linux-kernel - Re: [PATCH v1 12/14] thermal: uniphier: Use thermal_zone_for_each

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Date: Tue, 18 Jun 2024 13:03:51 +0900
From: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Linux PM <linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Lukasz Luba <lukasz.luba@....com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v1 12/14] thermal: uniphier: Use
 thermal_zone_for_each_trip() for walking trip points

Hi Rafael,

On 2024/06/18 3:07, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> It is generally inefficient to iterate over trip indices and call
> thermal_zone_get_trip() every time to get the struct thermal_trip
> corresponding to the given trip index, so modify the uniphier thermal
> driver to use thermal_zone_for_each_trip() for walking trips.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>   drivers/thermal/uniphier_thermal.c |   37
> +++++++++++++++++++++++--------------
>   1 file changed, 23 insertions(+), 14 deletions(-)
> 
> Index: linux-pm/drivers/thermal/uniphier_thermal.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/uniphier_thermal.c
> +++ linux-pm/drivers/thermal/uniphier_thermal.c
> @@ -239,13 +239,32 @@ static irqreturn_t uniphier_tm_alarm_irq
>   	return IRQ_HANDLED;
>   }
> 
> +struct trip_walk_data {
> +	struct uniphier_tm_dev *tdev;
> +	int crit_temp;
> +	int index;
> +};
> +
> +static int uniphier_tm_trip_walk_cb(struct thermal_trip *trip, void *arg)
> +{
> +	struct trip_walk_data *twd = arg;
> +
> +	if (trip->type == THERMAL_TRIP_CRITICAL &&
> +	    trip->temperature < twd->crit_temp)
> +		twd->crit_temp = trip->temperature;
> +
> +	uniphier_tm_set_alert(twd->tdev, twd->index, trip->temperature);
> +	twd->tdev->alert_en[twd->index++] = true;
> +}
> +
>   static int uniphier_tm_probe(struct platform_device *pdev)
>   {
> +	struct trip_walk_data twd = { .crit_temp = INT_MAX, .index = 0 };
>   	struct device *dev = &pdev->dev;
>   	struct regmap *regmap;
>   	struct device_node *parent;
>   	struct uniphier_tm_dev *tdev;
> -	int i, ret, irq, crit_temp = INT_MAX;
> +	int i, ret, irq;
> 
>   	tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
>   	if (!tdev)
> @@ -293,20 +312,10 @@ static int uniphier_tm_probe(struct plat
>   	}
> 
>   	/* set alert temperatures */
> -	for (i = 0; i < thermal_zone_get_num_trips(tdev->tz_dev); i++) {
> -		struct thermal_trip trip;
> +	twd.tdev = tdev;
> +	thermal_zone_for_each_trip(tdev->tz_dev, uniphier_tm_trip_walk_cb, &twd);
> 
> -		ret = thermal_zone_get_trip(tdev->tz_dev, i, &trip);
> -		if (ret)
> -			return ret;
> -
> -		if (trip.type == THERMAL_TRIP_CRITICAL &&
> -		    trip.temperature < crit_temp)
> -			crit_temp = trip.temperature;
> -		uniphier_tm_set_alert(tdev, i, trip.temperature);
> -		tdev->alert_en[i] = true;
> -	}
> -	if (crit_temp > CRITICAL_TEMP_LIMIT) {
> +	if (twd.crit_temp > CRITICAL_TEMP_LIMIT) {
>   		dev_err(dev, "critical trip is over limit(>%d), or not set\n",
>   			CRITICAL_TEMP_LIMIT);
>   		return -EINVAL;

I confirmed the updated code using the helper function is equivalent
to the original.

Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>

Thank you,

---
Best Regards
Kunihiko Hayashi