linux-kernel - Re: [PATCH 2/4] power: supply: max17042_battery: use ModelCfg refresh on max17055

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Date:   Fri, 18 Mar 2022 10:04:13 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org
Cc:     Purism Kernel Team <kernel@...i.sm>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/4] power: supply: max17042_battery: use ModelCfg refresh
 on max17055

Hi,

On 3/18/22 01:10, Sebastian Krzyszkowiak wrote:
> Unlike other models, max17055 doesn't require cell characterization
> data and operates on smaller amount of input variables (DesignCap,
> VEmpty, IChgTerm and ModelCfg). Input data can already be filled in
> by max17042_override_por_values, however model refresh bit has to be
> set after adjusting input variables in order to make them apply.
> 
> Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
> ---
>  drivers/power/supply/max17042_battery.c | 73 +++++++++++++++----------
>  include/linux/power/max17042_battery.h  |  3 +
>  2 files changed, 48 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
> index c019d6c52363..c39250349a1d 100644
> --- a/drivers/power/supply/max17042_battery.c
> +++ b/drivers/power/supply/max17042_battery.c
> @@ -806,6 +806,13 @@ static inline void max17042_override_por_values(struct max17042_chip *chip)
>  	    (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055)) {
>  		max17042_override_por(map, MAX17047_V_empty, config->vempty);
>  	}
> +
> +	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055) {
> +		max17042_override_por(map, MAX17055_ModelCfg, config->model_cfg);
> +		// VChg is 1 by default, so allow it to be set to 0
> +		regmap_update_bits(map, MAX17055_ModelCfg,
> +				MAX17055_MODELCFG_VCHG_BIT, config->model_cfg);
> +	}
>  }
>  
>  static int max17042_init_chip(struct max17042_chip *chip)
> @@ -814,44 +821,54 @@ static int max17042_init_chip(struct max17042_chip *chip)
>  	int ret;
>  
>  	max17042_override_por_values(chip);
> +
> +	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055) {
> +		regmap_write_bits(map, MAX17055_ModelCfg,
> +				  MAX17055_MODELCFG_REFRESH_BIT, MAX17055_MODELCFG_REFRESH_BIT);
> +	}
> +

This can be folded into the if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17055) {}
which you add to max17042_override_por_values() above.


>  	/* After Power up, the MAX17042 requires 500mS in order
>  	 * to perform signal debouncing and initial SOC reporting
>  	 */
>  	msleep(500);
>  
> -	/* Initialize configuration */
> -	max17042_write_config_regs(chip);
> -
> -	/* write cell characterization data */
> -	ret = max17042_init_model(chip);
> -	if (ret) {
> -		dev_err(&chip->client->dev, "%s init failed\n",
> -			__func__);
> -		return -EIO;
> -	}
> +	if ((chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) ||
> +	    (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047) ||
> +	    (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)) {
> +		/* Initialize configuration */
> +		max17042_write_config_regs(chip);
> +
> +		/* write cell characterization data */
> +		ret = max17042_init_model(chip);
> +		if (ret) {
> +			dev_err(&chip->client->dev, "%s init failed\n",
> +				__func__);
> +			return -EIO;
> +		}
>  
> -	ret = max17042_verify_model_lock(chip);
> -	if (ret) {
> -		dev_err(&chip->client->dev, "%s lock verify failed\n",
> -			__func__);
> -		return -EIO;
> -	}
> -	/* write custom parameters */
> -	max17042_write_custom_regs(chip);
> +		ret = max17042_verify_model_lock(chip);
> +		if (ret) {
> +			dev_err(&chip->client->dev, "%s lock verify failed\n",
> +				__func__);
> +			return -EIO;
> +		}
> +		/* write custom parameters */
> +		max17042_write_custom_regs(chip);
>  
> -	/* update capacity params */
> -	max17042_update_capacity_regs(chip);
> +		/* update capacity params */
> +		max17042_update_capacity_regs(chip);
>  
> -	/* delay must be atleast 350mS to allow VFSOC
> -	 * to be calculated from the new configuration
> -	 */
> -	msleep(350);
> +		/* delay must be at least 350mS to allow VFSOC
> +		 * to be calculated from the new configuration
> +		 */
> +		msleep(350);
>  
> -	/* reset vfsoc0 reg */
> -	max17042_reset_vfsoc0_reg(chip);
> +		/* reset vfsoc0 reg */
> +		max17042_reset_vfsoc0_reg(chip);
>  
> -	/* load new capacity params */
> -	max17042_load_new_capacity_params(chip);
> +		/* load new capacity params */
> +		max17042_load_new_capacity_params(chip);
> +	}
>  
>  	/* Init complete, Clear the POR bit */
>  	regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
> diff --git a/include/linux/power/max17042_battery.h b/include/linux/power/max17042_battery.h
> index c417abd2ab70..6943921cab5e 100644
> --- a/include/linux/power/max17042_battery.h
> +++ b/include/linux/power/max17042_battery.h
> @@ -23,6 +23,8 @@
>  
>  #define MAX17042_CHARACTERIZATION_DATA_SIZE 48
>  
> +#define MAX17055_MODELCFG_REFRESH_BIT	BIT(15)
> +
>  enum max17042_register {
>  	MAX17042_STATUS		= 0x00,
>  	MAX17042_VALRT_Th	= 0x01,
> @@ -208,6 +210,7 @@ struct max17042_config_data {
>  	u16	full_soc_thresh;	/* 0x13 */
>  	u16	design_cap;	/* 0x18 */
>  	u16	ichgt_term;	/* 0x1E */
> +	u16	model_cfg;	/* 0xDB */
>  
>  	/* MG3 config */
>  	u16	at_rate;	/* 0x04 */

Regards,

Hans