linux-kernel - Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device does not exist

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Date:   Tue, 12 Oct 2021 08:51:44 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Hector Martin <marcan@...can.st>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>, Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/9] opp: core: Don't warn if required OPP device
 does not exist

On 12-10-21, 01:57, Hector Martin wrote:
> When required-opps is used in CPU OPP tables, there is no parent power
> domain to drive it. Squelch this error, to allow a clock driver to
> handle this directly instead.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/opp/core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 04b4691a8aac..89e616721f70 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -873,12 +873,13 @@ static int _set_required_opp(struct device *dev, struct device *pd_dev,
>  		return 0;
>  
>  	ret = dev_pm_genpd_set_performance_state(pd_dev, pstate);
> -	if (ret) {
> +	if (ret && ret != -ENODEV) {
>  		dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",
>  			dev_name(pd_dev), pstate, ret);
> +		return ret;
>  	}
>  
> -	return ret;
> +	return 0;
>  }
>  
>  /* This is only called for PM domain for now */

I am not sure why you need this, since _set_required_opps() has this check:

	if (unlikely(!required_opp_tables[0]->is_genpd)) {
		dev_err(dev, "required-opps don't belong to a genpd\n");
		return -ENOENT;
	}

-- 
viresh