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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>