linux-kernel - Re: [PATCH 5/8] thermal:cpu cooling:tegra: Provide deferred probing for tegra driver

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Date:	Mon, 17 Nov 2014 12:40:35 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Lukasz Majewski <l.majewski@...sung.com>
Cc:	Eduardo Valentin <edubezval@...il.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@...com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Nobuhiro Iwamatsu <iwamatsu@...auri.org>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] thermal:cpu cooling:tegra: Provide deferred probing
 for tegra driver

On Thu, Nov 13, 2014 at 06:02:42PM +0100, Lukasz Majewski wrote:
> When CPU freq is used as a thermal zone cooling device, one needs to wait
> until cpufreq subsystem is properly initialized.
> 
> This code is similar to the one already available in imx_thermal.c file.
> 
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> ---
>  drivers/thermal/tegra_soctherm.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/thermal/tegra_soctherm.c b/drivers/thermal/tegra_soctherm.c
> index 70f7e9e..9c5aaa4 100644
> --- a/drivers/thermal/tegra_soctherm.c
> +++ b/drivers/thermal/tegra_soctherm.c
> @@ -26,6 +26,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/reset.h>
>  #include <linux/thermal.h>
> +#include <linux/cpufreq.h>
>  
>  #include <soc/tegra/fuse.h>
>  
> @@ -346,6 +347,12 @@ static int tegra_soctherm_probe(struct platform_device *pdev)
>  
>  	const struct tegra_tsensor *tsensors = t124_tsensors;
>  
> +#ifdef CONFIG_CPU_THERMAL
> +	if (!cpufreq_get_current_driver()) {
> +		dev_dbg(&pdev->dev, "no cpufreq driver!");

Shouldn't this rather be dev_err() or dev_warn() to give at least some
clue as to the cause?

Thierry

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