linux-kernel - Re: [PATCH] ASoC: samsung: i2s: Supported high resolution rates

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Message-id: <595D8AEF.2090908@samsung.com>
Date:   Thu, 06 Jul 2017 09:57:19 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Jaechul Lee <jcsing.lee@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        alsa-devel <alsa-devel@...a-project.org>
Cc:     Jaechul Lee <galaxyra@...il.com>,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: samsung: i2s: Supported high resolution rates

Hi Jaechul,

On 2017년 07월 05일 14:58, Jaechul Lee wrote:
> This driver can support more frequencies over 96KHz. There are no reasons
> to limit the frequency range below 96KHz. If codecs/amps or something else
> can't support high resolution rates, the constraints would be set rates
> properly because each drivers have its own limits.
> 
> Signed-off-by: Jaechul Lee <jcsing.lee@...sung.com>
> ---
>  sound/soc/samsung/i2s.c | 19 +++++++++++++++----
>  1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
> index af3ba4d4ccc5..fc34af6a2c1e 100644
> --- a/sound/soc/samsung/i2s.c
> +++ b/sound/soc/samsung/i2s.c
> @@ -50,6 +50,7 @@ struct samsung_i2s_variant_regs {
>  
>  struct samsung_i2s_dai_data {
>  	u32 quirks;
> +	unsigned int rates;
>  	const struct samsung_i2s_variant_regs *i2s_variant_regs;
>  };
>  
> @@ -1076,20 +1077,25 @@ static const struct snd_soc_component_driver samsung_i2s_component = {
>  	.name		= "samsung-i2s",
>  };
>  
> -#define SAMSUNG_I2S_RATES	SNDRV_PCM_RATE_8000_96000
> -
>  #define SAMSUNG_I2S_FMTS	(SNDRV_PCM_FMTBIT_S8 | \
>  					SNDRV_PCM_FMTBIT_S16_LE | \
>  					SNDRV_PCM_FMTBIT_S24_LE)
>  
>  static struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
>  {
> +	const struct samsung_i2s_dai_data *i2s_dai_data;
>  	struct i2s_dai *i2s;
>  
>  	i2s = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dai), GFP_KERNEL);
>  	if (i2s == NULL)
>  		return NULL;
>  
> +	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
> +		i2s_dai_data = of_device_get_match_data(&pdev->dev);
> +	else
> +		i2s_dai_data = (struct samsung_i2s_dai_data *)
> +				platform_get_device_id(pdev)->driver_data;
> +

The samsung_i2s_probe() already gets the 'i2s_dai_data' instance.
It is not good to add the duplicate code in the i2s_alloc_dai().
You better to reuse the i2s_dai_data in samsung_i2s_probe()

I think that you can choose the following two method.
IMO, I prefer to use the 'method 1'.


method 1. Redefine the 'i2s_alloc_dai' function as following:
static struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec
				struct samsung_i2s_dai_data *i2s_dai_data)

method 2. Add the 'i2s_dai_data' field to the 'struct i2s_dai'.
@@ -98,6 +98,8 @@ struct i2s_dai {
        /* Below fields are only valid if this is the primary FIFO */
        struct clk *clk_table[3];
        struct clk_onecell_data clk_data;
+
+       struct samsung_i2s_dai_data *i2s_dai_data;
 };


>  	i2s->pdev = pdev;
>  	i2s->pri_dai = NULL;
>  	i2s->sec_dai = NULL;
> @@ -1101,13 +1107,13 @@ static struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
>  	i2s->i2s_dai_drv.resume = i2s_resume;
>  	i2s->i2s_dai_drv.playback.channels_min = 1;
>  	i2s->i2s_dai_drv.playback.channels_max = 2;
> -	i2s->i2s_dai_drv.playback.rates = SAMSUNG_I2S_RATES;
> +	i2s->i2s_dai_drv.playback.rates = i2s_dai_data->rates;
>  	i2s->i2s_dai_drv.playback.formats = SAMSUNG_I2S_FMTS;
>  
>  	if (!sec) {
>  		i2s->i2s_dai_drv.capture.channels_min = 1;
>  		i2s->i2s_dai_drv.capture.channels_max = 2;
> -		i2s->i2s_dai_drv.capture.rates = SAMSUNG_I2S_RATES;
> +		i2s->i2s_dai_drv.capture.rates = i2s_dai_data->rates;
>  		i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
>  	}
>  	return i2s;
> @@ -1452,29 +1458,34 @@ static const struct samsung_i2s_variant_regs i2sv5_i2s1_regs = {
>  
>  static const struct samsung_i2s_dai_data i2sv3_dai_type = {
>  	.quirks = QUIRK_NO_MUXPSR,
> +	.rates = SNDRV_PCM_RATE_8000_96000,
>  	.i2s_variant_regs = &i2sv3_regs,
>  };
>  
>  static const struct samsung_i2s_dai_data i2sv5_dai_type = {
>  	.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
>  			QUIRK_SUPPORTS_IDMA,
> +	.rates = SNDRV_PCM_RATE_8000_96000,
>  	.i2s_variant_regs = &i2sv3_regs,
>  };
>  
>  static const struct samsung_i2s_dai_data i2sv6_dai_type = {
>  	.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
>  			QUIRK_SUPPORTS_TDM | QUIRK_SUPPORTS_IDMA,
> +	.rates = SNDRV_PCM_RATE_8000_96000,
>  	.i2s_variant_regs = &i2sv6_regs,
>  };
>  
>  static const struct samsung_i2s_dai_data i2sv7_dai_type = {
>  	.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
>  			QUIRK_SUPPORTS_TDM,
> +	.rates = SNDRV_PCM_RATE_8000_192000,
>  	.i2s_variant_regs = &i2sv7_regs,
>  };
>  
>  static const struct samsung_i2s_dai_data i2sv5_dai_type_i2s1 = {
>  	.quirks = QUIRK_PRI_6CHAN | QUIRK_NEED_RSTCLR,
> +	.rates = SNDRV_PCM_RATE_8000_96000,
>  	.i2s_variant_regs = &i2sv5_i2s1_regs,
>  };
>  
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics