From 21c4e7f255e38620bb4c5d1119c64114ab280e2e Mon Sep 17 00:00:00 2001 From: Ricardo Ribalda Delgado Date: Mon, 6 Nov 2017 11:49:13 +0100 Subject: [PATCH] serial: 8250_fintek: Disable delays for ports != 0 According to the datasheet, only the first port supports delay before send and delay after send. Reported-by: "Ji-Ze Hong (Peter Hong)" Signed-off-by: Ricardo Ribalda Delgado Signed-off-by: Greg Kroah-Hartman --- 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 6c7910d..ae7d86e 100644 --- a/drivers/tty/serial/8250/8250_fintek.c +++ b/drivers/tty/serial/8250/8250_fintek.c @@ -212,6 +212,12 @@ 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; -- 2.7.4