linux-kernel - RE: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors

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Date:   Wed, 31 May 2023 12:05:09 +0000
From:   Peng Fan <peng.fan@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "amitk@...nel.org" <amitk@...nel.org>,
        "rui.zhang@...el.com" <rui.zhang@...el.com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Alice Guo <alice.guo@....com>
Subject: RE: [PATCH 2/3] thermal: qoriq_thermal: only enable supported sensors

> Subject: Re: [PATCH 2/3] thermal: qoriq_thermal: only enable supported
> sensors
> 
> On 16/05/2023 10:37, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > There are MAX 16 sensors, but not all of them supported. Such as
> > i.MX8MQ, there are only 3 sensors. Enabling all 16 sensors will touch
> > reserved bits from i.MX8MQ reference mannual, and TMU will stuck,
> > temperature will not update anymore.
> >
> > Fixes: 45038e03d633 ("thermal: qoriq: Enable all sensors before
> > registering them")
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >   drivers/thermal/qoriq_thermal.c | 30 +++++++++++++++++++-----------
> >   1 file changed, 19 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/thermal/qoriq_thermal.c
> > b/drivers/thermal/qoriq_thermal.c index b806a0929459..53748c4a5be1
> > 100644
> > --- a/drivers/thermal/qoriq_thermal.c
> > +++ b/drivers/thermal/qoriq_thermal.c
> > @@ -31,7 +31,6 @@
> >   #define TMR_DISABLE	0x0
> >   #define TMR_ME		0x80000000
> >   #define TMR_ALPF	0x0c000000
> > -#define TMR_MSITE_ALL	GENMASK(15, 0)
> >
> >   #define REGS_TMTMIR	0x008	/* Temperature measurement
> interval Register */
> >   #define TMTMIR_DEFAULT	0x0000000f
> > @@ -105,6 +104,11 @@ static int tmu_get_temp(struct
> thermal_zone_device *tz, int *temp)
> >   	 * within sensor range. TEMP is an 9 bit value representing
> >   	 * temperature in KelVin.
> >   	 */
> > +
> > +	regmap_read(qdata->regmap, REGS_TMR, &val);
> > +	if (!(val & TMR_ME))
> > +		return -EAGAIN;
> 
> How is this change related to what is described in the changelog?

devm_thermal_zone_of_sensor_register will invoke get temp,
since we reverted the 45038e03d633 did, we need to check TMR_ME
to avoid return invalid temperature.

Regards,
Peng.

> 
> >   	if (regmap_read_poll_timeout(qdata->regmap,
> >   				     REGS_TRITSR(qsensor->id),
> >   				     val,
> > @@ -128,15 +132,7 @@ static const struct thermal_zone_device_ops
> tmu_tz_ops = {
> >   static int qoriq_tmu_register_tmu_zone(struct device *dev,
> >   				       struct qoriq_tmu_data *qdata)
> >   {
> > -	int id;
> > -
> > -	if (qdata->ver == TMU_VER1) {
> > -		regmap_write(qdata->regmap, REGS_TMR,
> > -			     TMR_MSITE_ALL | TMR_ME | TMR_ALPF);
> > -	} else {
> > -		regmap_write(qdata->regmap, REGS_V2_TMSR,
> TMR_MSITE_ALL);
> > -		regmap_write(qdata->regmap, REGS_TMR, TMR_ME |
> TMR_ALPF_V2);
> > -	}
> > +	int id, sites = 0;
> >
> >   	for (id = 0; id < SITES_MAX; id++) {
> >   		struct thermal_zone_device *tzd;
> > @@ -153,14 +149,26 @@ static int qoriq_tmu_register_tmu_zone(struct
> device *dev,
> >   			if (ret == -ENODEV)
> >   				continue;
> >
> > -			regmap_write(qdata->regmap, REGS_TMR,
> TMR_DISABLE);
> >   			return ret;
> >   		}
> >
> > +		if (qdata->ver == TMU_VER1)
> > +			sites |= 0x1 << (15 - id);
> > +		else
> > +			sites |= 0x1 << id;
> > +
> >   		if (devm_thermal_add_hwmon_sysfs(dev, tzd))
> >   			dev_warn(dev,
> >   				 "Failed to add hwmon sysfs attributes\n");
> > +	}
> >
> > +	if (sites) {
> > +		if (qdata->ver == TMU_VER1) {
> > +			regmap_write(qdata->regmap, REGS_TMR,
> TMR_ME | TMR_ALPF | sites);
> > +		} else {
> > +			regmap_write(qdata->regmap, REGS_V2_TMSR,
> sites);
> > +			regmap_write(qdata->regmap, REGS_TMR,
> TMR_ME | TMR_ALPF_V2);
> > +		}
> >   	}
> >
> >   	return 0;
> 
> --
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