linux-kernel - Re: [PATCH 03/13] opp: Keep track of currently programmed OPP

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Message-ID: <b634343a-8005-fc35-e38b-bfeaa7310a70@gmail.com>
Date:   Fri, 22 Jan 2021 00:41:46 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/13] opp: Keep track of currently programmed OPP

21.01.2021 14:17, Viresh Kumar пишет:
> @@ -1074,15 +1091,18 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
>  
>  	if (!ret) {
>  		ret = _set_opp_bw(opp_table, opp, dev, false);
> -		if (!ret)
> +		if (!ret) {
>  			opp_table->enabled = true;
> +			dev_pm_opp_put(old_opp);
> +
> +			/* Make sure current_opp doesn't get freed */
> +			dev_pm_opp_get(opp);
> +			opp_table->current_opp = opp;
> +		}
>  	}

I'm a bit surprised that _set_opp_bw() isn't used similarly to
_set_opp_voltage() in _generic_set_opp_regulator().

I'd expect the BW requirement to be raised before the clock rate goes UP.