diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 2624844..8f5c0fc 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -164,13 +164,13 @@
 	if (!priv->fifo_len) {
 		u32 fifo;
 
-		for (fifo = 2; fifo <= 256; fifo++) {
+		for (fifo = 1; fifo < 256; fifo++) {
 			dw_writew(priv, DW_SPI_TXFLTR, fifo);
 			if (fifo != dw_readw(priv, DW_SPI_TXFLTR))
 				break;
 		}
 
-		priv->fifo_len = (fifo == 2) ? 0 : fifo - 1;
+		priv->fifo_len = (fifo == 1) ? 0 : fifo;
 		dw_writew(priv, DW_SPI_TXFLTR, 0);
 	}
 	debug("%s: fifo_len=%d\n", __func__, priv->fifo_len);