diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index a5f03dd..f512939 100644
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -38,8 +38,6 @@
 
 #define CS_DEFAULT	0xFF
 
-#define SPI_BUFSIZ	(SMP_CACHE_BYTES + 1)
-
 #define SPIFMT_PHASE_MASK	BIT(16)
 #define SPIFMT_POLARITY_MASK	BIT(17)
 #define SPIFMT_DISTIMER_MASK	BIT(18)
@@ -140,7 +138,6 @@ struct davinci_spi {
 
 	const void		*tx;
 	void			*rx;
-	u8			*tmp_buf;
 	int			rcount;
 	int			wcount;
 	struct davinci_spi_dma	dma_channels;
@@ -718,7 +715,7 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct davinci_spi *davinci_spi;
 	int int_status = 0;
-	int count, temp_count;
+	int count;
 	struct davinci_spi_dma *davinci_spi_dma;
 	int data_type, ret;
 	unsigned long tx_reg, rx_reg;
@@ -750,6 +747,18 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
 	/* Enable SPI */
 	set_io_bits(davinci_spi->base + SPIGCR1, SPIGCR1_SPIENA_MASK);
 
+	/*
+	 * Transmit DMA setup
+	 *
+	 * If there is transmit data, map the transmit buffer, set it as the
+	 * source of data and set the source B index to data size.
+	 * If there is no transmit data, set the transmit register as the
+	 * source of data, and set the source B index to zero.
+	 *
+	 * The destination is always the transmit register itself. And the
+	 * destination never increments.
+	 */
+
 	if (t->tx_buf) {
 		t->tx_dma = dma_map_single(&spi->dev, (void *)t->tx_buf, count,
 				DMA_TO_DEVICE);
@@ -758,25 +767,15 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
 				" TX buffer\n", count);
 			return -ENOMEM;
 		}
-		temp_count = count;
-	} else {
-		/* We need TX clocking for RX transaction */
-		t->tx_dma = dma_map_single(&spi->dev,
-				(void *)davinci_spi->tmp_buf, count + 1,
-				DMA_TO_DEVICE);
-		if (dma_mapping_error(&spi->dev, t->tx_dma)) {
-			dev_dbg(sdev, "Unable to DMA map a %d bytes"
-				" TX tmp buffer\n", count);
-			return -ENOMEM;
-		}
-		temp_count = count + 1;
 	}
 
 	edma_set_transfer_params(davinci_spi_dma->dma_tx_channel,
-					data_type, temp_count, 1, 0, ASYNC);
+					data_type, count, 1, 0, ASYNC);
 	edma_set_dest(davinci_spi_dma->dma_tx_channel, tx_reg, INCR, W8BIT);
-	edma_set_src(davinci_spi_dma->dma_tx_channel, t->tx_dma, INCR, W8BIT);
-	edma_set_src_index(davinci_spi_dma->dma_tx_channel, data_type, 0);
+	edma_set_src(davinci_spi_dma->dma_tx_channel,
+			t->tx_buf ? t->tx_dma : tx_reg, INCR, W8BIT);
+	edma_set_src_index(davinci_spi_dma->dma_tx_channel,
+			t->tx_buf ? data_type : 0, 0);
 	edma_set_dest_index(davinci_spi_dma->dma_tx_channel, 0, 0);
 
 	if (t->rx_buf) {
@@ -818,7 +817,8 @@ static int davinci_spi_bufs_dma(struct spi_device *spi, struct spi_transfer *t)
 		wait_for_completion_interruptible(
 				&davinci_spi_dma->dma_rx_completion);
 
-	dma_unmap_single(NULL, t->tx_dma, temp_count, DMA_TO_DEVICE);
+	if (t->tx_buf)
+		dma_unmap_single(NULL, t->tx_dma, count, DMA_TO_DEVICE);
 
 	if (t->rx_buf)
 		dma_unmap_single(NULL, t->rx_dma, count, DMA_FROM_DEVICE);
@@ -906,17 +906,10 @@ static int davinci_spi_probe(struct platform_device *pdev)
 	if (ret)
 		goto unmap_io;
 
-	/* Allocate tmp_buf for tx_buf */
-	davinci_spi->tmp_buf = kzalloc(SPI_BUFSIZ, GFP_KERNEL);
-	if (davinci_spi->tmp_buf == NULL) {
-		ret = -ENOMEM;
-		goto irq_free;
-	}
-
 	davinci_spi->bitbang.master = spi_master_get(master);
 	if (davinci_spi->bitbang.master == NULL) {
 		ret = -ENODEV;
-		goto free_tmp_buf;
+		goto irq_free;
 	}
 
 	davinci_spi->clk = clk_get(&pdev->dev, NULL);
@@ -1027,8 +1020,6 @@ free_clk:
 	clk_put(davinci_spi->clk);
 put_master:
 	spi_master_put(master);
-free_tmp_buf:
-	kfree(davinci_spi->tmp_buf);
 irq_free:
 	free_irq(davinci_spi->irq, davinci_spi);
 unmap_io:
@@ -1063,7 +1054,6 @@ static int __exit davinci_spi_remove(struct platform_device *pdev)
 	clk_disable(davinci_spi->clk);
 	clk_put(davinci_spi->clk);
 	spi_master_put(master);
-	kfree(davinci_spi->tmp_buf);
 	free_irq(davinci_spi->irq, davinci_spi);
 	iounmap(davinci_spi->base);
 	release_mem_region(davinci_spi->pbase, davinci_spi->region_size);
