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Date:   Thu, 28 Sep 2023 00:55:33 +0100
From:   Daniel Golle <daniel@makrotopia.org>
To:     Frank Wunderlich <linux@fw-web.de>
Cc:     linux-mediatek@lists.infradead.org,
        Frank Wunderlich <frank-w@public-files.de>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amitk@kernel.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        linux-pm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 3/4] thermal/drivers/mediatek/lvts_thermal: make coeff
 configurable
Message-ID: <ZRTA9UtVm9zxf2QD@pidgin.makrotopia.org>
References: <20230922055020.6436-1-linux@fw-web.de>
 <20230922055020.6436-4-linux@fw-web.de>
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On Fri, Sep 22, 2023 at 07:50:19AM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@public-files.de>
> 
> The upcoming mt7988 has different temperature coefficients so we
> cannot use constants in the functions lvts_golden_temp_init,
> lvts_golden_temp_init and lvts_raw_to_temp anymore.
> 
> Add a field in the lvts_ctrl pointing to the lvts_data which now
> contains the soc-specific temperature coefficents.
> 
> To make the code better readable, rename static int coeff_b to
> golden_temp_offset, COEFF_A to temp_factor and COEFF_B to temp_offset.
> 
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Tested-by: Daniel Golle <daniel@makrotopia.org>

> ---
> v2:
> - rename static int coeff_b to golden_temp_offset
> - rename coeff.a to temp_factor and coeff.b to temp_offset
> ---
>  drivers/thermal/mediatek/lvts_thermal.c | 51 ++++++++++++++++---------
>  1 file changed, 34 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
> index effd9b00a424..c2669f405a94 100644
> --- a/drivers/thermal/mediatek/lvts_thermal.c
> +++ b/drivers/thermal/mediatek/lvts_thermal.c
> @@ -80,8 +80,8 @@
>  #define LVTS_SENSOR_MAX				4
>  #define LVTS_GOLDEN_TEMP_MAX		62
>  #define LVTS_GOLDEN_TEMP_DEFAULT	50
> -#define LVTS_COEFF_A				-250460
> -#define LVTS_COEFF_B				250460
> +#define LVTS_COEFF_A_MT8195			-250460
> +#define LVTS_COEFF_B_MT8195			250460
>  
>  #define LVTS_MSR_IMMEDIATE_MODE		0
>  #define LVTS_MSR_FILTERED_MODE		1
> @@ -94,7 +94,7 @@
>  #define LVTS_MINIMUM_THRESHOLD		20000
>  
>  static int golden_temp = LVTS_GOLDEN_TEMP_DEFAULT;
> -static int coeff_b = LVTS_COEFF_B;
> +static int golden_temp_offset;
>  
>  struct lvts_sensor_data {
>  	int dt_id;
> @@ -112,6 +112,8 @@ struct lvts_ctrl_data {
>  struct lvts_data {
>  	const struct lvts_ctrl_data *lvts_ctrl;
>  	int num_lvts_ctrl;
> +	int temp_factor;
> +	int temp_offset;
>  };
>  
>  struct lvts_sensor {
> @@ -126,6 +128,7 @@ struct lvts_sensor {
>  
>  struct lvts_ctrl {
>  	struct lvts_sensor sensors[LVTS_SENSOR_MAX];
> +	const struct lvts_data *lvts_data;
>  	u32 calibration[LVTS_SENSOR_MAX];
>  	u32 hw_tshut_raw_temp;
>  	int num_lvts_sensor;
> @@ -247,21 +250,21 @@ static void lvts_debugfs_exit(struct lvts_domain *lvts_td) { }
>  
>  #endif
>  
> -static int lvts_raw_to_temp(u32 raw_temp)
> +static int lvts_raw_to_temp(u32 raw_temp, int temp_factor)
>  {
>  	int temperature;
>  
> -	temperature = ((s64)(raw_temp & 0xFFFF) * LVTS_COEFF_A) >> 14;
> -	temperature += coeff_b;
> +	temperature = ((s64)(raw_temp & 0xFFFF) * temp_factor) >> 14;
> +	temperature += golden_temp_offset;
>  
>  	return temperature;
>  }
>  
> -static u32 lvts_temp_to_raw(int temperature)
> +static u32 lvts_temp_to_raw(int temperature, int temp_factor)
>  {
> -	u32 raw_temp = ((s64)(coeff_b - temperature)) << 14;
> +	u32 raw_temp = ((s64)(golden_temp_offset - temperature)) << 14;
>  
> -	raw_temp = div_s64(raw_temp, -LVTS_COEFF_A);
> +	raw_temp = div_s64(raw_temp, -temp_factor);
>  
>  	return raw_temp;
>  }
> @@ -269,6 +272,9 @@ static u32 lvts_temp_to_raw(int temperature)
>  static int lvts_get_temp(struct thermal_zone_device *tz, int *temp)
>  {
>  	struct lvts_sensor *lvts_sensor = thermal_zone_device_priv(tz);
> +	struct lvts_ctrl *lvts_ctrl = container_of(lvts_sensor, struct lvts_ctrl,
> +						   sensors[lvts_sensor->id]);
> +	const struct lvts_data *lvts_data = lvts_ctrl->lvts_data;
>  	void __iomem *msr = lvts_sensor->msr;
>  	u32 value;
>  	int rc;
> @@ -301,7 +307,7 @@ static int lvts_get_temp(struct thermal_zone_device *tz, int *temp)
>  	if (rc)
>  		return -EAGAIN;
>  
> -	*temp = lvts_raw_to_temp(value & 0xFFFF);
> +	*temp = lvts_raw_to_temp(value & 0xFFFF, lvts_data->temp_factor);
>  
>  	return 0;
>  }
> @@ -348,10 +354,13 @@ static bool lvts_should_update_thresh(struct lvts_ctrl *lvts_ctrl, int high)
>  static int lvts_set_trips(struct thermal_zone_device *tz, int low, int high)
>  {
>  	struct lvts_sensor *lvts_sensor = thermal_zone_device_priv(tz);
> -	struct lvts_ctrl *lvts_ctrl = container_of(lvts_sensor, struct lvts_ctrl, sensors[lvts_sensor->id]);
> +	struct lvts_ctrl *lvts_ctrl = container_of(lvts_sensor, struct lvts_ctrl,
> +						   sensors[lvts_sensor->id]);
> +	const struct lvts_data *lvts_data = lvts_ctrl->lvts_data;
>  	void __iomem *base = lvts_sensor->base;
> -	u32 raw_low = lvts_temp_to_raw(low != -INT_MAX ? low : LVTS_MINIMUM_THRESHOLD);
> -	u32 raw_high = lvts_temp_to_raw(high);
> +	u32 raw_low = lvts_temp_to_raw(low != -INT_MAX ? low : LVTS_MINIMUM_THRESHOLD,
> +				       lvts_data->temp_factor);
> +	u32 raw_high = lvts_temp_to_raw(high, lvts_data->temp_factor);
>  	bool should_update_thresh;
>  
>  	lvts_sensor->low_thresh = low;
> @@ -692,7 +701,7 @@ static int lvts_calibration_read(struct device *dev, struct lvts_domain *lvts_td
>  	return 0;
>  }
>  
> -static int lvts_golden_temp_init(struct device *dev, u32 *value)
> +static int lvts_golden_temp_init(struct device *dev, u32 *value, int temp_offset)
>  {
>  	u32 gt;
>  
> @@ -701,7 +710,7 @@ static int lvts_golden_temp_init(struct device *dev, u32 *value)
>  	if (gt && gt < LVTS_GOLDEN_TEMP_MAX)
>  		golden_temp = gt;
>  
> -	coeff_b = golden_temp * 500 + LVTS_COEFF_B;
> +	golden_temp_offset = golden_temp * 500 + temp_offset;
>  
>  	return 0;
>  }
> @@ -724,7 +733,7 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
>  	 * The golden temp information is contained in the first chunk
>  	 * of efuse data.
>  	 */
> -	ret = lvts_golden_temp_init(dev, (u32 *)lvts_td->calib);
> +	ret = lvts_golden_temp_init(dev, (u32 *)lvts_td->calib, lvts_data->temp_offset);
>  	if (ret)
>  		return ret;
>  
> @@ -735,6 +744,7 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
>  	for (i = 0; i < lvts_data->num_lvts_ctrl; i++) {
>  
>  		lvts_ctrl[i].base = lvts_td->base + lvts_data->lvts_ctrl[i].offset;
> +		lvts_ctrl[i].lvts_data = lvts_data;
>  
>  		ret = lvts_sensor_init(dev, &lvts_ctrl[i],
>  				       &lvts_data->lvts_ctrl[i]);
> @@ -758,7 +768,8 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
>  		 * after initializing the calibration.
>  		 */
>  		lvts_ctrl[i].hw_tshut_raw_temp =
> -			lvts_temp_to_raw(lvts_data->lvts_ctrl[i].hw_tshut_temp);
> +			lvts_temp_to_raw(lvts_data->lvts_ctrl[i].hw_tshut_temp,
> +					 lvts_data->temp_factor);
>  
>  		lvts_ctrl[i].low_thresh = INT_MIN;
>  		lvts_ctrl[i].high_thresh = INT_MIN;
> @@ -1223,6 +1234,8 @@ static int lvts_probe(struct platform_device *pdev)
>  	if (irq < 0)
>  		return irq;
>  
> +	golden_temp_offset = lvts_data->temp_offset;
> +
>  	ret = lvts_domain_init(dev, lvts_td, lvts_data);
>  	if (ret)
>  		return dev_err_probe(dev, ret, "Failed to initialize the lvts domain\n");
> @@ -1338,11 +1351,15 @@ static const struct lvts_ctrl_data mt8195_lvts_ap_data_ctrl[] = {
>  static const struct lvts_data mt8195_lvts_mcu_data = {
>  	.lvts_ctrl	= mt8195_lvts_mcu_data_ctrl,
>  	.num_lvts_ctrl	= ARRAY_SIZE(mt8195_lvts_mcu_data_ctrl),
> +	.temp_factor	= LVTS_COEFF_A_MT8195,
> +	.temp_offset	= LVTS_COEFF_B_MT8195,
>  };
>  
>  static const struct lvts_data mt8195_lvts_ap_data = {
>  	.lvts_ctrl	= mt8195_lvts_ap_data_ctrl,
>  	.num_lvts_ctrl	= ARRAY_SIZE(mt8195_lvts_ap_data_ctrl),
> +	.temp_factor	= LVTS_COEFF_A_MT8195,
> +	.temp_offset	= LVTS_COEFF_B_MT8195,
>  };
>  
>  static const struct of_device_id lvts_of_match[] = {
> -- 
> 2.34.1
>