linux-kernel - Re: [PATCH] thermal: exynos: handle gate clock for misplaced TRIMINFO register

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Message-ID: <20140210103354.GT25314@e106331-lin.cambridge.arm.com>
Date:	Mon, 10 Feb 2014 10:33:54 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"naveenkrishna.ch@...il.com" <naveenkrishna.ch@...il.com>,
	"rui.zhang@...el.com" <rui.zhang@...el.com>,
	"eduardo.valentin@...com" <eduardo.valentin@...com>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"amit.daniel@...sung.com" <amit.daniel@...sung.com>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"b.zolnierkie@...sung.com" <b.zolnierkie@...sung.com>,
	"cpgs@...sung.com" <cpgs@...sung.com>
Subject: Re: [PATCH] thermal: exynos: handle gate clock for misplaced
 TRIMINFO register

On Thu, Nov 07, 2013 at 12:42:34PM +0000, Naveen Krishna Chatradhi wrote:
> On Exynos5420 the TMU(4) for GPU has a seperate clock enable bit from
> the other TMU channels(0 ~ 3). Hence, accessing TRIMINFO for base_second
> should be acompanied by enabling the respective clock.
> 
> This patch which allow for a "clk_sec" clock to be specified in the
> device-tree which will be ungated when accessing the TRIMINFO register.

Missing binding document update? Or was "clk_sec" originally in the
binding but unused? 

The code seems to expect "tmu_apbif_sec" as the clock name in the DT,
but this isn't mentioned in the commit message. 

I grepped Documentation/devicetree in mainline, but found no reference
of either.

Thanks,
Mark.

> 
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
> ---
>  drivers/thermal/samsung/exynos_tmu.c |   24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index b54825a..33edd1a 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -47,6 +47,7 @@
>   * @irq_work: pointer to the irq work structure.
>   * @lock: lock to implement synchronization.
>   * @clk: pointer to the clock structure.
> + * @clk_sec: pointer to the clock structure for accessing the base_second.
>   * @temp_error1: fused value of the first point trim.
>   * @temp_error2: fused value of the second point trim.
>   * @regulator: pointer to the TMU regulator structure.
> @@ -61,7 +62,7 @@ struct exynos_tmu_data {
>  	enum soc_type soc;
>  	struct work_struct irq_work;
>  	struct mutex lock;
> -	struct clk *clk;
> +	struct clk *clk, *clk_sec;
>  	u8 temp_error1, temp_error2;
>  	struct regulator *regulator;
>  	struct thermal_sensor_conf *reg_conf;
> @@ -152,6 +153,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>  
>  	mutex_lock(&data->lock);
>  	clk_enable(data->clk);
> +	if (!IS_ERR(data->clk_sec))
> +		clk_enable(data->clk_sec);
>  
>  	if (TMU_SUPPORTS(pdata, READY_STATUS)) {
>  		status = readb(data->base + reg->tmu_status);
> @@ -306,6 +309,8 @@ skip_calib_data:
>  out:
>  	clk_disable(data->clk);
>  	mutex_unlock(&data->lock);
> +	if (!IS_ERR(data->clk_sec))
> +		clk_disable(data->clk_sec);
>  
>  	return ret;
>  }
> @@ -457,12 +462,16 @@ static void exynos_tmu_work(struct work_struct *work)
>  	const struct exynos_tmu_registers *reg = pdata->registers;
>  	unsigned int val_irq, val_type;
>  
> +	if (!IS_ERR(data->clk_sec))
> +		clk_enable(data->clk_sec);
>  	/* Find which sensor generated this interrupt */
>  	if (reg->tmu_irqstatus) {
>  		val_type = readl(data->base_second + reg->tmu_irqstatus);
>  		if (!((val_type >> data->id) & 0x1))
>  			goto out;
>  	}
> +	if (!IS_ERR(data->clk_sec))
> +		clk_disable(data->clk_sec);
>  
>  	exynos_report_trigger(data->reg_conf);
>  	mutex_lock(&data->lock);
> @@ -641,6 +650,15 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> +	data->clk_sec = devm_clk_get(&pdev->dev, "tmu_apbif_sec");
> +	if (!IS_ERR(data->clk_sec)) {
> +		ret = clk_prepare(data->clk_sec);
> +		if (ret) {
> +			dev_err(&pdev->dev, "Failed to get clock\n");
> +			return  PTR_ERR(data->clk_sec);
> +		}
> +	}
> +
>  	if (pdata->type == SOC_ARCH_EXYNOS4210 ||
>  	    pdata->type == SOC_ARCH_EXYNOS4412 ||
>  	    pdata->type == SOC_ARCH_EXYNOS5250 ||
> @@ -713,6 +731,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
>  	return 0;
>  err_clk:
>  	clk_unprepare(data->clk);
> +	if (!IS_ERR(data->clk_sec))
> +		clk_unprepare(data->clk_sec);
>  	return ret;
>  }
>  
> @@ -725,6 +745,8 @@ static int exynos_tmu_remove(struct platform_device *pdev)
>  	exynos_unregister_thermal(data->reg_conf);
>  
>  	clk_unprepare(data->clk);
> +	if (!IS_ERR(data->clk_sec))
> +		clk_unprepare(data->clk_sec);
>  
>  	if (!IS_ERR(data->regulator))
>  		regulator_disable(data->regulator);
> -- 
> 1.7.10.4
> 
> --
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