linux-kernel - Re: [PATCH 02/13] ASoC: amd: acp: refactor acp i2s clock generation code

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Date:   Mon, 23 Oct 2023 09:37:00 +0200
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     Syed Saba Kareem <Syed.SabaKareem@....com>, broonie@...nel.org,
        alsa-devel@...a-project.org
Cc:     Vijendar.Mukunda@....com, Basavaraj.Hiregoudar@....com,
        Sunil-kumar.Dommati@....com, mario.limonciello@....com,
        venkataprasad.potturu@....com, arungopal.kondaveeti@....com,
        mastan.katragadda@....com, juan.martinez@....com,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        V Sujith Kumar Reddy <vsujithkumar.reddy@....com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/13] ASoC: amd: acp: refactor acp i2s clock generation
 code

On 10/21/2023 4:50 PM, Syed Saba Kareem wrote:
> Refactor acp i2s LRCLK,BCLK generation code and move to commnon file.
> 
> Signed-off-by: Syed Saba Kareem <Syed.SabaKareem@....com>
> ---
>   sound/soc/amd/acp/acp-i2s.c | 32 ++++++++++++++++++++++++++++++
>   sound/soc/amd/acp/amd.h     | 39 -------------------------------------
>   2 files changed, 32 insertions(+), 39 deletions(-)
> 
> diff --git a/sound/soc/amd/acp/acp-i2s.c b/sound/soc/amd/acp/acp-i2s.c
> index df350014966a..59d3a499771a 100644
> --- a/sound/soc/amd/acp/acp-i2s.c
> +++ b/sound/soc/amd/acp/acp-i2s.c
> @@ -20,10 +20,42 @@
>   #include <sound/soc.h>
>   #include <sound/soc-dai.h>
>   #include <linux/dma-mapping.h>
> +#include <linux/bitfield.h>
>   
>   #include "amd.h"
>   
>   #define DRV_NAME "acp_i2s_playcap"
> +#define	I2S_MASTER_MODE_ENABLE		1
> +#define	I2S_MODE_ENABLE			0
> +#define	I2S_FORMAT_MODE			GENMASK(1, 1)
> +#define	LRCLK_DIV_FIELD			GENMASK(10, 2)
> +#define	BCLK_DIV_FIELD			GENMASK(23, 11)
> +
> +static inline void acp_set_i2s_clk(struct acp_dev_data *adata, int dai_id)
> +{
> +	u32 i2s_clk_reg, val;
> +
> +	switch (dai_id) {
> +	case I2S_SP_INSTANCE:
> +		i2s_clk_reg = ACP_I2STDM0_MSTRCLKGEN;
> +		break;
> +	case I2S_BT_INSTANCE:
> +		i2s_clk_reg = ACP_I2STDM1_MSTRCLKGEN;
> +		break;
> +	case I2S_HS_INSTANCE:
> +		i2s_clk_reg = ACP_I2STDM2_MSTRCLKGEN;
> +		break;
> +	default:
> +		i2s_clk_reg = ACP_I2STDM0_MSTRCLKGEN;
> +		break;
> +	}
> +
> +	val  = I2S_MASTER_MODE_ENABLE;
> +	val |= I2S_MODE_ENABLE & BIT(1);

There is I2S_FORMAT_MODE define, you probably want to use it instead of 
BIT(1), so there is no "magic number" mask?

> +	val |= FIELD_PREP(LRCLK_DIV_FIELD, adata->lrclk_div);
> +	val |= FIELD_PREP(BCLK_DIV_FIELD, adata->bclk_div);
> +	writel(val, adata->acp_base + i2s_clk_reg);
> +}
>   
>   static int acp_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
>   			   unsigned int fmt)
> diff --git a/sound/soc/amd/acp/amd.h b/sound/soc/amd/acp/amd.h
> index 487eefa5985f..87d1e1f7d6b6 100644
> --- a/sound/soc/amd/acp/amd.h
> +++ b/sound/soc/amd/acp/amd.h
> @@ -188,17 +188,6 @@ struct acp_dev_data {
>   	u32 xfer_rx_resolution[3];
>   };
>   
> -union acp_i2stdm_mstrclkgen {
> -	struct {
> -		u32 i2stdm_master_mode : 1;
> -		u32 i2stdm_format_mode : 1;
> -		u32 i2stdm_lrclk_div_val : 9;
> -		u32 i2stdm_bclk_div_val : 11;
> -		u32:10;
> -	} bitfields, bits;
> -	u32  u32_all;
> -};
> -
>   extern const struct snd_soc_dai_ops asoc_acp_cpu_dai_ops;
>   extern const struct snd_soc_dai_ops acp_dmic_dai_ops;
>   
> @@ -276,32 +265,4 @@ static inline u64 acp_get_byte_count(struct acp_dev_data *adata, int dai_id, int
>   POINTER_RETURN_BYTES:
>   	return byte_count;
>   }
> -
> -static inline void acp_set_i2s_clk(struct acp_dev_data *adata, int dai_id)
> -{
> -	union acp_i2stdm_mstrclkgen mclkgen;
> -	u32 master_reg;
> -
> -	switch (dai_id) {
> -	case I2S_SP_INSTANCE:
> -		master_reg = ACP_I2STDM0_MSTRCLKGEN;
> -		break;
> -	case I2S_BT_INSTANCE:
> -		master_reg = ACP_I2STDM1_MSTRCLKGEN;
> -		break;
> -	case I2S_HS_INSTANCE:
> -		master_reg = ACP_I2STDM2_MSTRCLKGEN;
> -		break;
> -	default:
> -		master_reg = ACP_I2STDM0_MSTRCLKGEN;
> -		break;
> -	}
> -
> -	mclkgen.bits.i2stdm_master_mode = 0x1;
> -	mclkgen.bits.i2stdm_format_mode = 0x00;
> -
> -	mclkgen.bits.i2stdm_bclk_div_val = adata->bclk_div;
> -	mclkgen.bits.i2stdm_lrclk_div_val = adata->lrclk_div;
> -	writel(mclkgen.u32_all, adata->acp_base + master_reg);
> -}
>   #endif