linux-kernel - Re: [PATCH 2/3] ASoC: fsl_sai: Add fsl_sai_check

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Message-ID: <20200917014949.GC22566@Asurada-Nvidia>
Date:   Wed, 16 Sep 2020 18:49:49 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     timur@...nel.org, Xiubo.Lee@...il.com, festevam@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, lgirdwood@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ASoC: fsl_sai: Add fsl_sai_check_version function

On Wed, Sep 16, 2020 at 06:16:26PM +0800, Shengjiu Wang wrote:
> fsl_sai_check_version can help to parse the version info
> in VERID and PARAM registers.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>

Acked-by: Nicolin Chen <nicoleotsuka@...il.com>

> ---
>  sound/soc/fsl/fsl_sai.c | 47 +++++++++++++++++++++++++++++++++++++++++
>  sound/soc/fsl/fsl_sai.h | 28 ++++++++++++++++++++++++
>  2 files changed, 75 insertions(+)
> 
> diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> index 24ca528ca2be..738b4dda7847 100644
> --- a/sound/soc/fsl/fsl_sai.c
> +++ b/sound/soc/fsl/fsl_sai.c
> @@ -946,6 +946,48 @@ static struct regmap_config fsl_sai_regmap_config = {
>  	.cache_type = REGCACHE_FLAT,
>  };
>  
> +static int fsl_sai_check_version(struct device *dev)
> +{
> +	struct fsl_sai *sai = dev_get_drvdata(dev);
> +	unsigned char ofs = sai->soc_data->reg_offset;
> +	unsigned int val;
> +	int ret;
> +
> +	if (FSL_SAI_TCSR(ofs) == FSL_SAI_VERID)
> +		return 0;
> +
> +	ret = regmap_read(sai->regmap, FSL_SAI_VERID, &val);
> +	if (ret < 0)
> +		return ret;
> +
> +	dev_dbg(dev, "VERID: 0x%016X\n", val);
> +
> +	sai->verid.major = (val & FSL_SAI_VERID_MAJOR_MASK) >>
> +			   FSL_SAI_VERID_MAJOR_SHIFT;
> +	sai->verid.minor = (val & FSL_SAI_VERID_MINOR_MASK) >>
> +			   FSL_SAI_VERID_MINOR_SHIFT;
> +	sai->verid.feature = val & FSL_SAI_VERID_FEATURE_MASK;
> +
> +	ret = regmap_read(sai->regmap, FSL_SAI_PARAM, &val);
> +	if (ret < 0)
> +		return ret;
> +
> +	dev_dbg(dev, "PARAM: 0x%016X\n", val);
> +
> +	/* Max slots per frame, power of 2 */
> +	sai->param.slot_num = 1 <<
> +		((val & FSL_SAI_PARAM_SPF_MASK) >> FSL_SAI_PARAM_SPF_SHIFT);
> +
> +	/* Words per fifo, power of 2 */
> +	sai->param.fifo_depth = 1 <<
> +		((val & FSL_SAI_PARAM_WPF_MASK) >> FSL_SAI_PARAM_WPF_SHIFT);
> +
> +	/* Number of datalines implemented */
> +	sai->param.dataline = val & FSL_SAI_PARAM_DLN_MASK;
> +
> +	return 0;
> +}
> +
>  static int fsl_sai_probe(struct platform_device *pdev)
>  {
>  	struct device_node *np = pdev->dev.of_node;
> @@ -1070,6 +1112,11 @@ static int fsl_sai_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, sai);
>  
> +	/* Get sai version */
> +	ret = fsl_sai_check_version(&pdev->dev);
> +	if (ret < 0)
> +		dev_warn(&pdev->dev, "Error reading SAI version: %d\n", ret);
> +
>  	pm_runtime_enable(&pdev->dev);
>  	regcache_cache_only(sai->regmap, true);
>  
> diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
> index d16fc4241f41..ba7425a9e217 100644
> --- a/sound/soc/fsl/fsl_sai.h
> +++ b/sound/soc/fsl/fsl_sai.h
> @@ -223,6 +223,32 @@ struct fsl_sai_soc_data {
>  	unsigned int reg_offset;
>  };
>  
> +/**
> + * struct fsl_sai_verid - version id data
> + * @major: major version number
> + * @minor: minor version number
> + * @feature: feature specification number
> + *           0000000000000000b - Standard feature set
> + *           0000000000000000b - Standard feature set
> + */
> +struct fsl_sai_verid {
> +	u32 major;
> +	u32 minor;
> +	u32 feature;
> +};
> +
> +/**
> + * struct fsl_sai_param - parameter data
> + * @slot_num: The maximum number of slots per frame
> + * @fifo_depth: The number of words in each FIFO (depth)
> + * @dataline: The number of datalines implemented
> + */
> +struct fsl_sai_param {
> +	u32 slot_num;
> +	u32 fifo_depth;
> +	u32 dataline;
> +};
> +
>  struct fsl_sai {
>  	struct platform_device *pdev;
>  	struct regmap *regmap;
> @@ -243,6 +269,8 @@ struct fsl_sai {
>  	const struct fsl_sai_soc_data *soc_data;
>  	struct snd_dmaengine_dai_dma_data dma_params_rx;
>  	struct snd_dmaengine_dai_dma_data dma_params_tx;
> +	struct fsl_sai_verid verid;
> +	struct fsl_sai_param param;
>  };
>  
>  #define TX 1
> -- 
> 2.27.0
>