i2c: tegra: Always terminate DMA transfer

It is possible that I2C could error out in the middle of DMA transfer and
in this case DMA channel needs to be reset, otherwise a follow up transfer
will fail because DMA channel stays blocked.
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-tegra.c

@@ -1220,11 +1220,12 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 		time_left = tegra_i2c_wait_completion_timeout(
 				i2c_dev, &i2c_dev->dma_complete, xfer_time);
 
-		if (time_left == 0) {
-			dev_err(i2c_dev->dev, "DMA transfer timeout\n");
 		dmaengine_terminate_sync(i2c_dev->msg_read ?
 					 i2c_dev->rx_dma_chan :
 					 i2c_dev->tx_dma_chan);
+
+		if (time_left == 0) {
+			dev_err(i2c_dev->dev, "DMA transfer timeout\n");
 			tegra_i2c_init(i2c_dev, true);
 			return -ETIMEDOUT;
 		}
@@ -1237,11 +1238,6 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 			memcpy(i2c_dev->msg_buf, i2c_dev->dma_buf,
 			       msg->len);
 		}
-
-		if (i2c_dev->msg_err != I2C_ERR_NONE)
-			dmaengine_synchronize(i2c_dev->msg_read ?
-					      i2c_dev->rx_dma_chan :
-					      i2c_dev->tx_dma_chan);
 	}
 
 	time_left = tegra_i2c_wait_completion_timeout(