linux-kernel - Re: [PATCH v2 1/3] regulator: s2mps11: Fix accidental enable of buck6 ramp delay

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Date:	Wed, 07 May 2014 11:48:25 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Axel Lin <axel.lin@...ics.com>,
	Sangbeom Kim <sbkim73@...sung.com>
Subject: Re: [PATCH v2 1/3] regulator: s2mps11: Fix accidental enable of buck6
 ramp delay

I forgot to CC the stable.

Mark, if the patches are OK and if you'll apply them, could you add a CC
stable to the commit msg?

Best regards,
Krzysztof


On wto, 2014-05-06 at 08:37 +0200, Krzysztof Kozlowski wrote:
> S2MPS11 supports enabling/disabling ramp delay only for buck[2346].
> Other bucks have ramp delay enabled always.
> 
> However the bit shift for enabling buck6 ramp delay in register is equal
> to 0. When ramp delay was set for the bucks unsupporting enable/disable
> (buck[15789] and buck10), the ramp delay for buck6 was also enabled.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Fixes: b96244fad953 ("regulator: s2mps11: Don't check enable_shift before setting enable ramp rate")
> ---
> 
> Changes since v2:
>  * Apply Axel Lin's suggestion (don't change the meaning
>    of enable_shift variable).
> 
> ---
>  drivers/regulator/s2mps11.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
> index e713c162fbd4..aaca37e1424f 100644
> --- a/drivers/regulator/s2mps11.c
> +++ b/drivers/regulator/s2mps11.c
> @@ -202,11 +202,16 @@ static int s2mps11_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
>  	if (!ramp_enable)
>  		goto ramp_disable;
>  
> -	ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
> -				 1 << enable_shift, 1 << enable_shift);
> -	if (ret) {
> -		dev_err(&rdev->dev, "failed to enable ramp rate\n");
> -		return ret;
> +	/* Ramp delay can be enabled/disabled only for buck[2346] */
> +	if ((rdev_get_id(rdev) >= S2MPS11_BUCK2 &&
> +			rdev_get_id(rdev) <= S2MPS11_BUCK4) ||
> +			rdev_get_id(rdev) == S2MPS11_BUCK6)  {
> +		ret = regmap_update_bits(rdev->regmap, S2MPS11_REG_RAMP,
> +					 1 << enable_shift, 1 << enable_shift);
> +		if (ret) {
> +			dev_err(&rdev->dev, "failed to enable ramp rate\n");
> +			return ret;
> +		}
>  	}
>  
>  	ramp_val = get_ramp_delay(ramp_delay);

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