From: Biju Das <biju.das.jz@bp.renesas.com>
Date: Wed, 12 Apr 2023 14:50:53 +0000 (+0100)
Subject: tty: serial: sh-sci: Fix end of transmission on SCI
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f06c2a9000ebecbb461196e59ce063f742272902;p=linux.git

tty: serial: sh-sci: Fix end of transmission on SCI

We need to set TE to "0" (i.e., disable serial transmission) to
get the expected behavior of the end of serial transmission.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230412145053.114847-6-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 5c9ae69c0555d..7c9457962a3df 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -847,6 +847,11 @@ static void sci_transmit_chars(struct uart_port *port)
 		} else if (!uart_circ_empty(xmit) && !stopped) {
 			c = xmit->buf[xmit->tail];
 			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		} else if (port->type == PORT_SCI && uart_circ_empty(xmit)) {
+			ctrl = serial_port_in(port, SCSCR);
+			ctrl &= ~SCSCR_TE;
+			serial_port_out(port, SCSCR, ctrl);
+			return;
 		} else {
 			break;
 		}