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Message-ID: <729667920f755d073217a5c52bfe4e20166cce80.camel@mediatek.com>
Date: Thu, 6 May 2021 13:14:31 +0800
From: Michael Kao <michael.kao@...iatek.com>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
<fan.chen@...iatek.com>, "Zhang Rui" <rui.zhang@...el.com>,
<linux-pm@...r.kernel.org>, <srv_heupstream@...iatek.com>,
<Ben.Tseng@...iatek.com>
CC: Eduardo Valentin <edubezval@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"Matthias Brugger" <matthias.bgg@...il.com>, <hsinyi@...omium.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>
Subject: Re: [v7,3/3] thermal: mediatek: add another get_temp ops for
thermal sensors
Hi Maintainers,
Gentle pin for this patch.
Thanks
On Fri, 2021-04-09 at 10:16 +0200, Daniel Lezcano wrote:
> On 16/03/2021 08:01, Michael Kao 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)
>
> This patch is changing more things than described in the changelog.
>
> Is it possible to share some technical details about how the
> sensor(s)
> are working or point to some documentation if any ? and possibly the
> layout ?
>
> IIUC there is a fake thermal zone zero with the purpose of
> aggregating
> all the other sensors by taking the max temperature of all the
> sensors.
>
> This patch adds a thermal zone per sensor, and each sensor is per
> CPU.
> CPU0 being actually the max of all the other sensors, right ?
>
>
> > Signed-off-by: Michael Kao <michael.kao@...iatek.com>
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > ---
> > drivers/thermal/mtk_thermal.c | 100 +++++++++++++++++++++++++-----
> > ----
> > 1 file changed, 75 insertions(+), 25 deletions(-)
> >
> > diff --git a/drivers/thermal/mtk_thermal.c
> > b/drivers/thermal/mtk_thermal.c
> > index 149c6d7fd5a0..57e4f08a947e 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 +642,30 @@ 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;
> > +
> > + raw = readl(mt->thermal_base + mt->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
> > @@ -647,28 +676,11 @@ static void mtk_thermal_put_bank(struct
> > mtk_thermal_bank *bank)
> > 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);
> > - }
> > + for (i = 0; i < mt->conf->bank_data[bank->id].num_sensors; i++)
> > {
> >
> > - /*
> > - * 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 +691,8 @@ 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 +711,28 @@ 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 +1023,7 @@ 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 +1112,29 @@ 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 = devm_kmalloc(&pdev->dev, 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_therm
> > al_ops :
> > + &mtk_therm
> > al_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;
> >
>
>
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