target/linux/layerscape/patches-5.4/819-uart-0003-tty-serial-fsl_lpuart-add-magic-SysRq-support.patch

   1 From 74d7e639cce7ae95cacd948dcf5ed3b28c3fff5c Mon Sep 17 00:00:00 2001
   2 From: Fugang Duan <fugang.duan@nxp.com>
   3 Date: Mon, 28 Jan 2019 10:27:27 +0800
   4 Subject: [PATCH] tty: serial: fsl_lpuart: add magic SysRq support
   5
   6 Add magic SysRq key support.
   7
   8 Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
   9 ---
  10  drivers/tty/serial/fsl_lpuart.c | 7 ++++++-
  11  1 file changed, 6 insertions(+), 1 deletion(-)
  12
  13 --- a/drivers/tty/serial/fsl_lpuart.c
  14 +++ b/drivers/tty/serial/fsl_lpuart.c
  15 @@ -918,7 +918,12 @@ static void lpuart32_rxint(struct lpuart
  16                  */
  17                 sr = lpuart32_read(&sport->port, UARTSTAT);
  18                 rx = lpuart32_read(&sport->port, UARTDATA);
  19 -               rx &= 0x3ff;
  20 +
  21 +               if ((sr & UARTSTAT_FE) && (rx & UARTDATA_FRETSC) &&
  22 +                       !(rx & UARTDATA_MASK)) {
  23 +                       if (uart_handle_break(&sport->port))
  24 +                               continue;
  25 +               }
  26
  27                 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
  28                         continue;