ENGR00322581-04 serial: imx: fix the software flow control

Controls the CTS pin when the CTSC bit is negated. CTS has no
function when CTSC is asserted. After The CTS pin is low, it
needs to enable CTSC.

The patch just fix the issue.

Signed-off-by: Fugang Duan  <B38611@freescale.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index c73c05b33c49..1570934978d7 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -839,11 +839,9 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
         struct imx_port *sport = (struct imx_port *)port;
         unsigned long temp;
 
-        temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
-
+        temp = readl(sport->port.membase + UCR2) & ~(UCR2_CTS | UCR2_CTSC);
         if (mctrl & TIOCM_RTS)
-                if (!sport->dma_is_enabled)
-                        temp |= UCR2_CTS;
+                temp |= UCR2_CTS | UCR2_CTSC;
 
         writel(temp, sport->port.membase + UCR2);