linux-kernel - [PATCH] serial: uartps: Enable automatic flow control

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Message-Id: <2e3db53f40db4ce52000f39461c9b0e534e8ec2c.1535979935.git.michal.simek@xilinx.com>
Date:   Mon,  3 Sep 2018 15:05:37 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] serial: uartps: Enable automatic flow control

Enable automatic flow control which should ensure that there is no
mainteinance in connection for zcu100 BT case.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
Acked-by: Nava kishore Manne <navam@...inx.com>
---

 drivers/tty/serial/xilinx_uartps.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index a48f19b1b88f..e5d90611c03f 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1003,13 +1003,12 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	val = readl(port->membase + CDNS_UART_MODEMCR);
 	mode_reg = readl(port->membase + CDNS_UART_MR);
 
-	val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR);
+	val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR |
+		 CDNS_UART_MODEMCR_FCM);
 	mode_reg &= ~CDNS_UART_MR_CHMODE_MASK;
 
-	if (mctrl & TIOCM_RTS)
-		val |= CDNS_UART_MODEMCR_RTS;
-	if (mctrl & TIOCM_DTR)
-		val |= CDNS_UART_MODEMCR_DTR;
+	if (mctrl & TIOCM_RTS || mctrl & TIOCM_DTR)
+		val |= CDNS_UART_MODEMCR_FCM;
 	if (mctrl & TIOCM_LOOP)
 		mode_reg |= CDNS_UART_MR_CHMODE_L_LOOP;
 	else
-- 
1.9.1