linux-kernel - Re: [PATCH] thermal: stm32: read factory settings inside stm_thermal

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Date:   Fri, 14 Dec 2018 17:47:34 -0800
From:   Eduardo Valentin <edubezval@...il.com>
To:     David HERNANDEZ SANCHEZ <david.hernandezsanchez@...com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH] thermal: stm32: read factory settings inside
 stm_thermal_prepare


On Thu, Dec 06, 2018 at 01:23:32PM +0000, David HERNANDEZ SANCHEZ wrote:
> Calling stm_thermal_read_factory_settings before clocking
> internal peripheral causes bad register values and makes
> temperature computation wrong.
> 
> Calling stm_thermal_read_factory_settings inside
> stm_thermal_prepare fixes this problem as internal
> peripheral is well clocked at this stage.
> 
> Signed-off-by: David Hernandez Sanchez <david.hernandezsanchez@...com>
> Fixes: 1d693155 ("thermal: add stm32 thermal driver")

Please append patch version in the title next time to help tracking it.

> 
> diff --git a/drivers/thermal/st/stm_thermal.c b/drivers/thermal/st/stm_thermal.c
> index 47623da..daa1257 100644
> --- a/drivers/thermal/st/stm_thermal.c
> +++ b/drivers/thermal/st/stm_thermal.c
> @@ -532,6 +532,10 @@ static int stm_thermal_prepare(struct stm_thermal_sensor *sensor)
>  	if (ret)
>  		return ret;
>  
> +	ret = stm_thermal_read_factory_settings(sensor);
> +	if (ret)
> +		goto thermal_unprepare;
> +
>  	ret = stm_thermal_calibration(sensor);
>  	if (ret)
>  		goto thermal_unprepare;
> @@ -636,10 +640,6 @@ static int stm_thermal_probe(struct platform_device *pdev)
>  	/* Populate sensor */
>  	sensor->base = base;
>  
> -	ret = stm_thermal_read_factory_settings(sensor);
> -	if (ret)
> -		return ret;
> -
>  	sensor->clk = devm_clk_get(&pdev->dev, "pclk");
>  	if (IS_ERR(sensor->clk)) {
>  		dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n",
> -- 
> 2.7.4