linux-kernel - [PATCH v1 10/14] thermal: tegra: Use thermal_zone_for_each

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Date: Mon, 17 Jun 2024 20:03:59 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>, Lukasz Luba <lukasz.luba@....com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>, linux-tegra@...r.kernel.org
Subject:
 [PATCH v1 10/14] thermal: tegra: Use thermal_zone_for_each_trip() for walking
 trip points

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 Tegra thermal
drivers to use thermal_zone_for_each_trip() for walking trips.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/tegra/soctherm.c        |   38 ++++++++++++++++----------------
 drivers/thermal/tegra/tegra30-tsensor.c |   25 ++++++++++-----------
 2 files changed, 33 insertions(+), 30 deletions(-)

Index: linux-pm/drivers/thermal/tegra/soctherm.c
===================================================================
--- linux-pm.orig/drivers/thermal/tegra/soctherm.c
+++ linux-pm/drivers/thermal/tegra/soctherm.c
@@ -683,24 +683,25 @@ static const struct thermal_zone_device_
 	.set_trips = tegra_thermctl_set_trips,
 };
 
-static int get_hot_temp(struct thermal_zone_device *tz, int *trip_id, int *temp)
+static int get_hot_trip_cb(struct thermal_trip *trip, void *arg)
 {
-	int i, ret;
-	struct thermal_trip trip;
+	const struct thermal_trip **trip_ret = arg;
 
-	for (i = 0; i < thermal_zone_get_num_trips(tz); i++) {
+	if (trip->type != THERMAL_TRIP_HOT)
+		return 0;
 
-		ret = thermal_zone_get_trip(tz, i, &trip);
-		if (ret)
-			return -EINVAL;
-
-		if (trip.type == THERMAL_TRIP_HOT) {
-			*trip_id = i;
-			return 0;
-		}
-	}
+	*trip_ret = trip;
+	/* Return nonzero to terminate the search. */
+	return 1;
+}
 
-	return -EINVAL;
+static const struct thermal_trip *get_hot_trip(struct thermal_zone_device *tz)
+{
+	const struct thermal_trip *trip = NULL;
+
+	thermal_zone_for_each_trip(tz, get_hot_trip_cb, &trip);
+
+	return trip;
 }
 
 /**
@@ -732,8 +733,9 @@ static int tegra_soctherm_set_hwtrips(st
 				      struct thermal_zone_device *tz)
 {
 	struct tegra_soctherm *ts = dev_get_drvdata(dev);
+	const struct thermal_trip *hot_trip;
 	struct soctherm_throt_cfg *stc;
-	int i, trip, temperature, ret;
+	int i, temperature, ret;
 
 	/* Get thermtrips. If missing, try to get critical trips. */
 	temperature = tsensor_group_thermtrip_get(ts, sg->id);
@@ -750,8 +752,8 @@ static int tegra_soctherm_set_hwtrips(st
 	dev_info(dev, "thermtrip: will shut down when %s reaches %d mC\n",
 		 sg->name, temperature);
 
-	ret = get_hot_temp(tz, &trip, &temperature);
-	if (ret) {
+	hot_trip = get_hot_trip(tz);
+	if (!hot_trip) {
 		dev_info(dev, "throttrip: %s: missing hot temperature\n",
 			 sg->name);
 		return 0;
@@ -764,7 +766,7 @@ static int tegra_soctherm_set_hwtrips(st
 			continue;
 
 		cdev = ts->throt_cfgs[i].cdev;
-		if (get_thermal_instance(tz, cdev, trip))
+		if (thermal_trip_is_bound_to_cdev(tz, hot_trip, cdev))
 			stc = find_throttle_cfg_by_name(ts, cdev->type);
 		else
 			continue;
Index: linux-pm/drivers/thermal/tegra/tegra30-tsensor.c
===================================================================
--- linux-pm.orig/drivers/thermal/tegra/tegra30-tsensor.c
+++ linux-pm/drivers/thermal/tegra/tegra30-tsensor.c
@@ -308,6 +308,18 @@ struct trip_temps {
 	int crit_trip;
 };
 
+static int tegra_tsensor_get_trips_cb(struct thermal_trip *trip, void *arg)
+{
+	struct trip_temps *temps = arg;
+
+	if (trip->type == THERMAL_TRIP_HOT)
+		temps->hot_trip = trip->temperature;
+	else if (trip->type == THERMAL_TRIP_CRITICAL)
+		temps->crit_trip = trip->temperature;
+
+	return 0;
+}
+
 static void tegra_tsensor_get_hw_channel_trips(struct thermal_zone_device *tzd,
 					       struct trip_temps *temps)
 {
@@ -320,18 +332,7 @@ static void tegra_tsensor_get_hw_channel
 	temps->hot_trip  = 85000;
 	temps->crit_trip = 90000;
 
-	for (i = 0; i < thermal_zone_get_num_trips(tzd); i++) {
-
-		struct thermal_trip trip;
-
-		thermal_zone_get_trip(tzd, i, &trip);
-
-		if (trip.type == THERMAL_TRIP_HOT)
-			temps->hot_trip = trip.temperature;
-
-		if (trip.type == THERMAL_TRIP_CRITICAL)
-			temps->crit_trip = trip.temperature;
-	}
+	thermal_zone_for_each_trip(tzd, tegra_tsensor_get_trips_cb, temps);
 
 	/* clamp hardware trips to the calibration limits */
 	temps->hot_trip = clamp(temps->hot_trip, 25000, 90000);