1 files changed, 10 insertions, 9 deletions

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index d57bf3e708d8..e99a28387505 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -96,6 +96,7 @@
 
  /* PDC registers */
 #define UART_PUT_PTCR(port,v)   __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
+#define UART_GET_TCR(port)      __raw_readl((port)->membase + ATMEL_PDC_TCR)
 #define UART_GET_PTSR(port)     __raw_readl((port)->membase + ATMEL_PDC_PTSR)
 
 #define UART_PUT_RPR(port,v)    __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
@@ -562,17 +563,22 @@ static void atmel_tx_dma(struct uart_port *port)
         struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
         int count;
 
+        /* nothing left to transmit? */
+        if (UART_GET_TCR(port))
+                return;
+
         xmit->tail += pdc->ofs;
         xmit->tail &= UART_XMIT_SIZE - 1;
 
         port->icount.tx += pdc->ofs;
         pdc->ofs = 0;
 
-        if (!uart_circ_empty(xmit)) {
-                /* more to transmit - setup next transfer */
+        /* more to transmit - setup next transfer */
 
-                /* disable PDC transmit */
-                UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+        /* disable PDC transmit */
+        UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
+
+        if (!uart_circ_empty(xmit)) {
                 dma_sync_single_for_device(port->dev,
                                            pdc->dma_addr,
                                            pdc->dma_size,
@@ -586,11 +592,6 @@ static void atmel_tx_dma(struct uart_port *port)
                 /* re-enable PDC transmit and interrupts */
                 UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
                 UART_PUT_IER(port, ATMEL_US_ENDTX | ATMEL_US_TXBUFE);
-        } else {
-                /* nothing left to transmit - disable the transmitter */
-
-                /* disable PDC transmit */
-                UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
         }
 
         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)