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Date: Tue, 15 Nov 2022 14:46:41 +0100
From: Amjad Ouled-Ameur <aouledameur@...libre.com>
To: Pin-yen Lin <treapking@...omium.org>
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 Pin-yen,
On 11/15/22 11:49, Pin-yen Lin wrote:
> 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.
Good catch, will fix this in next rev.
Regards,
Amjad
> Regards,
> Pin-yen
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