This is a note to let you know that I've just added the patch titled
serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup
to the 6.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8520_mtk-set-rts-on-shutdown-for-rx-in-band-wakeup.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4244f830a56058ee0670d80e7ac9fd7c982eb480 Mon Sep 17 00:00:00 2001
From: Pin-yen Lin <treapking@xxxxxxxxxxxx>
Date: Wed, 24 Apr 2024 20:58:08 +0800
Subject: serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup
From: Pin-yen Lin <treapking@xxxxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240424130619.2924456-1-treapking@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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)
Patches currently in stable-queue which might be from treapking@xxxxxxxxxxxx are
queue-6.9/serial-8520_mtk-set-rts-on-shutdown-for-rx-in-band-wakeup.patch
