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serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup

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BugLink: https://bugs.launchpad.net/bugs/2071621

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: 18c9d4a3c2 ("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: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Pin-yen Lin
2024-04-24 20:58:08 +08:00
committed by Stefan Bader
parent 9d2e866d4b
commit 6659d55bbe
1 changed files with 6 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/tty/serial/8250/8250_mtk.c
+6 -2
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@@ -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)