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This patch allows RS485 Half Duplex (ATMEL_US_USMODE_RS485 is half duplex) to
work even if handshaking is turned on. This mimics the behavior of the EXAR
USB/Serial driver known as Vizzini. It is impossible to use handshaking when
using ATMEL_US_USMODE_RS485. This provides compatibility between MTCDT-0.1 and
MTCDT-0.2.
=======================================================================================
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 28d4a92c0d63..2d17558a807d 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -2250,6 +2250,9 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_TTGR,
port->rs485.delay_rts_after_send);
mode |= ATMEL_US_USMODE_RS485;
+ /* CRTSCTS is impossible in RS485 mode, and breaks the driver
+ * so we cannot do a send. */
+ termios->c_cflag &= ~CRTSCTS;
} else if (port->iso7816.flags & SER_ISO7816_ENABLED) {
atmel_uart_writel(port, ATMEL_US_TTGR, port->iso7816.tg);
/* select mck clock, and output */
--
2.25.1
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