1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 11c0117af80b..fabbe76203bb 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -481,6 +481,14 @@ static void atmel_stop_tx(struct uart_port *port)
                 /* disable PDC transmit */
                 atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS);
         }
+
+        /*
+         * Disable the transmitter.
+         * This is mandatory when DMA is used, otherwise the DMA buffer
+         * is fully transmitted.
+         */
+        atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS);
+
         /* Disable interrupts */
         atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
 
@@ -513,6 +521,9 @@ static void atmel_start_tx(struct uart_port *port)
 
         /* Enable interrupts */
         atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask);
+
+        /* re-enable the transmitter */
+        atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN);
 }
 
 /*