linux-kernel - Re: [PATCH 11/13] devfreq: tegra30: Migrate to dev_pm_opp_set

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Message-ID: <71451eb2-46b2-1ea0-efcc-0811568159a4@gmail.com>
Date:   Fri, 22 Jan 2021 00:36:06 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 11/13] devfreq: tegra30: Migrate to dev_pm_opp_set_opp()

21.01.2021 14:17, Viresh Kumar пишет:
> dev_pm_opp_set_bw() is getting removed and dev_pm_opp_set_opp() should
> be used instead. Migrate to the new API.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/devfreq/tegra30-devfreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
> index 117cad7968ab..d2477d7d1f66 100644
> --- a/drivers/devfreq/tegra30-devfreq.c
> +++ b/drivers/devfreq/tegra30-devfreq.c
> @@ -647,7 +647,7 @@ static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
>  		return PTR_ERR(opp);
>  	}
>  
> -	ret = dev_pm_opp_set_bw(dev, opp);
> +	ret = dev_pm_opp_set_opp(dev, opp);
>  	dev_pm_opp_put(opp);
>  
>  	return ret;
> 

This patch introduces a very serious change that needs to be fixed.

Now dev_pm_opp_set_opp() changes both clock rate and bandwidth, this is
unacceptable for this driver because it shall not touch the clock rate.

I think dev_pm_opp_set_bw() can't be removed.