linux-kernel - Re: [PATCH v16 21/40] pwm: tegra: Add runtime PM and OPP support

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Message-ID: <677beebd-5a16-297f-c09a-fa4b72c001c9@gmail.com>
Date:   Mon, 21 Feb 2022 12:53:58 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Lee Jones <lee.jones@...aro.org>, Nishanth Menon <nm@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-mmc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-clk@...r.kernel.org, David Heidelberg <david@...t.cz>
Subject: Re: [PATCH v16 21/40] pwm: tegra: Add runtime PM and OPP support

Hello Uwe,

21.02.2022 11:17, Uwe Kleine-König пишет:
>> @@ -344,7 +387,10 @@ static const struct of_device_id tegra_pwm_of_match[] = {
>>  MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
>>  
>>  static const struct dev_pm_ops tegra_pwm_pm_ops = {
>> -	SET_SYSTEM_SLEEP_PM_OPS(tegra_pwm_suspend, tegra_pwm_resume)
>> +	SET_RUNTIME_PM_OPS(tegra_pwm_runtime_suspend, tegra_pwm_runtime_resume,
>> +			   NULL)
>> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
>> +				pm_runtime_force_resume)
>>  };
>>  
>>  static struct platform_driver tegra_pwm_driver = {
> I admit to not completely understand the effects of this patch, but I
> don't see a problem either. So for me this patch is OK:
> 
> Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> I spot a problem, it's not introduced by this patch however: If the
> consumer of the PWM didn't stop the hardware, the suspend should IMHO be
> prevented.

Why? The PWM driver itself will stop the h/w on suspend.

> I wonder if the patches in this series go in in one go via an ARM or
> Tegra tree, or each patch via its respective maintainer tree.

This series, including this patch, was already applied to 5.17 via the
tegra/soc tree. No action is needed anymore.