linux-kernel - Re: [PATCH v4 01/10] ASoC: mediatek: common: modify mtk afe platform driver for mt8196

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Message-ID: <8e551fad9bd1627b9ed6f20be7d88bdc3438d482.camel@collabora.com>
Date: Wed, 11 Jun 2025 13:12:01 +0200
From: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
To: "Darren.Ye" <darren.ye@...iatek.com>, Liam Girdwood
 <lgirdwood@...il.com>,  Mark Brown <broonie@...nel.org>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,  Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno	 <angelogioacchino.delregno@...labora.com>,
 Jaroslav Kysela <perex@...ex.cz>,  Takashi Iwai <tiwai@...e.com>, Linus
 Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v4 01/10] ASoC: mediatek: common: modify mtk afe
 platform driver for mt8196

On Tue, 2025-06-10 at 17:27 +0800, Darren.Ye wrote:
> From: Darren Ye <darren.ye@...iatek.com>
> 
> Mofify the pcm pointer interface to support 64-bit address access.
> 
> Signed-off-by: Darren Ye <darren.ye@...iatek.com>
> ---
>  .../mediatek/common/mtk-afe-platform-driver.c | 47 ++++++++++++-----
> --
>  .../mediatek/common/mtk-afe-platform-driver.h |  2 +
>  2 files changed, 33 insertions(+), 16 deletions(-)
> 
> diff --git a/sound/soc/mediatek/common/mtk-afe-platform-driver.c
> b/sound/soc/mediatek/common/mtk-afe-platform-driver.c
> index 6b6330583941..a86594dca2b7 100644
> --- a/sound/soc/mediatek/common/mtk-afe-platform-driver.c
> +++ b/sound/soc/mediatek/common/mtk-afe-platform-driver.c
> @@ -86,29 +86,44 @@ snd_pcm_uframes_t mtk_afe_pcm_pointer(struct
> snd_soc_component *component,
>  	const struct mtk_base_memif_data *memif_data = memif->data;
>  	struct regmap *regmap = afe->regmap;
>  	struct device *dev = afe->dev;
> -	int reg_ofs_base = memif_data->reg_ofs_base;
> -	int reg_ofs_cur = memif_data->reg_ofs_cur;
> -	unsigned int hw_ptr = 0, hw_base = 0;
> -	int ret, pcm_ptr_bytes;
> -
> -	ret = regmap_read(regmap, reg_ofs_cur, &hw_ptr);
> -	if (ret || hw_ptr == 0) {
> -		dev_err(dev, "%s hw_ptr err\n", __func__);
> -		pcm_ptr_bytes = 0;
> +	unsigned int hw_ptr_lower32 = 0, hw_ptr_upper32 = 0;
> +	unsigned int hw_base_lower32 = 0, hw_base_upper32 = 0;
> +	unsigned long long hw_ptr = 0, hw_base = 0;
> +	int ret;
> +	unsigned long long pcm_ptr_bytes = 0;
> +
> +	ret = regmap_read(regmap, memif_data->reg_ofs_cur,
> &hw_ptr_lower32);
> +	if (ret || hw_ptr_lower32 == 0) {
> +		dev_err(dev, "%s hw_ptr_lower32 err\n", __func__);
>  		goto POINTER_RETURN_FRAMES;
>  	}
>  
> -	ret = regmap_read(regmap, reg_ofs_base, &hw_base);
> -	if (ret || hw_base == 0) {
> -		dev_err(dev, "%s hw_ptr err\n", __func__);
> -		pcm_ptr_bytes = 0;
> -		goto POINTER_RETURN_FRAMES;
> +	if (memif_data->reg_ofs_cur_msb) {
> +		ret = regmap_read(regmap, memif_data-
> >reg_ofs_cur_msb, &hw_ptr_upper32);
> +		if (ret) {
> +			dev_err(dev, "%s hw_ptr_upper32 err\n",
> __func__);
> +			goto POINTER_RETURN_FRAMES;
> +		}
>  	}
>  
> -	pcm_ptr_bytes = hw_ptr - hw_base;
> +	ret = regmap_read(regmap, memif_data->reg_ofs_base,
> &hw_base_lower32);
> +	if (ret || hw_base_lower32 == 0) {
> +		dev_err(dev, "%s hw_base_lower32 err\n", __func__);
> +		goto POINTER_RETURN_FRAMES;
> +	}
> +	if (memif_data->reg_ofs_base_msb) {
> +		ret = regmap_read(regmap, memif_data-
> >reg_ofs_base_msb, &hw_base_upper32);
> +		if (ret) {
> +			dev_err(dev, "%s hw_base_upper32 err\n",
> __func__);
> +			goto POINTER_RETURN_FRAMES;
> +		}
> +	}
> +	hw_ptr = ((unsigned long long)hw_ptr_upper32 << 32) +
> hw_ptr_lower32;
> +	hw_base = ((unsigned long long)hw_base_upper32 << 32) +
> hw_base_lower32;
>  
>  POINTER_RETURN_FRAMES:
> -	return bytes_to_frames(substream->runtime, pcm_ptr_bytes);
> +	pcm_ptr_bytes = MTK_WORD_SIZE_ALIGN(hw_ptr - hw_base);
> +	return bytes_to_frames(substream->runtime,
> (ssize_t)pcm_ptr_bytes);
>  }
>  EXPORT_SYMBOL_GPL(mtk_afe_pcm_pointer);
>  
> diff --git a/sound/soc/mediatek/common/mtk-afe-platform-driver.h
> b/sound/soc/mediatek/common/mtk-afe-platform-driver.h
> index fcc923b88f12..9809e60db511 100644
> --- a/sound/soc/mediatek/common/mtk-afe-platform-driver.h
> +++ b/sound/soc/mediatek/common/mtk-afe-platform-driver.h
> @@ -12,6 +12,8 @@
>  #define AFE_PCM_NAME "mtk-afe-pcm"
>  extern const struct snd_soc_component_driver mtk_afe_pcm_platform;
>  
> +#define MTK_WORD_SIZE_ALIGN(x) ((x) & (0xfffffffff0))
> +
>  struct mtk_base_afe;
>  struct snd_pcm;
>  struct snd_soc_component;

Tested-by: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com> # on
Mediatek Genio 510 EVK and Genio 1200 EVK