target/linux/layerscape/patches-5.4/819-uart-0006-tty-serial-fsl_lpuart-enable-loopback-mode.patch

   1 From 4dc6f2b9d454099445b8bc3a4a6328761335ce4d Mon Sep 17 00:00:00 2001
   2 From: Fugang Duan <fugang.duan@nxp.com>
   3 Date: Wed, 11 Sep 2019 16:23:25 +0800
   4 Subject: [PATCH] tty: serial: fsl_lpuart: enable loopback mode
   5
   6 Enable lpuart32 loopback mode.
   7
   8 Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
   9 ---
  10  drivers/tty/serial/fsl_lpuart.c | 8 ++++++++
  11  1 file changed, 8 insertions(+)
  12
  13 --- a/drivers/tty/serial/fsl_lpuart.c
  14 +++ b/drivers/tty/serial/fsl_lpuart.c
  15 @@ -1462,6 +1462,14 @@ static void lpuart32_set_mctrl(struct ua
  16                 temp |= UARTMODIR_TXCTSE;
  17
  18         lpuart32_write(port, temp, UARTMODIR);
  19 +
  20 +       temp = lpuart32_read(port, UARTCTRL);
  21 +       if (mctrl & TIOCM_LOOP)
  22 +               temp |= UARTCTRL_LOOPS;
  23 +       else
  24 +               temp &= ~UARTCTRL_LOOPS;
  25 +
  26 +       lpuart32_write(port, temp, UARTCTRL);
  27  }
  28
  29  static void lpuart_break_ctl(struct uart_port *port, int break_state)