[PATCH 6.1 007/473] serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup

Greg Kroah-Hartman
2024-06-06T14:12:46Z

From: Pin-yen Lin <treapking@chromium.org>

commit 4244f830a56058ee0670d80e7ac9fd7c982eb480 upstream.

When Rx in-band wakeup is enabled, set RTS to true in mtk8250_shutdown()
so the connected device can still send message and trigger IRQ when the
system is suspended.

Fixes: 18c9d4a3c249 ("serial: When UART is suspended, set RTS to false")
Cc: stable <stable@kernel.org>
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Link: https://lore.kernel.org/r/20240424130619.2924456-1-treapking@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/8250/8250_mtk.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -209,15 +209,19 @@ static int mtk8250_startup(struct uart_p

static void mtk8250_shutdown(struct uart_port *port)
{
-#ifdef CONFIG_SERIAL_8250_DMA
struct uart_8250_port *up = up_to_u8250p(port);
struct mtk8250_data *data = port->private_data;
+ int irq = data->rx_wakeup_irq;

+#ifdef CONFIG_SERIAL_8250_DMA
if (up->dma)
data->rx_status = DMA_RX_SHUTDOWN;
#endif

- return serial8250_do_shutdown(port);
+ serial8250_do_shutdown(port);
+
+ if (irq >= 0)
+ serial8250_do_set_mctrl(&up->port, TIOCM_RTS);
}

static void mtk8250_disable_intrs(struct uart_8250_port *up, int mask)