linux-kernel - Re: [PATCH v3 02/12] opp: Filter out OPPs based on availability of a required-OPP

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Date:   Mon, 18 Jan 2021 13:41:47 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 02/12] opp: Filter out OPPs based on availability of a
 required-OPP

On 18-01-21, 03:55, Dmitry Osipenko wrote:
> A required OPP may not be available, and thus, all OPPs which are using
> this required OPP should be unavailable too.
> 
> Tested-by: Peter Geis <pgwipeout@...il.com>
> Tested-by: Nicolas Chauvet <kwizart@...il.com>
> Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/opp/core.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index 48618ff3e99e..7b4d07279638 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -1522,6 +1522,7 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
>  	     struct opp_table *opp_table, bool rate_not_available)
>  {
>  	struct list_head *head;
> +	unsigned int i;
>  	int ret;
>  
>  	mutex_lock(&opp_table->lock);
> @@ -1547,6 +1548,16 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
>  			 __func__, new_opp->rate);
>  	}
>  
> +	for (i = 0; i < opp_table->required_opp_count; i++) {
> +		if (new_opp->required_opps[i]->available)
> +			continue;
> +
> +		new_opp->available = false;
> +		dev_warn(dev, "%s: OPP not supported by required OPP %pOF (%lu)\n",
> +			 __func__, new_opp->required_opps[i]->np, new_opp->rate);
> +		break;
> +	}
> +
>  	return 0;
>  }

Applied. Thanks.

Though I am concerned about who will enable this back again if the
required-opp comes back. And I am not sure if we should even care
about that.

-- 
viresh