linux-kernel - [PATCH 09/11] thermal: exynos: split initialization of TMU and the thermal zone

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Message-ID: <20230829091853.626011-10-m.majewski2@samsung.com>
Date:   Tue, 29 Aug 2023 11:18:47 +0200
From:   Mateusz Majewski <m.majewski2@...sung.com>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Cc:     Mateusz Majewski <m.majewski2@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH 09/11] thermal: exynos: split initialization of TMU and the
 thermal zone

This will be needed in the future, as the thermal zone subsystem might
call our callbacks right after devm_thermal_of_zone_register. Currently
we just make get_temp return EAGAIN in such case, but this will not be
possible with state-modifying callbacks, for instance set_trips.

Signed-off-by: Mateusz Majewski <m.majewski2@...sung.com>
---
 drivers/thermal/samsung/exynos_tmu.c | 78 ++++++++++++++++------------
 1 file changed, 45 insertions(+), 33 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index 6c107fe9fd27..aa3de367b3c7 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -250,20 +250,43 @@ static void sanitize_temp_error(struct exynos_tmu_data *data, u32 trim_info)
 }
 
 static int exynos_tmu_initialize(struct platform_device *pdev)
+{
+	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
+	unsigned int status;
+	int ret = 0;
+
+	mutex_lock(&data->lock);
+
+	status = readb(data->base + EXYNOS_TMU_REG_STATUS);
+	if (!status) {
+		ret = -EBUSY;
+	} else {
+		data->tmu_initialize(pdev);
+		data->tmu_clear_irqs(data);
+	}
+
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int exynos_thermal_zone_configure(struct platform_device *pdev)
 {
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct thermal_zone_device *tzd = data->tzd;
 	int num_trips = thermal_zone_get_num_trips(tzd);
-	unsigned int status;
 	int ret = 0, temp;
 
 	ret = thermal_zone_get_crit_temp(tzd, &temp);
+
 	if (ret && data->soc != SOC_ARCH_EXYNOS5433) { /* FIXME */
 		dev_err(&pdev->dev,
 			"No CRITICAL trip point defined in device tree!\n");
-		goto out;
+		goto err;
 	}
 
+	mutex_lock(&data->lock);
+
 	if (num_trips > data->ntrip) {
 		dev_info(&pdev->dev,
 			 "More trip points than supported by this TMU.\n");
@@ -272,36 +295,23 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
 			 num_trips - data->ntrip);
 	}
 
-	mutex_lock(&data->lock);
+	int i, ntrips = min_t(int, num_trips, data->ntrip);
 
-	status = readb(data->base + EXYNOS_TMU_REG_STATUS);
-	if (!status) {
-		ret = -EBUSY;
-	} else {
-		int i, ntrips =
-			min_t(int, num_trips, data->ntrip);
+	/* Write temperature code for rising and falling threshold */
+	for (i = 0; i < ntrips; i++) {
+		struct thermal_trip trip;
 
-		data->tmu_initialize(pdev);
+		ret = thermal_zone_get_trip(tzd, i, &trip);
+		if (ret)
+			goto err;
 
-		/* Write temperature code for rising and falling threshold */
-		for (i = 0; i < ntrips; i++) {
-
-			struct thermal_trip trip;
-
-			ret = thermal_zone_get_trip(tzd, i, &trip);
-			if (ret)
-				goto err;
-
-			data->tmu_set_trip_temp(data, i, trip.temperature / MCELSIUS);
-			data->tmu_set_trip_hyst(data, i, trip.temperature / MCELSIUS,
-						trip.hysteresis / MCELSIUS);
-		}
-
-		data->tmu_clear_irqs(data);
+		data->tmu_set_trip_temp(data, i, trip.temperature / MCELSIUS);
+		data->tmu_set_trip_hyst(data, i, trip.temperature / MCELSIUS,
+					trip.hysteresis / MCELSIUS);
 	}
-err:
+
 	mutex_unlock(&data->lock);
-out:
+err:
 	return ret;
 }
 
@@ -1006,10 +1016,12 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 		break;
 	}
 
-	/*
-	 * data->tzd must be registered before calling exynos_tmu_initialize(),
-	 * requesting irq and calling exynos_tmu_control().
-	 */
+	ret = exynos_tmu_initialize(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to initialize TMU\n");
+		return ret;
+	}
+
 	data->tzd = devm_thermal_of_zone_register(&pdev->dev, 0, data,
 						  &exynos_sensor_ops);
 	if (IS_ERR(data->tzd)) {
@@ -1020,9 +1032,9 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = exynos_tmu_initialize(pdev);
+	ret = exynos_thermal_zone_configure(pdev);
 	if (ret) {
-		dev_err(&pdev->dev, "Failed to initialize TMU\n");
+		dev_err(&pdev->dev, "Failed to configure the thermal zone\n");
 		return ret;
 	}
 
-- 
2.41.0