On 2024-03-22 05:06, Tony Lindgren wrote: [...] > I can't reproduce this on qemu-system-sparc64, probably as it does not use > the sunsab driver. > > I noticed something though, I think we need to test for the port device > instead for being runtime PM enabled. > > Can you please test if the updated patch below make things work again? Yes, with the below patch applied on top of 6.8 things are working. Thanks, Nick > 8< ------------------- > diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c > --- a/drivers/tty/serial/serial_core.c > +++ b/drivers/tty/serial/serial_core.c > @@ -156,7 +156,7 @@ static void __uart_start(struct uart_state *state) > * enabled, serial_port_runtime_resume() calls start_tx() again > * after enabling the device. > */ > - if (pm_runtime_active(&port_dev->dev)) > + if (!pm_runtime_enabled(port->dev) || pm_runtime_active(&port_dev->dev)) > port->ops->start_tx(port); > pm_runtime_mark_last_busy(&port_dev->dev); > pm_runtime_put_autosuspend(&port_dev->dev)
