target/linux/mediatek/patches-5.10/410-bt-mtk-serial-fix.patch

   1 --- a/drivers/tty/serial/8250/8250.h
   2 +++ b/drivers/tty/serial/8250/8250.h
   3 @@ -82,6 +82,7 @@ struct serial8250_config {
   4  #define UART_CAP_MINI  (1 << 17)       /* Mini UART on BCM283X family lacks:
   5                                          * STOP PARITY EPAR SPAR WLEN5 WLEN6
   6                                          */
   7 +#define UART_CAP_NMOD  (1 << 18)       /* UART doesn't do termios */
   8
   9  #define UART_BUG_QUOT  (1 << 0)        /* UART has buggy quot LSB */
  10  #define UART_BUG_TXEN  (1 << 1)        /* UART has buggy TX IIR status */
  11 --- a/drivers/tty/serial/8250/8250_port.c
  12 +++ b/drivers/tty/serial/8250/8250_port.c
  13 @@ -288,7 +288,7 @@ static const struct serial8250_config ua
  14                 .tx_loadsz      = 16,
  15                 .fcr            = UART_FCR_ENABLE_FIFO |
  16                                   UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
  17 -               .flags          = UART_CAP_FIFO,
  18 +               .flags          = UART_CAP_FIFO | UART_CAP_NMOD,
  19         },
  20         [PORT_NPCM] = {
  21                 .name           = "Nuvoton 16550",
  22 @@ -2719,6 +2719,11 @@ serial8250_do_set_termios(struct uart_po
  23         unsigned long flags;
  24         unsigned int baud, quot, frac = 0;
  25
  26 +       if (up->capabilities & UART_CAP_NMOD) {
  27 +               termios->c_cflag = 0;
  28 +               return;
  29 +       }
  30 +
  31         if (up->capabilities & UART_CAP_MINI) {
  32                 termios->c_cflag &= ~(CSTOPB | PARENB | PARODD | CMSPAR);
  33                 if ((termios->c_cflag & CSIZE) == CS5 ||