1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index 61fb8b6d19af..d5efd6c77904 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -1258,6 +1258,8 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
                 atmel_port->clk = clk_get(&pdev->dev, "usart");
                 clk_enable(atmel_port->clk);
                 port->uartclk = clk_get_rate(atmel_port->clk);
+                clk_disable(atmel_port->clk);
+                /* only enable clock when USART is in use */
         }
 
         atmel_port->use_dma_rx = data->use_dma_rx;
@@ -1379,6 +1381,8 @@ static int __init atmel_console_setup(struct console *co, char *options)
                 return -ENODEV;
         }
 
+        clk_enable(atmel_ports[co->index].clk);
+
         UART_PUT_IDR(port, -1);
         UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
         UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
@@ -1403,7 +1407,7 @@ static struct console atmel_console = {
         .data           = &atmel_uart,
 };
 
-#define ATMEL_CONSOLE_DEVICE    &atmel_console
+#define ATMEL_CONSOLE_DEVICE    (&atmel_console)
 
 /*
  * Early console initialization (before VM subsystem initialized).
@@ -1534,6 +1538,15 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
         if (ret)
                 goto err_add_port;
 
+        if (atmel_is_console_port(&port->uart)
+                        && ATMEL_CONSOLE_DEVICE->flags & CON_ENABLED) {
+                /*
+                 * The serial core enabled the clock for us, so undo
+                 * the clk_enable() in atmel_console_setup()
+                 */
+                clk_disable(port->clk);
+        }
+
         device_init_wakeup(&pdev->dev, 1);
         platform_set_drvdata(pdev, port);
 
@@ -1544,7 +1557,6 @@ err_add_port:
         port->rx_ring.buf = NULL;
 err_alloc_ring:
         if (!atmel_is_console_port(&port->uart)) {
-                clk_disable(port->clk);
                 clk_put(port->clk);
                 port->clk = NULL;
         }
@@ -1568,7 +1580,6 @@ static int __devexit atmel_serial_remove(struct platform_device *pdev)
 
         /* "port" is allocated statically, so we shouldn't free it */
 
-        clk_disable(atmel_port->clk);
         clk_put(atmel_port->clk);
 
         return ret;