[PATCH 8/8] serial: core: Mask mctrl with TIOCM_RTS too if rs485 on and RTS_AFTER_SEND set.

[Giulio Benetti]

If rs485 is enabled and RTS_AFTER_SEND is set on startup need to keep
TIOCM_RTS asserted to keep rs485 transceiver in RX when idle.

Check if rs485 is on and RTS_AFTER_SEND is set and mask port->mctrl with
TIOCM_RTS too and not only TIOCM_DTR.

Signed-off-by: Giulio Benetti <giulio.bene...@micronovasrl.com>
---
 drivers/tty/serial/serial_core.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0466f9f08a91..06d9441f6d20 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2288,6 +2288,16 @@ uart_configure_port(struct uart_driver *drv, struct 
uart_state *state,
 
        if (port->type != PORT_UNKNOWN) {
                unsigned long flags;
+               int rs485_on = port->rs485_config &&
+                       (port->rs485.flags & SER_RS485_ENABLED);
+               int RTS_after_send = !!(port->rs485.flags &
+                               SER_RS485_RTS_AFTER_SEND);
+               int mctrl;
+
+               if (rs485_on && RTS_after_send)
+                       mctrl = port->mctrl & (TIOCM_DTR | TIOCM_RTS);
+               else
+                       mctrl = port->mctrl & TIOCM_DTR;
 
                uart_report_port(drv, port);
 
@@ -2300,7 +2310,7 @@ uart_configure_port(struct uart_driver *drv, struct 
uart_state *state,
                 * We probably don't need a spinlock around this, but
                 */
                spin_lock_irqsave(&port->lock, flags);
-               port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
+               port->ops->set_mctrl(port, mctrl);
                spin_unlock_irqrestore(&port->lock, flags);
 
                /*
-- 
2.17.0