1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 326020f86f75..9c57486c2e7f 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1910,6 +1910,12 @@ uart_set_options(struct uart_port *port, struct console *co,
         if (flow == 'r')
                 termios.c_cflag |= CRTSCTS;
 
+        /*
+         * some uarts on other side don't support no flow control.
+         * So we set * DTR in host uart to make them happy
+         */
+        port->mctrl |= TIOCM_DTR;
+
         port->ops->set_termios(port, &termios, NULL);
         co->cflag = termios.c_cflag;