Make sure the transmitter and receiver are stopped when shutting down
the port, to avoid new RX DMA requests to arrive.
Inspired by a patch in the BSP by Koji Matsuoka
<koji.matsuoka.xm@xxxxxxxxxxx>.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v3:
- No changes,
v2:
- New.
---
drivers/tty/serial/sh-sci.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index d8b73e791a554823..0622cafaf1c71cab 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1820,12 +1820,16 @@ static void sci_shutdown(struct uart_port *port)
{
struct sci_port *s = to_sci_port(port);
unsigned long flags;
+ u16 scscr;
dev_dbg(port->dev, "%s(%d)\n", __func__, port->line);
spin_lock_irqsave(&port->lock, flags);
sci_stop_rx(port);
sci_stop_tx(port);
+ scscr = serial_port_in(port, SCSCR);
+ scscr &= ~(SCSCR_TE | SCSCR_RE);
+ serial_port_out(port, SCSCR, scscr);
spin_unlock_irqrestore(&port->lock, flags);
sci_free_dma(port);
--
1.9.1
--
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