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Date:   Sat, 2 Sep 2017 10:09:15 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rui.zhang@...el.com, edubezval@...il.com, linux-pm@...r.kernel.org,
        kevin.wangtao@...aro.org, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/13] thermal/drivers/hisi: Encapsulate register writes
 into helpers

On Wed, Aug 30, 2017 at 10:47:31AM +0200, Daniel Lezcano wrote:
> Hopefully, the function name can help to clarify the semantic of the operations
> when writing in the register.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/hisi_thermal.c | 96 +++++++++++++++++++++++++++++++-----------
>  1 file changed, 72 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
> index 6f0dab1..d77a938 100644
> --- a/drivers/thermal/hisi_thermal.c
> +++ b/drivers/thermal/hisi_thermal.c
> @@ -26,6 +26,7 @@
>  
>  #include "thermal_core.h"
>  
> +#define TEMP0_LAG			(0x0)
>  #define TEMP0_TH			(0x4)
>  #define TEMP0_RST_TH			(0x8)
>  #define TEMP0_CFG			(0xC)
> @@ -96,6 +97,56 @@ static inline long hisi_thermal_round_temp(int temp)
>  		hisi_thermal_temp_to_step(temp));
>  }
>  
> +static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
> +{
> +	writel(value, addr + TEMP0_LAG);
> +}
> +
> +static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
> +{
> +	writel(value, addr + TEMP0_INT_CLR);
> +}
> +
> +static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value)
> +{
> +	writel(value, addr + TEMP0_INT_EN);
> +}
> +
> +static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp)
> +{
> +	writel(hisi_thermal_temp_to_step(temp) | 0x0FFFFFF00, addr + TEMP0_TH);
> +}
> +
> +static inline void hisi_thermal_reset_set(void __iomem *addr, int temp)
> +{
> +        writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH);
> +}
> +
> +static inline void hisi_thermal_reset_enable(void __iomem *addr, int value)
> +{
> +        writel(value, addr + TEMP0_RST_MSK);
> +}
> +
> +static inline void hisi_thermal_enable(void __iomem *addr, int value)
> +{
> +	writel(value, addr + TEMP0_EN);
> +}
> +
> +static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
> +{
> +	writel((sensor << 12), addr + TEMP0_CFG);
> +}
> +
> +static inline int hisi_thermal_get_temperature(void __iomem *addr)
> +{
> +	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
> +}
> +
> +static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
> +{
> +	writel(value, addr + TEMP0_CFG);
> +}

hdak and sensor id setting share the same one register, so it's
possible to overwrite their value with each other. And for hdak
setting, it should offset 4 bits.

The issues are exists in old code yet but not introduce by this
patch. Could fix these issues as well in this patch?

> +
>  static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
>  					 struct hisi_thermal_sensor *sensor)
>  {
> @@ -104,22 +155,21 @@ static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
>  	mutex_lock(&data->thermal_lock);
>  
>  	/* disable interrupt */
> -	writel(0x0, data->regs + TEMP0_INT_EN);
> -	writel(0x1, data->regs + TEMP0_INT_CLR);
> +	hisi_thermal_alarm_enable(data->regs, 0);
> +	hisi_thermal_alarm_clear(data->regs, 1);
>  
>  	/* disable module firstly */
> -	writel(0x0, data->regs + TEMP0_EN);
> +	hisi_thermal_enable(data->regs, 0);
>  
>  	/* select sensor id */
> -	writel((sensor->id << 12), data->regs + TEMP0_CFG);
> +	hisi_thermal_sensor_select(data->regs, sensor->id);
>  
>  	/* enable module */
> -	writel(0x1, data->regs + TEMP0_EN);
> +	hisi_thermal_enable(data->regs, 1);
>  
>  	usleep_range(3000, 5000);
>  
> -	val = readl(data->regs + TEMP0_VALUE);
> -	val = hisi_thermal_step_to_temp(val);
> +	val = hisi_thermal_get_temperature(data->regs);
>  
>  	mutex_unlock(&data->thermal_lock);
>  
> @@ -136,29 +186,27 @@ static void hisi_thermal_enable_bind_irq_sensor
>  	sensor = &data->sensors;
>  
>  	/* setting the hdak time */
> -	writel(0x0, data->regs + TEMP0_CFG);
> +	hisi_thermal_hdak_set(data->regs, 0);
>  
>  	/* disable module firstly */
> -	writel(0x0, data->regs + TEMP0_RST_MSK);
> -	writel(0x0, data->regs + TEMP0_EN);
> +	hisi_thermal_reset_enable(data->regs, 0);
> +	hisi_thermal_enable(data->regs, 0);
>  
>  	/* select sensor id */
> -	writel((sensor->id << 12), data->regs + TEMP0_CFG);
> +	hisi_thermal_sensor_select(data->regs, sensor->id);
>  
>  	/* enable for interrupt */
> -	writel(hisi_thermal_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00,
> -	       data->regs + TEMP0_TH);
> +	hisi_thermal_alarm_set(data->regs, sensor->thres_temp);
>  
> -	writel(hisi_thermal_temp_to_step(HISI_TEMP_RESET),
> -	       data->regs + TEMP0_RST_TH);
> +	hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);
>  
>  	/* enable module */
> -	writel(0x1, data->regs + TEMP0_RST_MSK);
> -	writel(0x1, data->regs + TEMP0_EN);
> -
> -	writel(0x0, data->regs + TEMP0_INT_CLR);
> -	writel(0x1, data->regs + TEMP0_INT_EN);
> +	hisi_thermal_reset_enable(data->regs, 1);
> +	hisi_thermal_enable(data->regs, 1);
>  
> +	hisi_thermal_alarm_clear(data->regs, 0);
> +	hisi_thermal_alarm_enable(data->regs, 1);
> +	

whitespace error.

>  	usleep_range(3000, 5000);
>  
>  	mutex_unlock(&data->thermal_lock);
> @@ -169,10 +217,10 @@ static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
>  	mutex_lock(&data->thermal_lock);
>  
>  	/* disable sensor module */
> -	writel(0x0, data->regs + TEMP0_INT_EN);
> -	writel(0x0, data->regs + TEMP0_RST_MSK);
> -	writel(0x0, data->regs + TEMP0_EN);
> -
> +	hisi_thermal_enable(data->regs, 0);
> +	hisi_thermal_alarm_enable(data->regs, 0);
> +	hisi_thermal_reset_enable(data->regs, 0);
> +	

whitespace error.

>  	mutex_unlock(&data->thermal_lock);
>  }
>  
> -- 
> 2.7.4
> 

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