diff mbox series

[v5,3/3] thermal: mediatek: add another get_temp ops for thermal sensors

Message ID 20201013102358.22588-4-michael.kao@mediatek.com (mailing list archive)
State New, archived
Headers show
Series mt8183: Add Mediatek thermal driver and dtsi | expand

Commit Message

Michael Kao Oct. 13, 2020, 10:23 a.m. UTC
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@mediatek.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
 drivers/thermal/mtk_thermal.c | 99 +++++++++++++++++++++++++++--------
 1 file changed, 76 insertions(+), 23 deletions(-)

Comments

Nicolas Boichat Jan. 11, 2021, 12:39 a.m. UTC | #1
On Tue, Oct 13, 2020 at 6:24 PM Michael Kao <michael.kao@mediatek.com> wrote:
>
> 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@mediatek.com>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
>  drivers/thermal/mtk_thermal.c | 99 +++++++++++++++++++++++++++--------
>  1 file changed, 76 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index 0bd7aa564bc2..43c7bdbc147f 100644
> --- a/drivers/thermal/mtk_thermal.c
> +++ b/drivers/thermal/mtk_thermal.c
> @@ -245,6 +245,11 @@ 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;
> @@ -637,6 +642,32 @@ static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
>                 mutex_unlock(&mt->lock);
>  }
>
> +static u32 _get_sensor_temp(struct mtk_thermal *mt, int id)
> +{
> +       u32 raw;
> +       int temp;
> +
> +       const struct mtk_thermal_data *conf = mt->conf;

nit: You only use conf once, so I'd just use mt->conf->msr[id] below.

(or at least use conf->version instead of mt->conf->version just below)

> +
> +       raw = readl(mt->thermal_base + conf->msr[id]);
> +
> +       if (mt->conf->version == MTK_THERMAL_V1)
> +               temp = raw_to_mcelsius_v1(mt, id, raw);
> +       else
> +               temp = raw_to_mcelsius_v2(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;

nit: one space between return and -EAGAIN.

> +       else
> +               return  temp;

ditto.

> +}
> +
>  /**
>   * mtk_thermal_bank_temperature - get the temperature of a bank
>   * @bank:      The bank
> @@ -649,26 +680,10 @@ 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;

nit: Since this is now only used once, drop this variable?

>         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);

The new version of the code does this instead:
                       temp = raw_to_mcelsius_v1(mt, i, raw);

What's the difference between conf->bank_data[bank->id].sensors[i] and i?


> -               } 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;
> @@ -679,7 +694,8 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
>
>  static int mtk_read_temp(void *data, int *temperature)
>  {
> -       struct mtk_thermal *mt = data;
> +       struct mtk_thermal_zone *tz = data;
> +       struct mtk_thermal *mt = tz->mt;
>         int i;
>         int tempmax = INT_MIN;
>
> @@ -698,10 +714,28 @@ static int mtk_read_temp(void *data, int *temperature)
>         return 0;
>  }
>
> +static int mtk_read_sensor_temp(void *data, int *temperature)
> +{
> +       struct mtk_thermal_zone *tz = data;
> +       struct mtk_thermal *mt = tz->mt;
> +       int id = tz->id - 1;
> +
> +       if (id < 0)
> +               return  -EACCES;

nit: one space after return.

> +
> +       *temperature = _get_sensor_temp(mt, id);
> +
> +       return 0;
> +}
> +
>  static const struct thermal_zone_of_device_ops mtk_thermal_ops = {
>         .get_temp = mtk_read_temp,
>  };
>
> +static const struct thermal_zone_of_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)
> @@ -992,6 +1026,7 @@ 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)
> @@ -1080,11 +1115,29 @@ static int mtk_thermal_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, mt);
>
> -       tzdev = devm_thermal_zone_of_sensor_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 = kmalloc(sizeof(*tz), GFP_KERNEL);

I don't see those structures being freed on error, or on driver unbind.

Maybe use dev_kmalloc instead?

> +               if (!tz)
> +                       return -ENOMEM;
> +
> +               tz->mt = mt;
> +               tz->id = i;
> +
> +               tzdev = devm_thermal_zone_of_sensor_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;
> +                       }
> +               }
>         }
>
>         return 0;
> --
> 2.18.0
diff mbox series

Patch

diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
index 0bd7aa564bc2..43c7bdbc147f 100644
--- a/drivers/thermal/mtk_thermal.c
+++ b/drivers/thermal/mtk_thermal.c
@@ -245,6 +245,11 @@  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;
@@ -637,6 +642,32 @@  static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
 		mutex_unlock(&mt->lock);
 }
 
+static u32 _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]);
+
+	if (mt->conf->version == MTK_THERMAL_V1)
+		temp = raw_to_mcelsius_v1(mt, id, raw);
+	else
+		temp = raw_to_mcelsius_v2(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
@@ -649,26 +680,10 @@  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;
@@ -679,7 +694,8 @@  static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
 
 static int mtk_read_temp(void *data, int *temperature)
 {
-	struct mtk_thermal *mt = data;
+	struct mtk_thermal_zone *tz = data;
+	struct mtk_thermal *mt = tz->mt;
 	int i;
 	int tempmax = INT_MIN;
 
@@ -698,10 +714,28 @@  static int mtk_read_temp(void *data, int *temperature)
 	return 0;
 }
 
+static int mtk_read_sensor_temp(void *data, int *temperature)
+{
+	struct mtk_thermal_zone *tz = data;
+	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_of_device_ops mtk_thermal_ops = {
 	.get_temp = mtk_read_temp,
 };
 
+static const struct thermal_zone_of_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)
@@ -992,6 +1026,7 @@  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)
@@ -1080,11 +1115,29 @@  static int mtk_thermal_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mt);
 
-	tzdev = devm_thermal_zone_of_sensor_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 = kmalloc(sizeof(*tz), GFP_KERNEL);
+		if (!tz)
+			return -ENOMEM;
+
+		tz->mt = mt;
+		tz->id = i;
+
+		tzdev = devm_thermal_zone_of_sensor_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;
+			}
+		}
 	}
 
 	return 0;