linux-kernel - Re: [PATCH 2/2] serial: 8250_omap: mark the serial as on the wakeup path if no_console

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Message-ID: <CAPDyKFpnsV-c4F7SNPQmLBSM1sUknr-3sTyiXMDt9n43UBQkNg@mail.gmail.com>
Date: Wed, 9 Oct 2024 12:50:43 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Thomas Richard <thomas.richard@...tlin.com>
Cc: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, 
	Santosh Shilimkar <ssantosh@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Jiri Slaby <jirislaby@...nel.org>, linux-arm-kernel@...ts.infradead.org, 
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org, u-kumar1@...com, tony@...mide.com, 
	khilman@...nel.org, gregory.clement@...tlin.com, thomas.petazzoni@...tlin.com, 
	theo.lebrun@...tlin.com, richard.genoud@...tlin.com
Subject: Re: [PATCH 2/2] serial: 8250_omap: mark the serial as on the wakeup
 path if no_console_suspend

On Tue, 8 Oct 2024 at 11:34, Thomas Richard <thomas.richard@...tlin.com> wrote:
>
> If the console suspend is disabled, mark the serial as on the wakeup path
> to keep its PM domain powered on.
>
> Suggested-by: Théo Lebrun <theo.lebrun@...tlin.com>
> Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
> ---
>  drivers/tty/serial/8250/8250_omap.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
> index 88b58f44e4e9..6764fe2f9cad 100644
> --- a/drivers/tty/serial/8250/8250_omap.c
> +++ b/drivers/tty/serial/8250/8250_omap.c
> @@ -1660,8 +1660,12 @@ static int omap8250_suspend(struct device *dev)
>         if (!device_may_wakeup(dev))
>                 priv->wer = 0;
>         serial_out(up, UART_OMAP_WER, priv->wer);
> -       if (uart_console(&up->port) && console_suspend_enabled)
> -               err = pm_runtime_force_suspend(dev);
> +       if (uart_console(&up->port)) {
> +               if (console_suspend_enabled)
> +                       err = pm_runtime_force_suspend(dev);
> +               else
> +                       device_set_wakeup_path(dev);
> +       }

Isn't this already managed by the serial core? See commit a47cf07f60dc
("serial: core: Call device_set_awake_path() for console port")

[...]

Kind regards
Uffe