--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -63,6 +63,7 @@
 #define CH341_REG_DIVISOR      0x13
 #define CH341_REG_LCR          0x18
 #define CH341_REG_LCR2         0x25
+#define CH341_REG_RTSCTS       0x27
 
 #define CH341_NBREAK_BITS      0x01
 
@@ -684,6 +685,7 @@ static int ch341_tiocmset(struct tty_struct *tty,
 	struct ch341_private *priv = usb_get_serial_port_data(port);
 	unsigned long flags;
 	u8 control;
+	int r;
 
 	spin_lock_irqsave(&priv->lock, flags);
 	if (set & TIOCM_RTS)
@@ -697,6 +699,17 @@ static int ch341_tiocmset(struct tty_struct *tty,
 	control = priv->mcr;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
+	if (tty->termios.c_cflag & CRTSCTS) {
+		r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
+			CH341_REG_RTSCTS | ((uint16_t)CH341_REG_RTSCTS << 8),
+			0x0101);
+		if (r < 0) {
+			dev_err(&port->dev, "%s - USB control write error (%d)\n",
+				__func__, r);
+			tty->termios.c_cflag &= ~CRTSCTS;
+		}
+	}
+
 	return ch341_set_handshake(port->serial->dev, control);
 }