linux-kernel - Re: [PATCH 2/2] asoc: soc-core: use regmap's parse

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Date:	Wed, 19 Feb 2014 13:28:54 +0800
From:	Nenghua Cao <nhcao@...vell.com>
To:	Nenghua Cao <nhcao@...vell.com>
CC:	Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] asoc: soc-core: use regmap's parse_val to do endian
 translation

Update Liam and Mark's mail.

On 02/19/2014 01:20 PM, Nenghua Cao wrote:
> From: Nenghua Cao <nhcao@...vell.com>
> 
>     In snd_soc_bytes_put function, it forces cpu to do cpu_to_be translation,
> but for mmio bus which uses REGMAP_ENDIAN_NATIVE, it doesn't need to do
> endian translation. So it is better to use regmap's api which can decide
> if this translation is needed according to bus configuration.
> 
> Signed-off-by: Nenghua Cao <nhcao@...vell.com>
> ---
>  sound/soc/soc-core.c |   34 +++++++++++++++++++++++++++++-----
>  1 files changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> index fe1df50..fb598cb 100644
> --- a/sound/soc/soc-core.c
> +++ b/sound/soc/soc-core.c
> @@ -3234,7 +3234,7 @@ int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
>  	struct soc_bytes *params = (void *)kcontrol->private_value;
>  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
>  	int ret, len;
> -	unsigned int val;
> +	unsigned int val, mask;
>  	void *data;
>  
>  	if (!codec->using_regmap)
> @@ -3264,12 +3264,36 @@ int snd_soc_bytes_put(struct snd_kcontrol *kcontrol,
>  			((u8 *)data)[0] |= val;
>  			break;
>  		case 2:
> -			((u16 *)data)[0] &= cpu_to_be16(~params->mask);
> -			((u16 *)data)[0] |= cpu_to_be16(val);
> +			mask = ~params->mask;
> +			ret = regmap_parse_val(codec->control_data,
> +							&mask, &mask);
> +			if (ret != 0)
> +				goto out;
> +
> +			((u16 *)data)[0] &= mask;
> +
> +			ret = regmap_parse_val(codec->control_data,
> +							&val, &val);
> +			if (ret != 0)
> +				goto out;
> +
> +			((u16 *)data)[0] |= val;
>  			break;
>  		case 4:
> -			((u32 *)data)[0] &= cpu_to_be32(~params->mask);
> -			((u32 *)data)[0] |= cpu_to_be32(val);
> +			mask = ~params->mask;
> +			ret = regmap_parse_val(codec->control_data,
> +							&mask, &mask);
> +			if (ret != 0)
> +				goto out;
> +
> +			((u32 *)data)[0] &= mask;
> +
> +			ret = regmap_parse_val(codec->control_data,
> +							&val, &val);
> +			if (ret != 0)
> +				goto out;
> +
> +			((u32 *)data)[0] |= val;
>  			break;
>  		default:
>  			ret = -EINVAL;
> 

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