From: Pin-yen Lin treapking@chromium.org
stable inclusion from stable-v6.6.33 commit e4a1d0aa0d4d5a7d52e9521fd7df1c6c3174b4de category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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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 Signed-off-by: Wang Hai wanghai38@huawei.com --- 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 74da5676ce67..28f9a2679a20 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_do_set_mctrl(&up->port, TIOCM_RTS); }
static void mtk8250_disable_intrs(struct uart_8250_port *up, int mask)