thermal: Use mode helpers in drivers

Use thermal_zone_device_{en|dis}able() and thermal_zone_device_is_enabled().

Consequently, all set_mode() implementations in drivers:

- can stop modifying tzd's "mode" member,
- shall stop taking tzd's lock, as it is taken in the helpers
- shall stop calling thermal_zone_device_update() as it is called in the
helpers
- can assume they are called when the mode truly changes, so checks to
verify that can be dropped

Not providing set_mode() by a driver no longer prevents the core from
being able to set tzd's mode, so the relevant check in mode_store() is
removed.

Other comments:

- acpi/thermal.c: tz->thermal_zone->mode will be updated only after we
return from set_mode(), so use function parameter in thermal_set_mode()
instead, no need to call acpi_thermal_check() in set_mode()
- thermal/imx_thermal.c: regmap writes and mode assignment are done in
thermal_zone_device_{en|dis}able() and set_mode() callback
- thermal/intel/intel_quark_dts_thermal.c: soc_dts_{en|dis}able() are a
part of set_mode() callback, so they don't need to modify tzd->mode, and
don't need to fall back to the opposite mode if unsuccessful, as the return
value will be propagated to thermal_zone_device_{en|dis}able() and
ultimately tzd's member will not be changed in thermal_zone_device_set_mode().
- thermal/of-thermal.c: no need to set zone->mode to DISABLED in
of_parse_thermal_zones() as a tzd is kzalloc'ed so mode is DISABLED anyway

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
[for acerhdf]
Acked-by: Peter Kaestle <peter@piie.net>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200629122925.21729-8-andrzej.p@collabora.com

drivers/acpi/thermal.c

@@ -499,7 +499,7 @@ static void acpi_thermal_check(void *data)
 {
 	struct acpi_thermal *tz = data;
 
-	if (tz->thermal_zone->mode != THERMAL_DEVICE_ENABLED)
+	if (!thermal_zone_device_is_enabled(tz->thermal_zone))
 		return;
 
 	thermal_zone_device_update(tz->thermal_zone,
@@ -542,14 +542,11 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
 	if (mode == THERMAL_DEVICE_DISABLED)
 		pr_warn("thermal zone will be disabled\n");
 
-	if (mode != tz->thermal_zone->mode) {
-		tz->thermal_zone->mode = mode;
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-			"%s kernel ACPI thermal control\n",
-			tz->thermal_zone->mode == THERMAL_DEVICE_ENABLED ?
-			"Enable" : "Disable"));
-		acpi_thermal_check(tz);
-	}
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+		"%s kernel ACPI thermal control\n",
+		mode == THERMAL_DEVICE_ENABLED ?
+		"Enable" : "Disable"));
+
 	return 0;
 }
 
@@ -897,13 +894,17 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 		goto remove_dev_link;
 	}
 
-	tz->thermal_zone->mode = THERMAL_DEVICE_ENABLED;
+	result = thermal_zone_device_enable(tz->thermal_zone);
+	if (result)
+		goto acpi_bus_detach;
 
 	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
 		 tz->thermal_zone->id);
 
 	return 0;
 
+acpi_bus_detach:
+	acpi_bus_detach_private_data(tz->device->handle);
 remove_dev_link:
 	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
 remove_tz_link:

drivers/net/ethernet/mellanox/mlxsw/core_thermal.c

@@ -280,18 +280,11 @@ static int mlxsw_thermal_set_mode(struct thermal_zone_device *tzdev,
 {
 	struct mlxsw_thermal *thermal = tzdev->devdata;
 
-	mutex_lock(&tzdev->lock);
-
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
 	else
 		tzdev->polling_delay = 0;
 
-	tzdev->mode = mode;
-	mutex_unlock(&tzdev->lock);
-
-	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
-
 	return 0;
 }
 
@@ -458,19 +451,11 @@ static int mlxsw_thermal_module_mode_set(struct thermal_zone_device *tzdev,
 	struct mlxsw_thermal_module *tz = tzdev->devdata;
 	struct mlxsw_thermal *thermal = tz->parent;
 
-	mutex_lock(&tzdev->lock);
-
 	if (mode == THERMAL_DEVICE_ENABLED)
 		tzdev->polling_delay = thermal->polling_delay;
 	else
 		tzdev->polling_delay = 0;
 
-	tzdev->mode = mode;
-
-	mutex_unlock(&tzdev->lock);
-
-	thermal_zone_device_update(tzdev, THERMAL_EVENT_UNSPECIFIED);
-
 	return 0;
 }
 
@@ -756,8 +741,11 @@ mlxsw_thermal_module_tz_init(struct mlxsw_thermal_module *module_tz)
 		return err;
 	}
 
-	module_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
-	return 0;
+	err = thermal_zone_device_enable(module_tz->tzdev);
+	if (err)
+		thermal_zone_device_unregister(module_tz->tzdev);
+
+	return err;
 }
 
 static void mlxsw_thermal_module_tz_fini(struct thermal_zone_device *tzdev)
@@ -860,6 +848,7 @@ static int
 mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
 {
 	char tz_name[MLXSW_THERMAL_ZONE_MAX_NAME];
+	int ret;
 
 	snprintf(tz_name, sizeof(tz_name), "mlxsw-gearbox%d",
 		 gearbox_tz->module + 1);
@@ -872,8 +861,11 @@ mlxsw_thermal_gearbox_tz_init(struct mlxsw_thermal_module *gearbox_tz)
 	if (IS_ERR(gearbox_tz->tzdev))
 		return PTR_ERR(gearbox_tz->tzdev);
 
-	gearbox_tz->tzdev->mode = THERMAL_DEVICE_ENABLED;
-	return 0;
+	ret = thermal_zone_device_enable(gearbox_tz->tzdev);
+	if (ret)
+		thermal_zone_device_unregister(gearbox_tz->tzdev);
+
+	return ret;
 }
 
 static void
@@ -1041,10 +1033,15 @@ int mlxsw_thermal_init(struct mlxsw_core *core,
 	if (err)
 		goto err_unreg_modules_tzdev;
 
-	thermal->tzdev->mode = THERMAL_DEVICE_ENABLED;
+	err = thermal_zone_device_enable(thermal->tzdev);
+	if (err)
+		goto err_unreg_gearboxes;
+
 	*p_thermal = thermal;
 	return 0;
 
+err_unreg_gearboxes:
+	mlxsw_thermal_gearboxes_fini(thermal);
 err_unreg_modules_tzdev:
 	mlxsw_thermal_modules_fini(thermal);
 err_unreg_tzdev:

drivers/platform/x86/acerhdf.c

@@ -397,19 +397,16 @@ static inline void acerhdf_revert_to_bios_mode(void)
 {
 	acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
 	kernelmode = 0;
-	if (thz_dev) {
-		thz_dev->mode = THERMAL_DEVICE_DISABLED;
+	if (thz_dev)
 		thz_dev->polling_delay = 0;
-	}
+
 	pr_notice("kernel mode fan control OFF\n");
 }
 static inline void acerhdf_enable_kernelmode(void)
 {
 	kernelmode = 1;
-	thz_dev->mode = THERMAL_DEVICE_ENABLED;
 
 	thz_dev->polling_delay = interval*1000;
-	thermal_zone_device_update(thz_dev, THERMAL_EVENT_UNSPECIFIED);
 	pr_notice("kernel mode fan control ON\n");
 }
 
@@ -723,6 +720,8 @@ static void acerhdf_unregister_platform(void)
 
 static int __init acerhdf_register_thermal(void)
 {
+	int ret;
+
 	cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
 						 &acerhdf_cooling_ops);
 
@@ -736,8 +735,12 @@ static int __init acerhdf_register_thermal(void)
 	if (IS_ERR(thz_dev))
 		return -EINVAL;
 
-	thz_dev->mode = kernelmode ?
-		THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED;
+	if (kernelmode)
+		ret = thermal_zone_device_enable(thz_dev);
+	else
+		ret = thermal_zone_device_disable(thz_dev);
+	if (ret)
+		return ret;
 
 	if (strcmp(thz_dev->governor->name,
 				acerhdf_zone_params.governor_name)) {

drivers/thermal/da9062-thermal.c

@@ -237,7 +237,11 @@ static int da9062_thermal_probe(struct platform_device *pdev)
 		ret = PTR_ERR(thermal->zone);
 		goto err;
 	}
-	thermal->zone->mode = THERMAL_DEVICE_ENABLED;
+	ret = thermal_zone_device_enable(thermal->zone);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot enable thermal zone device\n");
+		goto err_zone;
+	}
 
 	dev_dbg(&pdev->dev,
 		"TJUNC temperature polling period set at %d ms\n",

drivers/thermal/hisi_thermal.c

@@ -549,8 +549,10 @@ static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
 {
 	struct thermal_zone_device *tzd = sensor->tzd;
 
-	tzd->ops->set_mode(tzd,
-		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
+	if (on)
+		thermal_zone_device_enable(tzd);
+	else
+		thermal_zone_device_disable(tzd);
 }
 
 static int hisi_thermal_probe(struct platform_device *pdev)

drivers/thermal/imx_thermal.c

@@ -255,7 +255,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 	bool wait;
 	u32 val;
 
-	if (tz->mode == THERMAL_DEVICE_ENABLED) {
+	if (thermal_zone_device_is_enabled(tz)) {
 		/* Check if a measurement is currently in progress */
 		regmap_read(map, soc_data->temp_data, &val);
 		wait = !(val & soc_data->temp_valid_mask);
@@ -282,7 +282,7 @@ static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
 
 	regmap_read(map, soc_data->temp_data, &val);
 
-	if (tz->mode != THERMAL_DEVICE_ENABLED) {
+	if (!thermal_zone_device_is_enabled(tz)) {
 		regmap_write(map, soc_data->sensor_ctrl + REG_CLR,
 			     soc_data->measure_temp_mask);
 		regmap_write(map, soc_data->sensor_ctrl + REG_SET,
@@ -365,9 +365,6 @@ static int imx_set_mode(struct thermal_zone_device *tz,
 		}
 	}
 
-	tz->mode = mode;
-	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
-
 	return 0;
 }
 
@@ -819,7 +816,9 @@ static int imx_thermal_probe(struct platform_device *pdev)
 		     data->socdata->measure_temp_mask);
 
 	data->irq_enabled = true;
-	data->tz->mode = THERMAL_DEVICE_ENABLED;
+	ret = thermal_zone_device_enable(data->tz);
+	if (ret)
+		goto thermal_zone_unregister;
 
 	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
 			imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
@@ -861,19 +860,18 @@ static int imx_thermal_remove(struct platform_device *pdev)
 static int __maybe_unused imx_thermal_suspend(struct device *dev)
 {
 	struct imx_thermal_data *data = dev_get_drvdata(dev);
-	struct regmap *map = data->tempmon;
+	int ret;
 
 	/*
 	 * Need to disable thermal sensor, otherwise, when thermal core
 	 * try to get temperature before thermal sensor resume, a wrong
 	 * temperature will be read as the thermal sensor is powered
-	 * down.
+	 * down. This is done in set_mode() operation called from
+	 * thermal_zone_device_disable()
 	 */
-	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
-		     data->socdata->measure_temp_mask);
-	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
-		     data->socdata->power_down_mask);
-	data->tz->mode = THERMAL_DEVICE_DISABLED;
+	ret = thermal_zone_device_disable(data->tz);
+	if (ret)
+		return ret;
 	clk_disable_unprepare(data->thermal_clk);
 
 	return 0;
@@ -882,18 +880,15 @@ static int __maybe_unused imx_thermal_suspend(struct device *dev)
 static int __maybe_unused imx_thermal_resume(struct device *dev)
 {
 	struct imx_thermal_data *data = dev_get_drvdata(dev);
-	struct regmap *map = data->tempmon;
 	int ret;
 
 	ret = clk_prepare_enable(data->thermal_clk);
 	if (ret)
 		return ret;
 	/* Enabled thermal sensor after resume */
-	regmap_write(map, data->socdata->sensor_ctrl + REG_CLR,
-		     data->socdata->power_down_mask);
-	regmap_write(map, data->socdata->sensor_ctrl + REG_SET,
-		     data->socdata->measure_temp_mask);
-	data->tz->mode = THERMAL_DEVICE_ENABLED;
+	ret = thermal_zone_device_enable(data->tz);
+	if (ret)
+		return ret;
 
 	return 0;
 }

drivers/thermal/intel/int340x_thermal/int3400_thermal.c

@@ -390,12 +390,11 @@ static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 	    mode != THERMAL_DEVICE_DISABLED)
 		return -EINVAL;
 
-	if (mode != thermal->mode) {
-		thermal->mode = mode;
+	if (mode != thermal->mode)
 		result = int3400_thermal_run_osc(priv->adev->handle,
 						priv->current_uuid_index,
 						mode == THERMAL_DEVICE_ENABLED);
-	}
+
 
 	evaluate_odvp(priv);
 

drivers/thermal/intel/intel_quark_dts_thermal.c

@@ -126,21 +126,16 @@ static int soc_dts_enable(struct thermal_zone_device *tzd)
 	if (ret)
 		return ret;
 
-	if (out & QRK_DTS_ENABLE_BIT) {
-		tzd->mode = THERMAL_DEVICE_ENABLED;
+	if (out & QRK_DTS_ENABLE_BIT)
 		return 0;
-	}
 
 	if (!aux_entry->locked) {
 		out |= QRK_DTS_ENABLE_BIT;
 		ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
 				     QRK_DTS_REG_OFFSET_ENABLE, out);
 		if (ret)
 			return ret;
-
-		tzd->mode = THERMAL_DEVICE_ENABLED;
 	} else {
-		tzd->mode = THERMAL_DEVICE_DISABLED;
 		pr_info("DTS is locked. Cannot enable DTS\n");
 		ret = -EPERM;
 	}
@@ -159,10 +154,8 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
 	if (ret)
 		return ret;
 
-	if (!(out & QRK_DTS_ENABLE_BIT)) {
-		tzd->mode = THERMAL_DEVICE_DISABLED;
+	if (!(out & QRK_DTS_ENABLE_BIT))
 		return 0;
-	}
 
 	if (!aux_entry->locked) {
 		out &= ~QRK_DTS_ENABLE_BIT;
@@ -171,10 +164,7 @@ static int soc_dts_disable(struct thermal_zone_device *tzd)
 
 		if (ret)
 			return ret;
-
-		tzd->mode = THERMAL_DEVICE_DISABLED;
 	} else {
-		tzd->mode = THERMAL_DEVICE_ENABLED;
 		pr_info("DTS is locked. Cannot disable DTS\n");
 		ret = -EPERM;
 	}
@@ -404,9 +394,7 @@ static struct soc_sensor_entry *alloc_soc_dts(void)
 		goto err_ret;
 	}
 
-	mutex_lock(&dts_update_mutex);
-	err = soc_dts_enable(aux_entry->tzone);
-	mutex_unlock(&dts_update_mutex);
+	err = thermal_zone_device_enable(aux_entry->tzone);
 	if (err)
 		goto err_aux_status;
 

drivers/thermal/rockchip_thermal.c

@@ -1068,8 +1068,10 @@ rockchip_thermal_toggle_sensor(struct rockchip_thermal_sensor *sensor, bool on)
 {
 	struct thermal_zone_device *tzd = sensor->tzd;
 
-	tzd->ops->set_mode(tzd,
-		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
+	if (on)
+		thermal_zone_device_enable(tzd);
+	else
+		thermal_zone_device_disable(tzd);
 }
 
 static irqreturn_t rockchip_thermal_alarm_irq_thread(int irq, void *dev)

drivers/thermal/sprd_thermal.c

@@ -322,8 +322,10 @@ static void sprd_thm_toggle_sensor(struct sprd_thermal_sensor *sen, bool on)
 {
 	struct thermal_zone_device *tzd = sen->tzd;
 
-	tzd->ops->set_mode(tzd,
-		on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
+	if (on)
+		thermal_zone_device_enable(tzd);
+	else
+		thermal_zone_device_disable(tzd);
 }
 
 static int sprd_thm_probe(struct platform_device *pdev)