serial: imx: remove unneeded imx_transmit_buffer() from imx_start_tx()

Use imx_start_tx() just to enable the TX interrupt. It's the job of the
TX interrupt ISR to fill the transmit buffer, then. If the transmit buffer
is empty, the TX interrupt should be executed as soon as the start_tx()
enables the interrupt, so there is no reason for the extra
imx_transmit_buffer() call, here. Remove it.

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index c851247a27cbc7373c8e4644acdf5a284cdcf3f8..146663c100fd98a1313cd89c9ee1cce59bf3acbb 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -621,9 +621,6 @@ static void imx_start_tx(struct uart_port *port)
                        imx_dma_tx(sport);
                return;
        }
-
-       if (readl(sport->port.membase + uts_reg(sport)) & UTS_TXEMPTY)
-               imx_transmit_buffer(sport);
 }
 
 static irqreturn_t imx_rtsint(int irq, void *dev_id)