linux-kernel - Re: [PATCH] mfd:adp5520: Restore mode bits on resume

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Message-ID: <512379AC.6010304@analog.com>
Date:	Tue, 19 Feb 2013 14:10:04 +0100
From:	Michael Hennerich <michael.hennerich@...log.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	Samuel Ortiz <sameo@...ux.intel.com>,
	"device-drivers-devel@...ckfin.uclinux.org" 
	<device-drivers-devel@...ckfin.uclinux.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd:adp5520: Restore mode bits on resume

On 02/19/2013 11:51 AM, Lars-Peter Clausen wrote:
> The adp5520 unfortunately also clears the BL_EN bit when the nSTNDBY bit is
> cleared. So we need to make sure to restore it during resume if it was set
> before suspend.
>
> Cc: stable@...r.kernel.org
> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Acked-by: Michael Hennerich <michael.hennerich@...log.com>
> ---
>   drivers/mfd/adp5520.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mfd/adp5520.c b/drivers/mfd/adp5520.c
> index 210dd03..6b40e0c 100644
> --- a/drivers/mfd/adp5520.c
> +++ b/drivers/mfd/adp5520.c
> @@ -36,6 +36,7 @@ struct adp5520_chip {
>   	struct blocking_notifier_head notifier_list;
>   	int irq;
>   	unsigned long id;
> +	uint8_t mode;
>   };
>   
>   static int __adp5520_read(struct i2c_client *client,
> @@ -326,7 +327,10 @@ static int adp5520_suspend(struct device *dev)
>   	struct i2c_client *client = to_i2c_client(dev);
>   	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
>   
> -	adp5520_clr_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
> +	adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
> +	/* All other bits are W1C */
> +	chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
> +	adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
>   	return 0;
>   }
>   
> @@ -335,7 +339,7 @@ static int adp5520_resume(struct device *dev)
>   	struct i2c_client *client = to_i2c_client(dev);
>   	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
>   
> -	adp5520_set_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
> +	adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
>   	return 0;
>   }
>   #endif


-- 
Greetings,
Michael

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