* [PATCH] serial: uartps: Enable automatic flow control
@ 2018-09-03 13:05 Michal Simek
0 siblings, 0 replies; only message in thread
From: Michal Simek @ 2018-09-03 13:05 UTC (permalink / raw)
To: linux-kernel, monstr
Cc: Jiri Slaby, linux-serial, Greg Kroah-Hartman, linux-arm-kernel
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@xilinx.com>
Acked-by: Nava kishore Manne <navam@xilinx.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
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