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Message-ID: <CAEXTbpd2zLdk-VmkGvpk2_Qz0TDyC9aOsQbCz=FpopnMqs9djg@mail.gmail.com>
Date: Tue, 15 Nov 2022 18:49:40 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Amjad Ouled-Ameur <aouledameur@...libre.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Zhang Rui <rui.zhang@...el.com>,
Amit Kucheria <amitk@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Fabien Parent <fparent@...libre.com>,
linux-mediatek@...ts.infradead.org, Rob Herring <robh@...nel.org>,
Markus Schneider-Pargmann <msp@...libre.com>,
linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Michael Kao <michael.kao@...iatek.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH v6 4/4] thermal: mediatek: add another get_temp ops for
thermal sensors
Hi Amjad,
On Wed, Oct 19, 2022 at 10:17 PM Amjad Ouled-Ameur
<aouledameur@...libre.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@...iatek.com>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Signed-off-by: Amjad Ouled-Ameur <aouledameur@...libre.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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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