Provide thermal zone to read thermal sensor in the SoC. We can read all the
thermal sensors value in the SoC by the node /sys/class/thermal/
In mtk_thermal_bank_temperature, return -EAGAIN instead of -EACCESS
on the first read of sensor that often are bogus values.
This can avoid following warning on boot:
thermal thermal_zone6: failed to read out thermal zone (-13)
Signed-off-by: Michael Kao <michael.kao@xxxxxxxxxxxx>
Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@xxxxxxxxxxxx>
---
Changes in V4:
- Use callback for raw_to_mcelsius()
- Use struct 'struct thermal_zone_device_ops' instead of
no longer existent 'struct thermal_zone_of_device_ops'
drivers/thermal/mtk_thermal.c | 104 ++++++++++++++++++++++++++--------
1 file changed, 79 insertions(+), 25 deletions(-)
diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 3a5df1440822..311ad611fdab 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -259,6 +259,11 @@ enum mtk_thermal_version {
struct mtk_thermal;
+struct mtk_thermal_zone {
+ struct mtk_thermal *mt;
+ int id;
+};
+
struct thermal_bank_cfg {
unsigned int num_sensors;
const int *sensors;
@@ -307,6 +312,8 @@ struct mtk_thermal {
const struct mtk_thermal_data *conf;
struct mtk_thermal_bank banks[MAX_NUM_ZONES];
+
+ int (*raw_to_mcelsius)(struct mtk_thermal *mt, int sensno, s32 raw);
};
/* MT8183 thermal sensor data */
@@ -709,6 +716,29 @@ static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
mutex_unlock(&mt->lock);
}
+static int _get_sensor_temp(struct mtk_thermal *mt, int id)
+{
+ u32 raw;
+ int temp;
+
+ const struct mtk_thermal_data *conf = mt->conf;
+
+ raw = readl(mt->thermal_base + conf->msr[id]);
+
+ temp = mt->raw_to_mcelsius(mt, id, raw);
+
+ /*
+ * The first read of a sensor often contains very high bogus
+ * temperature value. Filter these out so that the system does
+ * not immediately shut down.
+ */
+
+ if (temp > 200000)
+ return -EAGAIN;
+ else
+ return temp;
+}
+
/**
* mtk_thermal_bank_temperature - get the temperature of a bank
* @bank: The bank
@@ -721,26 +751,9 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
struct mtk_thermal *mt = bank->mt;
const struct mtk_thermal_data *conf = mt->conf;
int i, temp = INT_MIN, max = INT_MIN;
- u32 raw;
for (i = 0; i < conf->bank_data[bank->id].num_sensors; i++) {
- raw = readl(mt->thermal_base + conf->msr[i]);
-
- if (mt->conf->version == MTK_THERMAL_V1) {
- temp = raw_to_mcelsius_v1(
- mt, conf->bank_data[bank->id].sensors[i], raw);
- } else {
- temp = raw_to_mcelsius_v2(
- mt, conf->bank_data[bank->id].sensors[i], raw);
- }
-
- /*
- * The first read of a sensor often contains very high bogus
- * temperature value. Filter these out so that the system does
- * not immediately shut down.
- */
- if (temp > 200000)
- temp = 0;
+ temp = _get_sensor_temp(mt, i);
if (temp > max)
max = temp;
@@ -749,9 +762,10 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
return max;
}
-static int mtk_read_temp(struct thermal_zone_device *tz, int *temperature)
+static int mtk_read_temp(struct thermal_zone_device *tzdev, int *temperature)
{
- struct mtk_thermal *mt = tz->devdata;
+ struct mtk_thermal_zone *tz = tzdev->devdata;
+ struct mtk_thermal *mt = tz->mt;
int i;
int tempmax = INT_MIN;
@@ -770,10 +784,28 @@ static int mtk_read_temp(struct thermal_zone_device *tz, int *temperature)
return 0;
}
+static int mtk_read_sensor_temp(struct thermal_zone_device *tzdev, int *temperature)
+{
+ struct mtk_thermal_zone *tz = tzdev->devdata;
+ struct mtk_thermal *mt = tz->mt;
+ int id = tz->id - 1;
+
+ if (id < 0)
+ return -EACCES;
+
+ *temperature = _get_sensor_temp(mt, id);
+
+ return 0;
+}
+
static const struct thermal_zone_device_ops mtk_thermal_ops = {
.get_temp = mtk_read_temp,
};
+static const struct thermal_zone_device_ops mtk_thermal_sensor_ops = {
+ .get_temp = mtk_read_sensor_temp,
+};
+
static void mtk_thermal_init_bank(struct mtk_thermal *mt, int num,
u32 apmixed_phys_base, u32 auxadc_phys_base,
int ctrl_id)
@@ -1072,6 +1104,7 @@ static int mtk_thermal_probe(struct platform_device *pdev)
u64 auxadc_phys_base, apmixed_phys_base;
struct thermal_zone_device *tzdev;
void __iomem *apmixed_base, *auxadc_base;
+ struct mtk_thermal_zone *tz;
mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL);
if (!mt)
@@ -1150,6 +1183,9 @@ static int mtk_thermal_probe(struct platform_device *pdev)
mtk_thermal_turn_on_buffer(mt, apmixed_base);
+ mt->raw_to_mcelsius = (mt->conf->version == MTK_THERMAL_V1) ?
+ raw_to_mcelsius_v1 : raw_to_mcelsius_v2;
+
if (mt->conf->version == MTK_THERMAL_V2) {
mtk_thermal_release_periodic_ts(mt, auxadc_base);
}
@@ -1161,11 +1197,29 @@ static int mtk_thermal_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, mt);
- tzdev = devm_thermal_of_zone_register(&pdev->dev, 0, mt,
- &mtk_thermal_ops);
- if (IS_ERR(tzdev)) {
- ret = PTR_ERR(tzdev);
- goto err_disable_clk_peri_therm;
+ for (i = 0; i < mt->conf->num_sensors + 1; i++) {
+ tz = devm_kmalloc(&pdev->dev, sizeof(*tz), GFP_KERNEL);
+ if (!tz)
+ return -ENOMEM;
+
+ tz->mt = mt;
+ tz->id = i;
+
+ tzdev = devm_thermal_of_zone_register(&pdev->dev, i, tz, (i == 0) ?
+ &mtk_thermal_ops :
+ &mtk_thermal_sensor_ops);
+
+ if (IS_ERR(tzdev)) {
+ if (PTR_ERR(tzdev) == -ENODEV) {
+ dev_warn(&pdev->dev,
+ "sensor %d not registered in thermal zone in dt\n", i);
+ continue;
+ }
+ if (PTR_ERR(tzdev) == -EACCES) {
+ ret = PTR_ERR(tzdev);
+ goto err_disable_clk_peri_therm;
+ }
+ }
}
ret = devm_thermal_add_hwmon_sysfs(tzdev);
--
2.37.3
