linux-kernel - Re: [PATCH RFT] regulator: palmas: Fix calcuating selector in palmas_map_voltage

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Message-ID: <50052645.4090301@slimlogic.co.uk>
Date:	Tue, 17 Jul 2012 09:45:57 +0100
From:	Graeme Gregory <gg@...mlogic.co.uk>
To:	Axel Lin <axel.lin@...il.com>
CC:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...com>
Subject: Re: [PATCH RFT] regulator: palmas: Fix calcuating selector in palmas_map_voltage_smps

Good catch, thanks I totally forgot about the range bit in that function.

Acked-by: Graeme Gregory <gg@...mlogic.co.uk>

On 17/07/12 04:29, Axel Lin wrote:
> The logic of calculating selector in palmas_map_voltage_smps() does not match
> the logic to list voltage in palmas_list_voltage_smps().
>
> We use below equation to calculate voltage when selector > 0:
>         voltage = (0.49V + (selector * 0.01V)) * RANGE
> RANGE is either x1 or x2
>
> So we need to take into account with the multiplier set in VSEL register when
> calculating selector in palmas_map_voltage_smps()
>
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/regulator/palmas-regulator.c |   17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
> index 7540c95..17d19fb 100644
> --- a/drivers/regulator/palmas-regulator.c
> +++ b/drivers/regulator/palmas-regulator.c
> @@ -373,11 +373,22 @@ static int palmas_set_voltage_smps_sel(struct regulator_dev *dev,
>  static int palmas_map_voltage_smps(struct regulator_dev *rdev,
>  		int min_uV, int max_uV)
>  {
> +	struct palmas_pmic *pmic = rdev_get_drvdata(rdev);
> +	int id = rdev_get_id(rdev);
>  	int ret, voltage;
>  
> -	ret = ((min_uV - 500000) / 10000) + 1;
> -	if (ret < 0)
> -		return ret;
> +	if (min_uV == 0)
> +		return 0;
> +
> +	if (pmic->range[id]) { /* RANGE is x2 */
> +		if (min_uV < 1000000)
> +			min_uV = 1000000;
> +		ret = DIV_ROUND_UP(min_uV - 1000000, 20000) + 1;
> +	} else {		/* RANGE is x1 */
> +		if (min_uV < 500000)
> +			min_uV = 500000;
> +		ret = DIV_ROUND_UP(min_uV - 500000, 10000) + 1;
> +	}
>  
>  	/* Map back into a voltage to verify we're still in bounds */
>  	voltage = palmas_list_voltage_smps(rdev, ret);


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