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

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Date:   Fri, 27 Aug 2021 09:53:36 +0200
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM: domains: Fix domain attach for CONFIG_PM_OPP=n

Hi Geert,

Thanks for your work.

On 2021-08-24 17:23:38 +0200, Geert Uytterhoeven 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: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  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
> 

-- 
Regards,
Niklas Söderlund