linux-kernel - [PATCH] serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup

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Date: Wed, 24 Apr 2024 20:32:47 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-serial@...r.kernel.org,
	Hsin-Te Yuan <yuanhsinte@...omium.org>,
	linux-kernel@...r.kernel.org,
	Al Cooper <alcooperx@...cast.net>,
	Archie Pusaka <apusaka@...omium.org>,
	KidmanLee <kidman@...ltek.com>,
	Hilda Wu <hildawu@...ltek.com>,
	Pin-yen Lin <treapking@...omium.org>,
	Chen-Yu Tsai <wenst@...omium.org>,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH] serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup

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")
Signed-off-by: Pin-yen Lin <treapking@...omium.org>

---

 drivers/tty/serial/8250/8250_mtk.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index c365a349421a..b7ed55eaf05b 100644
--- 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_port *port)
 
 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_set_mctrl(&up->port, TIOCM_RTS);
 }
 
 static void mtk8250_disable_intrs(struct uart_8250_port *up, int mask)
-- 
2.44.0.769.g3c40516874-goog