[PATCH v6 4/4] thermal: mediatek: add another get_temp ops for thermal sensors

Pin-yen Lin treapking at chromium.org
Tue Nov 15 02:49:40 PST 2022


Hi Amjad,

On Wed, Oct 19, 2022 at 10:17 PM Amjad Ouled-Ameur
<aouledameur at baylibre.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 at mediatek.com>
> Signed-off-by: Hsin-Yi Wang <hsinyi at chromium.org>
> Signed-off-by: Amjad Ouled-Ameur <aouledameur at baylibre.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
> ---
>  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);
tzdev can be an error pointer here. I think we should move the line
into the loop above, so hwmon sysfs is not added when IS_ERR(tzdev) ==
true.

Regards,
Pin-yen



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