linux-kernel - [PATCH 2/2] serial: 8250_fintek: Disable delays for ports != 0

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Date:   Mon,  6 Nov 2017 11:49:13 +0100
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "Ji-Ze Hong (Peter Hong)" <hpeter@...il.com>,
        Lukas Wunner <lukas@...ner.de>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 2/2] 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)" <hpeter@...il.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
 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