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

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Message-ID: <3c59c4e0-68eb-b778-6b12-9f9e331f81dd@linaro.org>
Date:   Wed, 31 May 2023 13:03:25 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, rafael@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     amitk@...nel.org, rui.zhang@...el.com, andrew.smirnov@...il.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-arm-kernel@...ts.infradead.org, alice.guo@....com,
        Peng Fan <peng.fan@....com>
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?

>   	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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