linux-kernel - Re: [PATCH 3/3] thermal/drivers/u8500: Remove the get

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Date:   Tue, 28 Jun 2022 10:40:36 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, rafael@...nel.org
Subject: Re: [PATCH 3/3] thermal/drivers/u8500: Remove the get_trend function


Adding Linus who is missing in the recipient list.


On 16/06/2022 22:25, Daniel Lezcano wrote:
> The get_trend function relies on the interrupt to set the raising or
> dropping trend. However the interpolated temperature is already giving
> the temperature information to the thermal framework which is able to
> deduce the trend.
> 
> Remove the trend code.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>   drivers/thermal/db8500_thermal.c | 26 ++++----------------------
>   1 file changed, 4 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c
> index 21d4d6e6409a..ed40cfd9ab7d 100644
> --- a/drivers/thermal/db8500_thermal.c
> +++ b/drivers/thermal/db8500_thermal.c
> @@ -53,7 +53,6 @@ static const unsigned long db8500_thermal_points[] = {
>   
>   struct db8500_thermal_zone {
>   	struct thermal_zone_device *tz;
> -	enum thermal_trend trend;
>   	unsigned long interpolated_temp;
>   	unsigned int cur_index;
>   };
> @@ -73,24 +72,12 @@ static int db8500_thermal_get_temp(void *data, int *temp)
>   	return 0;
>   }
>   
> -/* Callback to get temperature changing trend */
> -static int db8500_thermal_get_trend(void *data, int trip, enum thermal_trend *trend)
> -{
> -	struct db8500_thermal_zone *th = data;
> -
> -	*trend = th->trend;
> -
> -	return 0;
> -}
> -
>   static struct thermal_zone_of_device_ops thdev_ops = {
>   	.get_temp = db8500_thermal_get_temp,
> -	.get_trend = db8500_thermal_get_trend,
>   };
>   
>   static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
>   					 unsigned int idx,
> -					 enum thermal_trend trend,
>   					 unsigned long next_low,
>   					 unsigned long next_high)
>   {
> @@ -98,7 +85,6 @@ static void db8500_thermal_update_config(struct db8500_thermal_zone *th,
>   
>   	th->cur_index = idx;
>   	th->interpolated_temp = (next_low + next_high)/2;
> -	th->trend = trend;
>   
>   	/*
>   	 * The PRCMU accept absolute temperatures in celsius so divide
> @@ -127,8 +113,7 @@ static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
>   	}
>   	idx -= 1;
>   
> -	db8500_thermal_update_config(th, idx, THERMAL_TREND_DROPPING,
> -				     next_low, next_high);
> +	db8500_thermal_update_config(th, idx, next_low, next_high);
>   	dev_dbg(&th->tz->device,
>   		"PRCMU set max %ld, min %ld\n", next_high, next_low);
>   
> @@ -149,8 +134,7 @@ static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
>   		next_low = db8500_thermal_points[idx];
>   		idx += 1;
>   
> -		db8500_thermal_update_config(th, idx, THERMAL_TREND_RAISING,
> -					     next_low, next_high);
> +		db8500_thermal_update_config(th, idx, next_low, next_high);
>   
>   		dev_dbg(&th->tz->device,
>   			"PRCMU set max %ld, min %ld\n", next_high, next_low);
> @@ -210,8 +194,7 @@ static int db8500_thermal_probe(struct platform_device *pdev)
>   	dev_info(dev, "thermal zone sensor registered\n");
>   
>   	/* Start measuring at the lowest point */
> -	db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
> -				     PRCMU_DEFAULT_LOW_TEMP,
> +	db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
>   				     db8500_thermal_points[0]);
>   
>   	platform_set_drvdata(pdev, th);
> @@ -232,8 +215,7 @@ static int db8500_thermal_resume(struct platform_device *pdev)
>   	struct db8500_thermal_zone *th = platform_get_drvdata(pdev);
>   
>   	/* Resume and start measuring at the lowest point */
> -	db8500_thermal_update_config(th, 0, THERMAL_TREND_STABLE,
> -				     PRCMU_DEFAULT_LOW_TEMP,
> +	db8500_thermal_update_config(th, 0, PRCMU_DEFAULT_LOW_TEMP,
>   				     db8500_thermal_points[0]);
>   
>   	return 0;


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