According to the datasheet, only the first port supports delay before send and delay after send.
Reported-by: "Ji-Ze Hong (Peter Hong)" <[email protected]> Signed-off-by: Ricardo Ribalda Delgado <[email protected]> --- drivers/tty/serial/8250/8250_fintek.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c index ca7e96f9f080..61745d4bea31 100644 --- a/drivers/tty/serial/8250/8250_fintek.c +++ b/drivers/tty/serial/8250/8250_fintek.c @@ -216,6 +216,12 @@ static int fintek_8250_rs485_config(struct uart_port *port, rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND; + /* Only the first port supports delays */ + if (pdata->index) { + rs485->delay_rts_before_send = 0; + rs485->delay_rts_after_send = 0; + } + if (rs485->delay_rts_before_send) { rs485->delay_rts_before_send = 1; config |= TXW4C_IRA; -- 2.14.2
