linux-kernel - Re: [PATCH v2] thermal: qoriq: Update the settings for TMUv2

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Message-ID: <7fa1d7c2-e967-926b-772a-a2025a391aab@linaro.org>
Date:   Fri, 22 May 2020 18:44:39 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yuantian Tang <andy.tang@....com>, rui.zhang@...el.com,
        edubezval@...il.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] thermal: qoriq: Update the settings for TMUv2

On 16/04/2020 11:39, Yuantian Tang wrote:
> For TMU v2, TMSAR registers need to be set properly to get the
> accurate temperature values.
> Also temperature reading needs to convert to degree Celsius
> since it is in degrees Kelvin.

Please have a look at units.h for celsius <-> kelvin conversion

> Signed-off-by: Yuantian Tang <andy.tang@....com>
> ---
> v2:
> 	- change the temp in millicelsius
> 
>  drivers/thermal/qoriq_thermal.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/qoriq_thermal.c b/drivers/thermal/qoriq_thermal.c
> index 028a6bbf75dc..f6371127f707 100644
> --- a/drivers/thermal/qoriq_thermal.c
> +++ b/drivers/thermal/qoriq_thermal.c
> @@ -23,6 +23,7 @@
>  #define TMTMIR_DEFAULT	0x0000000f
>  #define TIER_DISABLE	0x0
>  #define TEUMR0_V2		0x51009c00
> +#define TMSARA_V2		0xe
>  #define TMU_VER1		0x1
>  #define TMU_VER2		0x2
>  
> @@ -50,6 +51,9 @@
>  					    * Site Register
>  					    */
>  #define TRITSR_V	BIT(31)
> +#define REGS_V2_TMSAR(n)	(0x304 + 16 * (n))	/* TMU monitoring
> +						* site adjustment register
> +						*/
>  #define REGS_TTRnCR(n)	(0xf10 + 4 * (n)) /* Temperature Range n
>  					   * Control Register
>  					   */
> @@ -100,7 +104,11 @@ static int tmu_get_temp(void *p, int *temp)
>  				     10 * USEC_PER_MSEC))
>  		return -ENODATA;
>  
> -	*temp = (val & 0xff) * 1000;
> +	/* For TMUv2, temperature reading in degrees Kelvin */
> +	if (qdata->ver == TMU_VER1)
> +		*temp = (val & 0xff) * 1000;
> +	else
> +		*temp = ((val & 0x1ff) - 273) * 1000;
>  
>  	return 0;
>  }
> @@ -192,6 +200,8 @@ static int qoriq_tmu_calibration(struct device *dev,
>  
>  static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
>  {
> +	int i;
> +
>  	/* Disable interrupt, using polling instead */
>  	regmap_write(data->regmap, REGS_TIER, TIER_DISABLE);
>  
> @@ -202,6 +212,8 @@ static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
>  	} else {
>  		regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT);
>  		regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2);
> +		for (i = 0; i < 7; i++)
> +			regmap_write(data->regmap, REGS_V2_TMSAR(i), TMSARA_V2);
>  	}
>  
>  	/* Disable monitoring */
> @@ -212,6 +224,7 @@ static const struct regmap_range qoriq_yes_ranges[] = {
>  	regmap_reg_range(REGS_TMR, REGS_TSCFGR),
>  	regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(3)),
>  	regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)),
> +	regmap_reg_range(REGS_V2_TMSAR(0), REGS_V2_TMSAR(15)),
>  	regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)),
>  	/* Read only registers below */
>  	regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)),
> 


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