		dir = DMA_FROM_DEVICE;
@@ -702,6 +704,7 @@ static void tmio_sd_host_init(struct tmio_sd_priv *priv)
 	if (priv->caps & TMIO_SD_CAP_DMA_INTERNAL) {
 		tmp = tmio_sd_readl(priv, TMIO_SD_DMA_MODE);
 		tmp |= TMIO_SD_DMA_MODE_ADDR_INC;
+		tmp |= priv->idma_bus_width;
 		tmio_sd_writel(priv, tmp, TMIO_SD_DMA_MODE);
 	}
 }
diff --git a/drivers/mmc/tmio-common.h b/drivers/mmc/tmio-common.h
index 9062300c64..59d5a0e22e 100644
--- a/drivers/mmc/tmio-common.h
+++ b/drivers/mmc/tmio-common.h
@@ -90,6 +90,7 @@
 #define   TMIO_SD_VOLT_180		(2 << 0)/* 1.8V signal */
 #define TMIO_SD_DMA_MODE		0x410
 #define   TMIO_SD_DMA_MODE_DIR_RD	BIT(16)	/* 1: from device, 0: to dev */
+#define   TMIO_SD_DMA_MODE_BUS_WIDTH	(BIT(5) | BIT(4)) /* RCar, 64bit */
 #define   TMIO_SD_DMA_MODE_ADDR_INC	BIT(0)	/* 1: address inc, 0: fixed */
 #define TMIO_SD_DMA_CTL		0x414
 #define   TMIO_SD_DMA_CTL_START	BIT(0)	/* start DMA (auto cleared) */
@@ -121,6 +122,7 @@ struct tmio_sd_priv {
 	unsigned int			version;
 	u32				caps;
 	u32				read_poll_flag;
+	u32				idma_bus_width;
 #define TMIO_SD_CAP_NONREMOVABLE	BIT(0)	/* Nonremovable e.g. eMMC */
 #define TMIO_SD_CAP_DMA_INTERNAL	BIT(1)	/* have internal DMA engine */
 #define TMIO_SD_CAP_DIV1024		BIT(2)	/* divisor 1024 is available */