diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index cbe6684..d9cf59e 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -54,6 +54,8 @@
 #define	AT91_TWI_THRCLR		BIT(24) /* Transmit Holding Register Clear */
 #define	AT91_TWI_RHRCLR		BIT(25) /* Receive Holding Register Clear */
 #define	AT91_TWI_LOCKCLR	BIT(26) /* Lock Clear */
+#define	AT91_TWI_FIFOEN		BIT(28) /* FIFO Enable */
+#define	AT91_TWI_FIFODIS	BIT(29) /* FIFO Disable */
 
 #define	AT91_TWI_MMR		0x0004	/* Master Mode Register */
 #define	AT91_TWI_IADRSZ_1	0x0100	/* Internal Device Address Size */
@@ -85,6 +87,22 @@
 #define	AT91_TWI_ACR_DATAL(len)	((len) & 0xff)
 #define	AT91_TWI_ACR_DIR	BIT(8)
 
+#define	AT91_TWI_FMR		0x0050	/* FIFO Mode Register */
+#define	AT91_TWI_FMR_TXRDYM(mode)	(((mode) & 0x3) << 0)
+#define	AT91_TWI_FMR_TXRDYM_MASK	(0x3 << 0)
+#define	AT91_TWI_FMR_RXRDYM(mode)	(((mode) & 0x3) << 4)
+#define	AT91_TWI_FMR_RXRDYM_MASK	(0x3 << 4)
+#define	AT91_TWI_ONE_DATA	0x0
+#define	AT91_TWI_TWO_DATA	0x1
+#define	AT91_TWI_FOUR_DATA	0x2
+
+#define	AT91_TWI_FLR		0x0054	/* FIFO Level Register */
+
+#define	AT91_TWI_FSR		0x0060	/* FIFO Status Register */
+#define	AT91_TWI_FIER		0x0064	/* FIFO Interrupt Enable Register */
+#define	AT91_TWI_FIDR		0x0068	/* FIFO Interrupt Disable Register */
+#define	AT91_TWI_FIMR		0x006c	/* FIFO Interrupt Mask Register */
+
 #define	AT91_TWI_VER		0x00fc	/* Version Register */
 
 struct at91_twi_pdata {
@@ -98,7 +116,7 @@ struct at91_twi_pdata {
 struct at91_twi_dma {
 	struct dma_chan *chan_rx;
 	struct dma_chan *chan_tx;
-	struct scatterlist sg;
+	struct scatterlist sg[2];
 	struct dma_async_tx_descriptor *data_desc;
 	enum dma_data_direction direction;
 	bool buf_mapped;
@@ -121,6 +139,7 @@ struct at91_twi_dev {
 	struct at91_twi_pdata *pdata;
 	bool use_dma;
 	bool recv_len_abort;
+	u32 fifo_size;
 	struct at91_twi_dma dma;
 };
 
@@ -154,6 +173,9 @@ static void at91_init_twi_bus(struct at91_twi_dev *dev)
 {
 	at91_disable_twi_interrupts(dev);
 	at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SWRST);
+	/* FIFO should be enabled immediately after the software reset */
+	if (dev->fifo_size)
+		at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_FIFOEN);
 	at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_MSEN);
 	at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_SVDIS);
 	at91_twi_write(dev, AT91_TWI_CWGR, dev->twi_cwgr_reg);
@@ -200,7 +222,7 @@ static void at91_twi_dma_cleanup(struct at91_twi_dev *dev)
 		dma->xfer_in_progress = false;
 	}
 	if (dma->buf_mapped) {
-		dma_unmap_single(dev->dev, sg_dma_address(&dma->sg),
+		dma_unmap_single(dev->dev, sg_dma_address(&dma->sg[0]),
 				 dev->buf_len, dma->direction);
 		dma->buf_mapped = false;
 	}
@@ -213,7 +235,8 @@ static void at91_twi_write_next_byte(struct at91_twi_dev *dev)
 	if (dev->buf_len <= 0)
 		return;
 
-	at91_twi_write(dev, AT91_TWI_THR, *dev->buf);
+	/* 8bit write works with and without FIFO */
+	writeb_relaxed(*dev->buf, dev->base + AT91_TWI_THR);
 
 	/* send stop when last byte has been written */
 	if (--dev->buf_len == 0)
@@ -229,7 +252,7 @@ static void at91_twi_write_data_dma_callback(void *data)
 {
 	struct at91_twi_dev *dev = (struct at91_twi_dev *)data;
 
-	dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg),
+	dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg[0]),
 			 dev->buf_len, DMA_TO_DEVICE);
 
 	/*
@@ -250,6 +273,7 @@ static void at91_twi_write_data_dma(struct at91_twi_dev *dev)
 	struct dma_async_tx_descriptor *txdesc;
 	struct at91_twi_dma *dma = &dev->dma;
 	struct dma_chan *chan_tx = dma->chan_tx;
+	unsigned int sg_len = 1;
 
 	if (dev->buf_len <= 0)
 		return;
@@ -265,10 +289,43 @@ static void at91_twi_write_data_dma(struct at91_twi_dev *dev)
 	}
 	dma->buf_mapped = true;
 	at91_twi_irq_restore(dev);
-	sg_dma_len(&dma->sg) = dev->buf_len;
-	sg_dma_address(&dma->sg) = dma_addr;
 
-	txdesc = dmaengine_prep_slave_sg(chan_tx, &dma->sg, 1, DMA_MEM_TO_DEV,
+	if (dev->fifo_size) {
+		size_t part1_len, part2_len;
+		struct scatterlist *sg;
+		unsigned fifo_mr;
+
+		sg_len = 0;
+
+		part1_len = dev->buf_len & ~0x3;
+		if (part1_len) {
+			sg = &dma->sg[sg_len++];
+			sg_dma_len(sg) = part1_len;
+			sg_dma_address(sg) = dma_addr;
+		}
+
+		part2_len = dev->buf_len & 0x3;
+		if (part2_len) {
+			sg = &dma->sg[sg_len++];
+			sg_dma_len(sg) = part2_len;
+			sg_dma_address(sg) = dma_addr + part1_len;
+		}
+
+		/*
+		 * DMA controller is triggered when at least 4 data can be
+		 * written into the TX FIFO
+		 */
+		fifo_mr = at91_twi_read(dev, AT91_TWI_FMR);
+		fifo_mr &= ~AT91_TWI_FMR_TXRDYM_MASK;
+		fifo_mr |= AT91_TWI_FMR_TXRDYM(AT91_TWI_FOUR_DATA);
+		at91_twi_write(dev, AT91_TWI_FMR, fifo_mr);
+	} else {
+		sg_dma_len(&dma->sg[0]) = dev->buf_len;
+		sg_dma_address(&dma->sg[0]) = dma_addr;
+	}
+
+	txdesc = dmaengine_prep_slave_sg(chan_tx, dma->sg, sg_len,
+					 DMA_MEM_TO_DEV,
 					 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!txdesc) {
 		dev_err(dev->dev, "dma prep slave sg failed\n");
@@ -293,7 +350,8 @@ static void at91_twi_read_next_byte(struct at91_twi_dev *dev)
 	if (dev->buf_len <= 0)
 		return;
 
-	*dev->buf = at91_twi_read(dev, AT91_TWI_RHR) & 0xff;
+	/* 8bit read works with and without FIFO */
+	*dev->buf = readb_relaxed(dev->base + AT91_TWI_RHR);
 	--dev->buf_len;
 
 	/* return if aborting, we only needed to read RHR to clear RXRDY*/
@@ -330,7 +388,7 @@ static void at91_twi_read_data_dma_callback(void *data)
 	struct at91_twi_dev *dev = (struct at91_twi_dev *)data;
 	unsigned ier = AT91_TWI_TXCOMP;
 
-	dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg),
+	dma_unmap_single(dev->dev, sg_dma_address(&dev->dma.sg[0]),
 			 dev->buf_len, DMA_FROM_DEVICE);
 
 	if (!dev->pdata->has_alt_cmd) {
@@ -362,10 +420,24 @@ static void at91_twi_read_data_dma(struct at91_twi_dev *dev)
 	}
 	dma->buf_mapped = true;
 	at91_twi_irq_restore(dev);
-	dma->sg.dma_address = dma_addr;
-	sg_dma_len(&dma->sg) = buf_len;
 
-	rxdesc = dmaengine_prep_slave_sg(chan_rx, &dma->sg, 1, DMA_DEV_TO_MEM,
+	if (dev->fifo_size && IS_ALIGNED(buf_len, 4)) {
+		unsigned fifo_mr;
+
+		/*
+		 * DMA controller is triggered when at least 4 data can be
+		 * read from the RX FIFO
+		 */
+		fifo_mr = at91_twi_read(dev, AT91_TWI_FMR);
+		fifo_mr &= ~AT91_TWI_FMR_RXRDYM_MASK;
+		fifo_mr |= AT91_TWI_FMR_RXRDYM(AT91_TWI_FOUR_DATA);
+		at91_twi_write(dev, AT91_TWI_FMR, fifo_mr);
+	}
+
+	sg_dma_len(&dma->sg[0]) = buf_len;
+	sg_dma_address(&dma->sg[0]) = dma_addr;
+
+	rxdesc = dmaengine_prep_slave_sg(chan_rx, dma->sg, 1, DMA_DEV_TO_MEM,
 					 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 	if (!rxdesc) {
 		dev_err(dev->dev, "dma prep slave sg failed\n");
@@ -465,6 +537,21 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev)
 	reinit_completion(&dev->cmd_complete);
 	dev->transfer_status = 0;
 
+	if (dev->fifo_size) {
+		unsigned fifo_mr = at91_twi_read(dev, AT91_TWI_FMR);
+
+		/* Reset FIFO mode register */
+		fifo_mr &= ~(AT91_TWI_FMR_TXRDYM_MASK |
+			     AT91_TWI_FMR_RXRDYM_MASK);
+		fifo_mr |= AT91_TWI_FMR_TXRDYM(AT91_TWI_ONE_DATA);
+		fifo_mr |= AT91_TWI_FMR_RXRDYM(AT91_TWI_ONE_DATA);
+		at91_twi_write(dev, AT91_TWI_FMR, fifo_mr);
+
+		/* Flush FIFOs */
+		at91_twi_write(dev, AT91_TWI_CR,
+			       AT91_TWI_THRCLR | AT91_TWI_RHRCLR);
+	}
+
 	if (!dev->buf_len) {
 		at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_QUICK);
 		at91_twi_write(dev, AT91_TWI_IER, AT91_TWI_TXCOMP);
@@ -536,7 +623,8 @@ static int at91_do_twi_transfer(struct at91_twi_dev *dev)
 		ret = -EIO;
 		goto error;
 	}
-	if (has_alt_cmd && (dev->transfer_status & AT91_TWI_LOCK)) {
+	if ((has_alt_cmd || dev->fifo_size) &&
+	    (dev->transfer_status & AT91_TWI_LOCK)) {
 		dev_err(dev->dev, "tx locked\n");
 		ret = -EIO;
 		goto error;
@@ -555,7 +643,8 @@ error:
 	/* first stop DMA transfer if still in progress */
 	at91_twi_dma_cleanup(dev);
 	/* then flush THR/FIFO and unlock TX if locked */
-	if (has_alt_cmd && (dev->transfer_status & AT91_TWI_LOCK)) {
+	if ((has_alt_cmd || dev->fifo_size) &&
+	    (dev->transfer_status & AT91_TWI_LOCK)) {
 		dev_dbg(dev->dev, "unlock tx\n");
 		at91_twi_write(dev, AT91_TWI_CR,
 			       AT91_TWI_THRCLR | AT91_TWI_LOCKCLR);
@@ -750,13 +839,32 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
 	int ret = 0;
 	struct dma_slave_config slave_config;
 	struct at91_twi_dma *dma = &dev->dma;
+	enum dma_slave_buswidth addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+
+	/*
+	 * The actual width of the access will be chosen in
+	 * dmaengine_prep_slave_sg():
+	 * for each buffer in the scatter-gather list, if its size is aligned
+	 * to addr_width then addr_width accesses will be performed to transfer
+	 * the buffer. On the other hand, if the buffer size is not aligned to
+	 * addr_width then the buffer is transferred using single byte accesses.
+	 * Please refer to the Atmel eXtended DMA controller driver.
+	 * When FIFOs are used, the TXRDYM threshold can always be set to
+	 * trigger the XDMAC when at least 4 data can be written into the TX
+	 * FIFO, even if single byte accesses are performed.
+	 * However the RXRDYM threshold must be set to fit the access width,
+	 * deduced from buffer length, so the XDMAC is triggered properly to
+	 * read data from the RX FIFO.
+	 */
+	if (dev->fifo_size)
+		addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 
 	memset(&slave_config, 0, sizeof(slave_config));
 	slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
-	slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+	slave_config.src_addr_width = addr_width;
 	slave_config.src_maxburst = 1;
 	slave_config.dst_addr = (dma_addr_t)phy_addr + AT91_TWI_THR;
-	slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+	slave_config.dst_addr_width = addr_width;
 	slave_config.dst_maxburst = 1;
 	slave_config.device_fc = false;
 
@@ -788,7 +896,7 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
 		goto error;
 	}
 
-	sg_init_table(&dma->sg, 1);
+	sg_init_table(dma->sg, 2);
 	dma->buf_mapped = false;
 	dma->xfer_in_progress = false;
 	dev->use_dma = true;
@@ -875,6 +983,10 @@ static int at91_twi_probe(struct platform_device *pdev)
 	}
 
 	dev_info(dev->dev, "version: %#x\n", at91_twi_read(dev, AT91_TWI_VER));
+	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
+				  &dev->fifo_size)) {
+		dev_info(dev->dev, "Using FIFO (%u data)\n", dev->fifo_size);
+	}
 
 	rc = of_property_read_u32(dev->dev->of_node, "clock-frequency",
 			&bus_clk_rate);
