diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 4070d4e..62dc152 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -332,6 +332,8 @@ static int dwmci_init(struct mmc *mmc)
 	dwmci_writel(host, DWMCI_BMOD, 1);
 
 	fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
+	fifo_size = ((fifo_size & RX_WMARK(0xFFF)) >> 16) + 1;
+
 	if (host->fifoth_val)
 		fifoth_val = host->fifoth_val;
 	else