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Subject: Re: [PATCH v2 1/2] thermal: mediatek: prepare to add support for
 other platforms
To:     Henry Yen <henry.yen@mediatek.com>,
        Zhang Rui <rui.zhang@intel.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amit.kucheria@verdurent.com>
Cc:     linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        Steven Liu <steven.liu@mediatek.com>,
        Michael Kao <michael.kao@mediatek.com>
References: <1588238074-19338-1-git-send-email-henry.yen@mediatek.com>
 <1588238074-19338-2-git-send-email-henry.yen@mediatek.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Message-ID: <94d81c8a-2710-98a1-4cae-040e9b51fcd9@gmail.com>
Date:   Fri, 10 Jul 2020 17:19:01 +0200
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On 30/04/2020 11:14, Henry Yen wrote:
> It is known that Mediatek owns two thermal systems, which only differ
> in the way of reading calibration data and converting temperature.
> MT8173, MT8183, MT2701 and MT2712 belongs to version 1 thermal
> system, and MT7622 belongs to version 2.
> 
> In order to handle both systems, the suffix _V1 is appended to the
> current code, and then the second patch will add _V2 functions with
> the same purpose but different implementation.
> 
> Signed-off-by: Henry Yen <henry.yen@mediatek.com>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
>   drivers/thermal/mtk_thermal.c | 114 ++++++++++++++++++----------------
>   1 file changed, 62 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index 76e30603d4d5..10107d9d56a8 100644
> --- a/drivers/thermal/mtk_thermal.c
> +++ b/drivers/thermal/mtk_thermal.c
> @@ -120,18 +120,18 @@
>    * MT2701 has 3 sensors and needs 3 VTS calibration data.
>    * MT2712 has 4 sensors and needs 4 VTS calibration data.
>    */
> -#define CALIB_BUF0_VALID		BIT(0)
> -#define CALIB_BUF1_ADC_GE(x)		(((x) >> 22) & 0x3ff)
> -#define CALIB_BUF0_VTS_TS1(x)		(((x) >> 17) & 0x1ff)
> -#define CALIB_BUF0_VTS_TS2(x)		(((x) >> 8) & 0x1ff)
> -#define CALIB_BUF1_VTS_TS3(x)		(((x) >> 0) & 0x1ff)
> -#define CALIB_BUF2_VTS_TS4(x)		(((x) >> 23) & 0x1ff)
> -#define CALIB_BUF2_VTS_TS5(x)		(((x) >> 5) & 0x1ff)
> -#define CALIB_BUF2_VTS_TSABB(x)		(((x) >> 14) & 0x1ff)
> -#define CALIB_BUF0_DEGC_CALI(x)		(((x) >> 1) & 0x3f)
> -#define CALIB_BUF0_O_SLOPE(x)		(((x) >> 26) & 0x3f)
> -#define CALIB_BUF0_O_SLOPE_SIGN(x)	(((x) >> 7) & 0x1)
> -#define CALIB_BUF1_ID(x)		(((x) >> 9) & 0x1)
> +#define CALIB_BUF0_VALID_V1		BIT(0)
> +#define CALIB_BUF1_ADC_GE_V1(x)		(((x) >> 22) & 0x3ff)
> +#define CALIB_BUF0_VTS_TS1_V1(x)	(((x) >> 17) & 0x1ff)
> +#define CALIB_BUF0_VTS_TS2_V1(x)	(((x) >> 8) & 0x1ff)
> +#define CALIB_BUF1_VTS_TS3_V1(x)	(((x) >> 0) & 0x1ff)
> +#define CALIB_BUF2_VTS_TS4_V1(x)	(((x) >> 23) & 0x1ff)
> +#define CALIB_BUF2_VTS_TS5_V1(x)	(((x) >> 5) & 0x1ff)
> +#define CALIB_BUF2_VTS_TSABB_V1(x)	(((x) >> 14) & 0x1ff)
> +#define CALIB_BUF0_DEGC_CALI_V1(x)	(((x) >> 1) & 0x3f)
> +#define CALIB_BUF0_O_SLOPE_V1(x)	(((x) >> 26) & 0x3f)
> +#define CALIB_BUF0_O_SLOPE_SIGN_V1(x)	(((x) >> 7) & 0x1)
> +#define CALIB_BUF1_ID_V1(x)		(((x) >> 9) & 0x1)
>   
>   enum {
>   	VTS1,
> @@ -525,7 +525,7 @@ static const struct mtk_thermal_data mt8183_thermal_data = {
>    * This converts the raw ADC value to mcelsius using the SoC specific
>    * calibration constants
>    */
> -static int raw_to_mcelsius(struct mtk_thermal *mt, int sensno, s32 raw)
> +static int raw_to_mcelsius_v1(struct mtk_thermal *mt, int sensno, s32 raw)
>   {
>   	s32 tmp;
>   
> @@ -594,9 +594,9 @@ static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
>   		raw = readl(mt->thermal_base +
>   			    conf->msr[conf->bank_data[bank->id].sensors[i]]);
>   
> -		temp = raw_to_mcelsius(mt,
> -				       conf->bank_data[bank->id].sensors[i],
> -				       raw);
> +		temp = raw_to_mcelsius_v1(mt,
> +					  conf->bank_data[bank->id].sensors[i],
> +					  raw);
>   
>   		/*
>   		 * The first read of a sensor often contains very high bogus
> @@ -758,6 +758,51 @@ static u64 of_get_phys_base(struct device_node *np)
>   	return of_translate_address(np, regaddr_p);
>   }
>   
> +static int mtk_thermal_extract_efuse_v1(struct mtk_thermal *mt, u32 *buf)
> +{
> +	int i;
> +
> +	if (!(buf[0] & CALIB_BUF0_VALID_V1))
> +		return -EINVAL;
> +
> +	mt->adc_ge = CALIB_BUF1_ADC_GE_V1(buf[1]);
> +
> +	for (i = 0; i < mt->conf->num_sensors; i++) {
> +		switch (mt->conf->vts_index[i]) {
> +		case VTS1:
> +			mt->vts[VTS1] = CALIB_BUF0_VTS_TS1_V1(buf[0]);
> +			break;
> +		case VTS2:
> +			mt->vts[VTS2] = CALIB_BUF0_VTS_TS2_V1(buf[0]);
> +			break;
> +		case VTS3:
> +			mt->vts[VTS3] = CALIB_BUF1_VTS_TS3_V1(buf[1]);
> +			break;
> +		case VTS4:
> +			mt->vts[VTS4] = CALIB_BUF2_VTS_TS4_V1(buf[2]);
> +			break;
> +		case VTS5:
> +			mt->vts[VTS5] = CALIB_BUF2_VTS_TS5_V1(buf[2]);
> +			break;
> +		case VTSABB:
> +			mt->vts[VTSABB] =
> +				CALIB_BUF2_VTS_TSABB_V1(buf[2]);
> +			break;
> +		default:
> +			break;
> +		}
> +	}
> +
> +	mt->degc_cali = CALIB_BUF0_DEGC_CALI_V1(buf[0]);
> +	if (CALIB_BUF1_ID_V1(buf[1]) &
> +	    CALIB_BUF0_O_SLOPE_SIGN_V1(buf[0]))
> +		mt->o_slope = -CALIB_BUF0_O_SLOPE_V1(buf[0]);
> +	else
> +		mt->o_slope = CALIB_BUF0_O_SLOPE_V1(buf[0]);
> +
> +	return 0;
> +}
> +
>   static int mtk_thermal_get_calibration_data(struct device *dev,
>   					    struct mtk_thermal *mt)
>   {
> @@ -793,43 +838,8 @@ static int mtk_thermal_get_calibration_data(struct device *dev,
>   		goto out;
>   	}
>   
> -	if (buf[0] & CALIB_BUF0_VALID) {
> -		mt->adc_ge = CALIB_BUF1_ADC_GE(buf[1]);
> -
> -		for (i = 0; i < mt->conf->num_sensors; i++) {
> -			switch (mt->conf->vts_index[i]) {
> -			case VTS1:
> -				mt->vts[VTS1] = CALIB_BUF0_VTS_TS1(buf[0]);
> -				break;
> -			case VTS2:
> -				mt->vts[VTS2] = CALIB_BUF0_VTS_TS2(buf[0]);
> -				break;
> -			case VTS3:
> -				mt->vts[VTS3] = CALIB_BUF1_VTS_TS3(buf[1]);
> -				break;
> -			case VTS4:
> -				mt->vts[VTS4] = CALIB_BUF2_VTS_TS4(buf[2]);
> -				break;
> -			case VTS5:
> -				mt->vts[VTS5] = CALIB_BUF2_VTS_TS5(buf[2]);
> -				break;
> -			case VTSABB:
> -				mt->vts[VTSABB] = CALIB_BUF2_VTS_TSABB(buf[2]);
> -				break;
> -			default:
> -				break;
> -			}
> -		}
> -
> -		mt->degc_cali = CALIB_BUF0_DEGC_CALI(buf[0]);
> -		if (CALIB_BUF1_ID(buf[1]) &
> -		    CALIB_BUF0_O_SLOPE_SIGN(buf[0]))
> -			mt->o_slope = -CALIB_BUF0_O_SLOPE(buf[0]);
> -		else
> -			mt->o_slope = CALIB_BUF0_O_SLOPE(buf[0]);
> -	} else {
> +	if (mtk_thermal_extract_efuse_v1(mt, buf))
>   		dev_info(dev, "Device not calibrated, using default calibration values\n");
> -	}
>   
>   out:
>   	kfree(buf);
>