linux-kernel - Re: [PATCH v4 07/16] ASoC: mediatek: mt8365: Add ADDA DAI support

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Date: Mon, 20 May 2024 12:27:18 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Alexandre Mergnat <amergnat@...libre.com>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Matthias Brugger
 <matthias.bgg@...il.com>, Lee Jones <lee@...nel.org>,
 Flora Fu <flora.fu@...iatek.com>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>
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-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v4 07/16] ASoC: mediatek: mt8365: Add ADDA DAI support

Il 26/04/24 19:22, Alexandre Mergnat ha scritto:
> Add ADDA Device Audio Interface support for MT8365 SoC.
> 
> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
> ---
>   sound/soc/mediatek/mt8365/mt8365-dai-adda.c | 315 ++++++++++++++++++++++++++++
>   1 file changed, 315 insertions(+)
> 
> diff --git a/sound/soc/mediatek/mt8365/mt8365-dai-adda.c b/sound/soc/mediatek/mt8365/mt8365-dai-adda.c
> new file mode 100644
> index 000000000000..65d45010ac90
> --- /dev/null
> +++ b/sound/soc/mediatek/mt8365/mt8365-dai-adda.c
> @@ -0,0 +1,315 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Mediatek 8365 ALSA SoC Audio DAI ADDA Control
> + *
> + * Copyright (c) 2024 MediaTek Inc.
> + * Authors: Jia Zeng <jia.zeng@...iatek.com>
> + *          Alexandre Mergnat <amergnat@...libre.com>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/regmap.h>
> +#include <sound/pcm_params.h>
> +#include "mt8365-afe-clk.h"
> +#include "mt8365-afe-common.h"
> +#include "../common/mtk-dai-adda-common.h"
> +
> +static int adda_afe_on_ref_cnt;
> +
> +/* DAI Drivers */
> +
> +static int mt8365_dai_set_adda_out(struct mtk_base_afe *afe, unsigned int rate)
> +{
> +	unsigned int val;
> +

if (rate == 8000 || rate == 16000)
	val = AFE_ADDA_DL_VOICE_DATA;
else
	val = 0;

> +	switch (rate) {
> +	case 8000:
> +		val = AFE_ADDA_DL_VOICE_DATA;
> +		break;
> +	case 16000:
> +		val = AFE_ADDA_DL_VOICE_DATA;
> +		break;
> +	default:
> +		val = 0;
> +	}
> +
> +	val |= FIELD_PREP(AFE_ADDA_DL_SAMPLING_RATE,
> +		mtk_adda_dl_rate_transform(afe, rate));
> +	val |= AFE_ADDA_DL_8X_UPSAMPLE |
> +	       AFE_ADDA_DL_MUTE_OFF_CH1 |
> +	       AFE_ADDA_DL_MUTE_OFF_CH2 |
> +	       AFE_ADDA_DL_DEGRADE_GAIN;
> +
> +	regmap_update_bits(afe->regmap, AFE_ADDA_PREDIS_CON0, 0xffffffff, 0);
> +	regmap_update_bits(afe->regmap, AFE_ADDA_PREDIS_CON1, 0xffffffff, 0);
> +	regmap_update_bits(afe->regmap, AFE_ADDA_DL_SRC2_CON0, 0xffffffff, val);
> +	/* SA suggest apply -0.3db to audio/speech path */
> +	regmap_update_bits(afe->regmap, AFE_ADDA_DL_SRC2_CON1,
> +			   0xffffffff, 0xf74f0000);
> +	/* SA suggest use default value for sdm */
> +	regmap_update_bits(afe->regmap, AFE_ADDA_DL_SDM_DCCOMP_CON,
> +			   0xffffffff, 0x0700701e);
> +
> +	return 0;
> +}
> +
> +static int mt8365_dai_set_adda_in(struct mtk_base_afe *afe, unsigned int rate)
> +{
> +	unsigned int val;
> +
> +	val = FIELD_PREP(AFE_ADDA_UL_SAMPLING_RATE,
> +			 mtk_adda_ul_rate_transform(afe, rate));
> +	regmap_update_bits(afe->regmap, AFE_ADDA_UL_SRC_CON0,
> +			   AFE_ADDA_UL_SAMPLING_RATE, val);
> +	/* Using Internal ADC */
> +	regmap_update_bits(afe->regmap, AFE_ADDA_TOP_CON0, 0x1, 0x0);
> +
> +	return 0;
> +}
> +
> +int mt8365_dai_enable_adda_on(struct mtk_base_afe *afe)
> +{
> +	unsigned long flags;
> +	struct mt8365_afe_private *afe_priv = afe->platform_priv;
> +
> +	spin_lock_irqsave(&afe_priv->afe_ctrl_lock, flags);
> +
> +	adda_afe_on_ref_cnt++;
> +	if (adda_afe_on_ref_cnt == 1)
> +		regmap_update_bits(afe->regmap, AFE_ADDA_UL_DL_CON0,
> +				   AFE_ADDA_UL_DL_ADDA_AFE_ON,
> +				   AFE_ADDA_UL_DL_ADDA_AFE_ON);
> +
> +	spin_unlock_irqrestore(&afe_priv->afe_ctrl_lock, flags);
> +
> +	return 0;
> +}
> +
> +int mt8365_dai_disable_adda_on(struct mtk_base_afe *afe)
> +{
> +	unsigned long flags;
> +	struct mt8365_afe_private *afe_priv = afe->platform_priv;
> +
> +	spin_lock_irqsave(&afe_priv->afe_ctrl_lock, flags);
> +
> +	adda_afe_on_ref_cnt--;
> +	if (adda_afe_on_ref_cnt == 0)
> +		regmap_update_bits(afe->regmap, AFE_ADDA_UL_DL_CON0,
> +				   AFE_ADDA_UL_DL_ADDA_AFE_ON,
> +				   ~AFE_ADDA_UL_DL_ADDA_AFE_ON);
> +	else if (adda_afe_on_ref_cnt < 0)
> +		adda_afe_on_ref_cnt = 0;

Should we dev_warn() here? The refcount should never be less than zero - if it is,
then there's some issue somewhere that must be solved.

> +
> +	spin_unlock_irqrestore(&afe_priv->afe_ctrl_lock, flags);
> +
> +	return 0;
> +}
> +

Cheers,
Angelo