linux-kernel - Re: [PATCH] PM: domains: Fix domain attach for CONFIG_PM

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Message-ID: <CAPDyKFrwxCH-AEDNnhwmoZ9aHZVzKw-=foo7F0mhMNLTCZxpYQ@mail.gmail.com>
Date:   Fri, 27 Aug 2021 15:23:10 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: domains: Fix domain attach for CONFIG_PM_OPP=n

On Tue, 24 Aug 2021 at 17:23, Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
>
> If CONFIG_PM_OPP=n, of_get_required_opp_performance_state() always
> returns -EOPNOTSUPP, and all drivers for devices that are part of a PM
> Domain fail to probe with:
>
>     failed to set required performance state for power-domain foo: -95
>     probe of bar failed with error -95
>
> Fix this by treating -EOPNOTSUPP the same as -ENODEV.
>
> Fixes: c016baf7dc58e77a ("PM: domains: Add support for 'required-opps' to set default perf state")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

Kind regards
Uffe

> ---
>  drivers/base/power/domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index a10d740c4f2a1c28..7b197690e6442911 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2760,7 +2760,7 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
>
>         /* Set the default performance state */
>         pstate = of_get_required_opp_performance_state(dev->of_node, index);
> -       if (pstate < 0 && pstate != -ENODEV) {
> +       if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
>                 ret = pstate;
>                 goto err;
>         } else if (pstate > 0) {
> --
> 2.25.1
>