linux-kernel - Re: [PATCH 1/1] regulator: max77802: set opmode to normal if off is read from hw

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Date:	Wed, 27 Aug 2014 12:17:31 +0530
From:	Yuvaraj Kumar <yuvaraj.cd@...il.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Mark Brown <broonie@...nel.org>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] regulator: max77802: set opmode to normal if off is
 read from hw

Tested-by: Yuvaraj Kumar CD <yuvaraj.cd@...sung.com>

On Tue, Aug 26, 2014 at 5:07 PM, Javier Martinez Canillas
<javier.martinez@...labora.co.uk> wrote:
> The max77802 driver reads the default operating mode (opmode)
> set for regulators when enabled from the hardware registers.
>
> But if a regulator is disabled and the system warm restarted,
> the hardware reports OFF as the opmode so the regulator is
> not enabled. Default to operating mode NORMAL if OFF is read
> from the hardware register.
>
> Reported-by: Yuvaraj Cd <yuvaraj.lkml@...il.com>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> ---
>
> This patch fixes the issue reported in https://lkml.org/lkml/2014/8/25/69
>
>  drivers/regulator/max77802.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
> index ad1caa9..967e109 100644
> --- a/drivers/regulator/max77802.c
> +++ b/drivers/regulator/max77802.c
> @@ -540,7 +540,17 @@ static int max77802_pmic_probe(struct platform_device *pdev)
>                 config.of_node = pdata->regulators[i].of_node;
>
>                 ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
> -               max77802->opmode[id] = val >> shift & MAX77802_OPMODE_MASK;
> +               val = val >> shift & MAX77802_OPMODE_MASK;
> +
> +               /*
> +                * If the regulator is disabled and the system warm rebooted,
> +                * the hardware reports OFF as the regulator operating mode.
> +                * Default to operating mode NORMAL in that case.
> +                */
> +               if (val == MAX77802_OPMODE_OFF)
> +                       max77802->opmode[id] = MAX77802_OPMODE_NORMAL;
> +               else
> +                       max77802->opmode[id] = val;
>
>                 rdev = devm_regulator_register(&pdev->dev,
>                                                &regulators[i], &config);
> --
> 2.0.1
>
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