linux-kernel - Re: [PATCH v2 1/5] thermal: stm32: remove hardware irq handler

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Date:   Wed, 4 Dec 2019 22:05:22 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Pascal Paillet <p.paillet@...com>, rui.zhang@...el.com,
        edubezval@...il.com, amit.kucheria@...durent.com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        david.hernandezsanchez@...com, horms+renesas@...ge.net.au,
        wsa+renesas@...g-engineering.com, linux-pm@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] thermal: stm32: remove hardware irq handler

On 04/11/2019 14:30, Pascal Paillet wrote:
> Remove hardware irq handler because it is not needed to disable the
> interrupt before the threaded handler. The goal is to simplify
> the code.

Please elaborate the explanation here. I guess all the code removed is
because of:

	/* read IT reason in SR and clear flags */
	value = readl_relaxed(sensor->base + DTS_SR_OFFSET);

Right?

> Change-Id: Ida967e8543c8dafc6a24508000f64f6405add31d

Remove Change-Id.

Missing SoB.

> ---
>  drivers/thermal/st/stm_thermal.c | 25 +------------------------
>  1 file changed, 1 insertion(+), 24 deletions(-)
> 
> diff --git a/drivers/thermal/st/stm_thermal.c b/drivers/thermal/st/stm_thermal.c
> index cf9ddc52f30e..31aa63fb3db1 100644
> --- a/drivers/thermal/st/stm_thermal.c
> +++ b/drivers/thermal/st/stm_thermal.c
> @@ -98,21 +98,10 @@ struct stm_thermal_sensor {
>  	unsigned int low_temp_enabled;
>  	int num_trips;
>  	int irq;
> -	unsigned int irq_enabled;
>  	void __iomem *base;
>  	int t0, fmt0, ramp_coeff;
>  };
>  
> -static irqreturn_t stm_thermal_alarm_irq(int irq, void *sdata)
> -{
> -	struct stm_thermal_sensor *sensor = sdata;
> -
> -	disable_irq_nosync(irq);
> -	sensor->irq_enabled = false;
> -
> -	return IRQ_WAKE_THREAD;
> -}
> -
>  static irqreturn_t stm_thermal_alarm_irq_thread(int irq, void *sdata)
>  {
>  	u32 value;
> @@ -464,16 +453,6 @@ static int stm_thermal_get_temp(void *data, int *temp)
>  			if (ret)
>  				return ret;
>  		}
> -
> -		/*
> -		 * Re-enable alarm IRQ if temperature below critical
> -		 * temperature
> -		 */
> -		if (!sensor->irq_enabled &&
> -		    (celsius(*temp) < sensor->temp_critical)) {
> -			sensor->irq_enabled = true;
> -			enable_irq(sensor->irq);
> -		}
>  	}
>  
>  	return 0;
> @@ -493,7 +472,7 @@ static int stm_register_irq(struct stm_thermal_sensor *sensor)
>  	}
>  
>  	ret = devm_request_threaded_irq(dev, sensor->irq,
> -					stm_thermal_alarm_irq,
> +					NULL,
>  					stm_thermal_alarm_irq_thread,
>  					IRQF_ONESHOT,
>  					dev->driver->name, sensor);
> @@ -503,8 +482,6 @@ static int stm_register_irq(struct stm_thermal_sensor *sensor)
>  		return ret;
>  	}
>  
> -	sensor->irq_enabled = true;
> -
>  	dev_dbg(dev, "%s: thermal IRQ registered", __func__);
>  
>  	return 0;
> 


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