diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 3f610d55f38e76513bd6e26bc236645b0d1f5a4e..3832312ce7cb8d1c05573aa324657d7f19fc0e5e 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1116,8 +1116,8 @@ static void dw_mci_write_data_pio(struct dw_mci *host)
 	unsigned int nbytes = 0, len;
 
 	do {
-		len = SDMMC_FIFO_SZ -
-			(SDMMC_GET_FCNT(mci_readl(host, STATUS)) << shift);
+		len = (host->fifo_depth -
+			SDMMC_GET_FCNT(mci_readl(host, STATUS))) << shift;
 		if (offset + len <= sg->length) {
 			host->push_data(host, (void *)(buf + offset), len);
 
@@ -1659,8 +1659,19 @@ static int dw_mci_probe(struct platform_device *pdev)
 	 * FIFO threshold settings  RxMark  = fifo_size / 2 - 1,
 	 *                          Tx Mark = fifo_size / 2 DMA Size = 8
 	 */
-	fifo_size = mci_readl(host, FIFOTH);
-	fifo_size = (fifo_size >> 16) & 0x7ff;
+	if (!host->pdata->fifo_depth) {
+		/*
+		 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may
+		 * have been overwritten by the bootloader, just like we're
+		 * about to do, so if you know the value for your hardware, you
+		 * should put it in the platform data.
+		 */
+		fifo_size = mci_readl(host, FIFOTH);
+		fifo_size = 1 + ((fifo_size >> 16) & 0x7ff);
+	} else {
+		fifo_size = host->pdata->fifo_depth;
+	}
+	host->fifo_depth = fifo_size;
 	host->fifoth_val = ((0x2 << 28) | ((fifo_size/2 - 1) << 16) |
 			((fifo_size/2) << 0));
 	mci_writel(host, FIFOTH, host->fifoth_val);
@@ -1707,7 +1718,9 @@ static int dw_mci_probe(struct platform_device *pdev)
 	mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); /* Enable mci interrupt */
 
 	dev_info(&pdev->dev, "DW MMC controller at irq %d, "
-		 "%d bit host data width\n", irq, width);
+		 "%d bit host data width, "
+		 "%u deep fifo\n",
+		 irq, width, fifo_size);
 	if (host->quirks & DW_MCI_QUIRK_IDMAC_DTO)
 		dev_info(&pdev->dev, "Internal DMAC interrupt fix enabled.\n");
 
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index bb9e5de76ae9ce033c383350e047b6785801266f..027d3773539429eea6ca081ab8dccfd2fbba8bcd 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -118,7 +118,6 @@
 #define SDMMC_CMD_INDX(n)		((n) & 0x1F)
 /* Status register defines */
 #define SDMMC_GET_FCNT(x)		(((x)>>17) & 0x1FF)
-#define SDMMC_FIFO_SZ			32
 /* Internal DMAC interrupt defines */
 #define SDMMC_IDMAC_INT_AI		BIT(9)
 #define SDMMC_IDMAC_INT_NI		BIT(8)
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index dea48475c436e7db7184ce2a9239e3e3ae5b17dd..01db1a0b3dd18694a54effe8a1ce7df66b95990b 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -74,6 +74,7 @@ struct mmc_data;
  * @pdev: Platform device associated with the MMC controller.
  * @pdata: Platform data associated with the MMC controller.
  * @slot: Slots sharing this MMC controller.
+ * @fifo_depth: depth of FIFO.
  * @data_shift: log2 of FIFO item size.
  * @push_data: Pointer to FIFO push function.
  * @pull_data: Pointer to FIFO pull function.
@@ -146,6 +147,7 @@ struct dw_mci {
 	struct dw_mci_slot	*slot[MAX_MCI_SLOTS];
 
 	/* FIFO push and pull */
+	int			fifo_depth;
 	int			data_shift;
 	void (*push_data)(struct dw_mci *host, void *buf, int cnt);
 	void (*pull_data)(struct dw_mci *host, void *buf, int cnt);
@@ -196,6 +198,12 @@ struct dw_mci_board {
 	unsigned int bus_hz; /* Bus speed */
 
 	unsigned int caps;	/* Capabilities */
+	/*
+	 * Override fifo depth. If 0, autodetect it from the FIFOTH register,
+	 * but note that this may not be reliable after a bootloader has used
+	 * it.
+	 */
+	unsigned int fifo_depth;
 
 	/* delay in mS before detecting cards after interrupt */
 	u32 detect_delay_ms;