target/linux/mediatek/patches-4.19/0900-bt-mtk-serial-fix.patch

   1 diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
   2 index ebfb0bd..2b9ba39 100644
   3 --- a/drivers/tty/serial/8250/8250.h
   4 +++ b/drivers/tty/serial/8250/8250.h
   5 @@ -80,6 +80,7 @@  struct serial8250_config {
   6  #define UART_CAP_MINI  (1 << 17)       /* Mini UART on BCM283X family lacks:
   7                                          * STOP PARITY EPAR SPAR WLEN5 WLEN6
   8                                          */
   9 +#define UART_CAP_NMOD  (1 << 18)       /* UART doesn't do termios */
  10
  11  #define UART_BUG_QUOT  (1 << 0)        /* UART has buggy quot LSB */
  12  #define UART_BUG_TXEN  (1 << 1)        /* UART has buggy TX IIR status */
  13 diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
  14 index c39482b..e4a69a0 100644
  15 --- a/drivers/tty/serial/8250/8250_port.c
  16 +++ b/drivers/tty/serial/8250/8250_port.c
  17 @@ -297,7 +297,7 @@
  18                 .tx_loadsz      = 16,
  19                 .fcr            = UART_FCR_ENABLE_FIFO |
  20                                   UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
  21 -               .flags          = UART_CAP_FIFO,
  22 +               .flags          = UART_CAP_FIFO | UART_CAP_NMOD,
  23         },
  24         [PORT_NPCM] = {
  25                 .name           = "Nuvoton 16550",
  26 @@ -2663,6 +2663,11 @@  static unsigned int serial8250_get_baud_rate(struct uart_port *port,
  27         unsigned long flags;
  28         unsigned int baud, quot, frac = 0;
  29
  30 +       if (up->capabilities & UART_CAP_NMOD) {
  31 +               termios->c_cflag = 0;
  32 +               return;
  33 +       }
  34 +
  35         if (up->capabilities & UART_CAP_MINI) {
  36                 termios->c_cflag &= ~(CSTOPB | PARENB | PARODD | CMSPAR);
  37                 if ((termios->c_cflag & CSIZE) == CS5 ||