If using modem-control gpios for CTS we must leave IRTS disabled
as otherwise the hardware will only transmit based on the internal RTS
pin routed to it.
This allows hardware flow control to be used with cts-gpios.
Signed-off-by: Tim Harvey <tharvey@xxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index df8a0c8b8b29..bf2bb987a51f 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -201,6 +201,7 @@ struct imx_port {
unsigned int old_status;
unsigned int have_rtscts:1;
unsigned int have_rtsgpio:1;
+ unsigned int have_ctsgpio:1;
unsigned int dte_mode:1;
unsigned int inverted_tx:1;
unsigned int inverted_rx:1;
@@ -1674,8 +1675,7 @@ imx_uart_set_termios(struct uart_port *port, struct ktermios *termios,
if (ucr2 & UCR2_CTS)
ucr2 |= UCR2_CTSC;
}
-
- if (termios->c_cflag & CRTSCTS)
+ if (!sport->have_ctsgpio && termios->c_cflag & CRTSCTS)
ucr2 &= ~UCR2_IRTS;
if (termios->c_cflag & CSTOPB)
ucr2 |= UCR2_STPB;
@@ -2227,6 +2227,9 @@ static int imx_uart_probe(struct platform_device *pdev)
if (of_get_property(np, "fsl,dte-mode", NULL))
sport->dte_mode = 1;
+ if (of_get_property(np, "cts-gpios", NULL))
+ sport->have_ctsgpio = 1;
+
if (of_get_property(np, "rts-gpios", NULL))
sport->have_rtsgpio = 1;
--
2.17.1
