linux-kernel - Re: [PATCH v4 1/2] cpufreq: tegra124: Remove use of disable

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Message-ID: <20250519101725.k644wzizjwygtwa7@vireshk-i7>
Date: Mon, 19 May 2025 15:47:25 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Jon Hunter <jonathanh@...dia.com>
Cc: webgeek1234@...il.com, "Rafael J. Wysocki" <rafael@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v4 1/2] cpufreq: tegra124: Remove use of disable_cpufreq

On 09-05-25, 12:04, Jon Hunter wrote:
> > diff --git a/drivers/cpufreq/tegra124-cpufreq.c b/drivers/cpufreq/tegra124-cpufreq.c
> > index 514146d98bca2d8aa59980a14dff3487cd8045f6..bc0691e8971f9454def37f489e4a3e244100b9f4 100644
> > --- a/drivers/cpufreq/tegra124-cpufreq.c
> > +++ b/drivers/cpufreq/tegra124-cpufreq.c
> > @@ -168,7 +168,10 @@ static int __maybe_unused tegra124_cpufreq_resume(struct device *dev)
> >   disable_dfll:
> >   	clk_disable_unprepare(priv->dfll_clk);
> >   disable_cpufreq:
> > -	disable_cpufreq();
> > +	if (!IS_ERR(priv->cpufreq_dt_pdev)) {
> > +		platform_device_unregister(priv->cpufreq_dt_pdev);
> > +		priv->cpufreq_dt_pdev = ERR_PTR(-ENODEV);
> > +	}
> 
> So you are proposing to unregister the device in resume? That seems odd. I
> see there is no remove for this driver, but I really don't see the value in
> this.

This is the failure path and the driver is trying to disable itself
here. Instead of using the disable_cpufreq() (which isn't designed for
this usecase), I suggested removing the device itself as the driver
will be unusable after this anyway.

-- 
viresh