serial: imx: do not stop Rx/Tx on termios change

imx_set_termios(): stopping receiver and transmitter does harm when
something that doesn't touch transmission format/rate changes, such as
RTS/CTS handshake.

OTOH, it does no good on baud rate or format change, as
synchronization on upper-level protocols is still required to do it
right.

Therefore, just stop doing it.

Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/1567017475-11919-3-git-send-email-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 3 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 47b6156f5b2c..fa723a9a9c8c 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1652,9 +1652,6 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
                         UCR1);
         imx_uart_writel(sport, old_ucr2 & ~UCR2_ATEN, UCR2);
 
-        /* then, disable everything */
-        imx_uart_writel(sport, old_ucr2 & ~(UCR2_TXEN | UCR2_RXEN | UCR2_ATEN), UCR2);
-
         /* custom-baudrate handling */
         div = sport->port.uartclk / (baud * 16);
         if (baud == 38400 && quot != div)