Thermal control fixes for 6.10-rc1

- Fix and clean up the MediaTek lvts_thermal driver (Julien Panis).
 
  - Prevent invalid trip point handling from triggering spurious trip
    point crossing events and allow passive polling to stop when a
    passive trip point involved in it becomes invalid (Rafael Wysocki).
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Merge tag 'thermal-6.10-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull thermal control fixes from Rafael Wysocki:
 "These fix the MediaTek lvts_thermal driver and the handling of trip
  points that start as invalid and are adjusted later by user space via
  sysfs.

  Specifics:

   - Fix and clean up the MediaTek lvts_thermal driver (Julien Panis)

   - Prevent invalid trip point handling from triggering spurious trip
     point crossing events and allow passive polling to stop when a
     passive trip point involved in it becomes invalid (Rafael Wysocki)"

* tag 'thermal-6.10-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  thermal: core: Fix the handling of invalid trip points
  thermal/drivers/mediatek/lvts_thermal: Fix wrong lvts_ctrl index
  thermal/drivers/mediatek/lvts_thermal: Remove unused members from struct lvts_ctrl_data
  thermal/drivers/mediatek/lvts_thermal: Check NULL ptr on lvts_data

drivers/thermal/mediatek/lvts_thermal.c

@@ -105,8 +105,6 @@ struct lvts_sensor_data {
 
 struct lvts_ctrl_data {
 	struct lvts_sensor_data lvts_sensor[LVTS_SENSOR_MAX];
-	int cal_offset[LVTS_SENSOR_MAX];
-	int num_lvts_sensor;
 	u8 valid_sensor_mask;
 	int offset;
 	int mode;
@@ -118,9 +116,9 @@ struct lvts_ctrl_data {
 			      ((s2) ? BIT(2) : 0) | \
 			      ((s3) ? BIT(3) : 0))
 
-#define lvts_for_each_valid_sensor(i, lvts_ctrl_data) \
+#define lvts_for_each_valid_sensor(i, lvts_ctrl) \
 	for ((i) = 0; (i) < LVTS_SENSOR_MAX; (i)++) \
-		if (!((lvts_ctrl_data)->valid_sensor_mask & BIT(i))) \
+		if (!((lvts_ctrl)->valid_sensor_mask & BIT(i))) \
 			continue; \
 		else
 
@@ -147,6 +145,7 @@ struct lvts_ctrl {
 	const struct lvts_data *lvts_data;
 	u32 calibration[LVTS_SENSOR_MAX];
 	u32 hw_tshut_raw_temp;
+	u8 valid_sensor_mask;
 	int mode;
 	void __iomem *base;
 	int low_thresh;
@@ -358,7 +357,7 @@ static bool lvts_should_update_thresh(struct lvts_ctrl *lvts_ctrl, int high)
 	if (high > lvts_ctrl->high_thresh)
 		return true;
 
-	lvts_for_each_valid_sensor(i, lvts_ctrl->lvts_data->lvts_ctrl)
+	lvts_for_each_valid_sensor(i, lvts_ctrl)
 		if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
 		    && lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
 			return false;
@@ -619,6 +618,8 @@ static int lvts_sensor_init(struct device *dev, struct lvts_ctrl *lvts_ctrl,
 		lvts_sensor[i].high_thresh = INT_MIN;
 	};
 
+	lvts_ctrl->valid_sensor_mask = lvts_ctrl_data->valid_sensor_mask;
+
 	return 0;
 }
 
@@ -1114,7 +1115,7 @@ static int lvts_ctrl_start(struct device *dev, struct lvts_ctrl *lvts_ctrl)
 	u32 *sensor_bitmap = lvts_ctrl->mode == LVTS_MSR_IMMEDIATE_MODE ?
 			     sensor_imm_bitmap : sensor_filt_bitmap;
 
-	lvts_for_each_valid_sensor(i, lvts_ctrl->lvts_data->lvts_ctrl) {
+	lvts_for_each_valid_sensor(i, lvts_ctrl) {
 
 		int dt_id = lvts_sensors[i].dt_id;
 
@@ -1271,6 +1272,8 @@ static int lvts_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	lvts_data = of_device_get_match_data(dev);
+	if (!lvts_data)
+		return -ENODEV;
 
 	lvts_td->clk = devm_clk_get_enabled(dev, NULL);
 	if (IS_ERR(lvts_td->clk))

drivers/thermal/thermal_core.c

@@ -1398,8 +1398,15 @@ thermal_zone_device_register_with_trips(const char *type,
 	tz->device.class = thermal_class;
 	tz->devdata = devdata;
 	tz->num_trips = num_trips;
-	for_each_trip_desc(tz, td)
+	for_each_trip_desc(tz, td) {
 		td->trip = *trip++;
+		/*
+		 * Mark all thresholds as invalid to start with even though
+		 * this only matters for the trips that start as invalid and
+		 * become valid later.
+		 */
+		td->threshold = INT_MAX;
+	}
 
 	thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
 	thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay);

drivers/thermal/thermal_trip.c

@@ -152,6 +152,24 @@ void thermal_zone_set_trip_temp(struct thermal_zone_device *tz,
 	if (trip->temperature == temp)
 		return;
 
+	if (temp == THERMAL_TEMP_INVALID) {
+		struct thermal_trip_desc *td = trip_to_trip_desc(trip);
+
+		if (trip->type == THERMAL_TRIP_PASSIVE &&
+		    tz->temperature >= td->threshold) {
+			/*
+			 * The trip has been crossed, so the thermal zone's
+			 * passive count needs to be adjusted.
+			 */
+			tz->passive--;
+			WARN_ON_ONCE(tz->passive < 0);
+		}
+		/*
+		 * Invalidate the threshold to avoid triggering a spurious
+		 * trip crossing notification when the trip becomes valid.
+		 */
+		td->threshold = INT_MAX;
+	}
 	trip->temperature = temp;
 	thermal_notify_tz_trip_change(tz, trip);
 }