Re: [PATCH v4 05/13] ASoC: mediatek: mt8188: support etdm in platform driver

["Trevor Wu (吳文良)" <Trevor.Wu@mediatek.com>]

On Mon, 2023-01-02 at 15:04 +0100, AngeloGioacchino Del Regno wrote:
> Il 30/12/22 06:54, Trevor Wu ha scritto:
> > Add mt8188 etdm dai driver support.
> > 
> > Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
> > ---
> >   sound/soc/mediatek/mt8188/mt8188-dai-etdm.c | 2591
> > +++++++++++++++++++
> >   1 file changed, 2591 insertions(+)
> >   create mode 100644 sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > 
> > diff --git a/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > new file mode 100644
> > index 000000000000..f8e69d655706
> > --- /dev/null
> > +++ b/sound/soc/mediatek/mt8188/mt8188-dai-etdm.c
> > @@ -0,0 +1,2591 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * MediaTek ALSA SoC Audio DAI eTDM Control
> > + *
> > + * Copyright (c) 2022 MediaTek Inc.
> > + * Author: Bicycle Tsai <bicycle.tsai@mediatek.com>
> > + *         Trevor Wu <trevor.wu@mediatek.com>
> > + *         Chun-Chia Chiu <chun-chia.chiu@mediatek.com>
> > + */
> > +
> 
> ..snip..
> 
> > +
> > +static int mtk_dai_etdm_get_clkdiv_id_by_dai_id(int dai_id)
> > +{
> > +	int clk_id = -1;
> > +
> > +	switch (dai_id) {
> > +	case MT8188_AFE_IO_DPTX:
> > +		clk_id = MT8188_CLK_TOP_APLL12_DIV9;
> 
> 		return MT8188_CLK_TOP_APLL12_DIV_9;
> 
> > +		break;
> > +	case MT8188_AFE_IO_ETDM1_IN:
> > +		clk_id = MT8188_CLK_TOP_APLL12_DIV0;
> 
> 		return MT8188_CLK_TOP_APLL12_DIV0;
> 
> > +		break;
> > +	case MT8188_AFE_IO_ETDM2_IN:
> > +		clk_id = MT8188_CLK_TOP_APLL12_DIV1;
> 
> return .....
> 
> > +		break;
> > +	case MT8188_AFE_IO_ETDM1_OUT:
> > +		clk_id = MT8188_CLK_TOP_APLL12_DIV2;
> > +		break;
> > +	case MT8188_AFE_IO_ETDM2_OUT:
> > +		clk_id = MT8188_CLK_TOP_APLL12_DIV3;
> > +		break;
> > +	case MT8188_AFE_IO_ETDM3_OUT:
> > +	default:
> > +		break;
> > +	}
> > +
> > +	return clk_id;
> 
> 	return -EINVAL;
> 
> ...so you don't need clk_id at all :-)
> 
> > +}
> > +
> 
> ..snip..
> 
> > +
> > +static int mtk_dai_etdm_mclk_configure(struct mtk_base_afe *afe,
> > int dai_id)
> > +{
> > +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> > +	struct mtk_dai_etdm_priv *etdm_data;
> > +	int clk_id = mtk_dai_etdm_get_clk_id_by_dai_id(dai_id);
> > +	int clkdiv_id = mtk_dai_etdm_get_clkdiv_id_by_dai_id(dai_id);
> > +	int apll;
> > +	int apll_clk_id;
> > +	struct etdm_con_reg etdm_reg;
> > +	int ret = 0;
> > +
> > +	if (clk_id < 0 || clkdiv_id < 0)
> > +		return 0;
> > +
> > +	if (!is_valid_etdm_dai(dai_id))
> > +		return -EINVAL;
> > +	etdm_data = afe_priv->dai_priv[dai_id];
> > +
> > +	ret = get_etdm_reg(dai_id, &etdm_reg);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	if (etdm_data->mclk_dir == SND_SOC_CLOCK_OUT)
> > +		regmap_set_bits(afe->regmap, etdm_reg.con1,
> > +				ETDM_CON1_MCLK_OUTPUT);
> > +	else
> > +		regmap_clear_bits(afe->regmap, etdm_reg.con1,
> > +				  ETDM_CON1_MCLK_OUTPUT);
> > +
> > +	if (etdm_data->mclk_freq) {
> > +		apll = etdm_data->mclk_apll;
> > +		apll_clk_id = mt8188_afe_get_mclk_source_clk_id(apll);
> > +		if (apll_clk_id < 0)
> > +			return apll_clk_id;
> > +
> > +		/* select apll */
> > +		ret = mt8188_afe_set_clk_parent(afe, afe_priv-
> > >clk[clk_id],
> > +						afe_priv-
> > >clk[apll_clk_id]);
> > +		if (ret)
> > +			return ret;
> > +
> > +		/* set rate */
> > +		ret = mt8188_afe_set_clk_rate(afe, afe_priv-
> > >clk[clkdiv_id],
> > +					      etdm_data->mclk_freq);
> 
> Check ret here...
> 
> > +	} else {
> > +		if (etdm_data->mclk_dir == SND_SOC_CLOCK_OUT)
> > +			dev_dbg(afe->dev, "%s mclk freq = 0\n",
> > __func__);
> > +	}
> > +
> 
> ...and return 0 here.
> 
> > +	return ret;
> > +}
> > +
> 
> ..snip..
> 
> > +
> > +static int mtk_dai_etdm_hw_params(struct snd_pcm_substream
> > *substream,
> > +				  struct snd_pcm_hw_params *params,
> > +				  struct snd_soc_dai *dai)
> > +{
> > +	int ret = 0;
> > +	unsigned int rate = params_rate(params);
> > +	unsigned int bit_width = params_width(params);
> > +	unsigned int channels = params_channels(params);
> > +	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
> > +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> > +	struct mtk_dai_etdm_priv *mst_etdm_data;
> > +	int mst_dai_id;
> > +	int slv_dai_id;
> > +	int i;
> > +
> > +	dev_dbg(afe->dev, "%s '%s' period %u-%u\n",
> > +		__func__, snd_pcm_stream_str(substream),
> > +		params_period_size(params), params_periods(params));
> > +
> > +	if (is_cowork_mode(dai)) {
> > +		mst_dai_id = get_etdm_cowork_master_id(dai);
> > +		if (!is_valid_etdm_dai(mst_dai_id))
> > +			return -EINVAL;
> > +
> > +		ret = mtk_dai_etdm_mclk_configure(afe, mst_dai_id);
> > +		if (ret)
> > +			return ret;
> > +
> > +		ret = mtk_dai_etdm_configure(afe, rate, channels,
> > +					     bit_width, mst_dai_id);
> > +		if (ret)
> > +			return ret;
> > +
> > +		mst_etdm_data = afe_priv->dai_priv[mst_dai_id];
> > +		for (i = 0; i < mst_etdm_data->cowork_slv_count; i++) {
> > +			slv_dai_id = mst_etdm_data->cowork_slv_id[i];
> > +			ret = mtk_dai_etdm_configure(afe, rate,
> > channels,
> > +						     bit_width,
> > slv_dai_id);
> > +			if (ret)
> > +				return ret;
> > +
> > +			ret = mt8188_etdm_sync_mode_configure(afe,
> > slv_dai_id);
> > +			if (ret)
> > +				return ret;
> > +		}
> > +	} else {
> > +		ret = mtk_dai_etdm_mclk_configure(afe, dai->id);
> > +		if (ret)
> > +			return ret;
> > +
> > +		ret = mtk_dai_etdm_configure(afe, rate, channels,
> > +					     bit_width, dai->id);
> 
> Check return value here...
> 
> > +	}
> > +
> 
> ...and return 0 here.
> 
> > +	return ret;
> > +}
> > +
> > +static int mtk_dai_etdm_prepare(struct snd_pcm_substream
> > *substream,
> > +				struct snd_soc_dai *dai)
> > +{
> > +	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
> > +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> > +	struct mtk_dai_etdm_priv *mst_etdm_data;
> > +	int mst_dai_id;
> > +	int slv_dai_id;
> > +	int i;
> > +	int ret = 0;
> > +
> > +	if (!is_valid_etdm_dai(dai->id))
> > +		return -EINVAL;
> > +	mst_etdm_data = afe_priv->dai_priv[dai->id];
> > +
> > +	dev_dbg(afe->dev, "%s(), dai id %d, prepared %d\n", __func__,
> > dai->id,
> > +		mst_etdm_data->is_prepared);
> > +
> > +	if (mst_etdm_data->is_prepared)
> > +		return 0;
> > +
> > +	mst_etdm_data->is_prepared = true;
> > +
> > +	if (is_cowork_mode(dai)) {
> > +		mst_dai_id = get_etdm_cowork_master_id(dai);
> > +		if (!is_valid_etdm_dai(mst_dai_id))
> > +			return -EINVAL;
> > +		mst_etdm_data = afe_priv->dai_priv[mst_dai_id];
> > +
> > +		for (i = 0; i < mst_etdm_data->cowork_slv_count; i++) {
> > +			slv_dai_id = mst_etdm_data->cowork_slv_id[i];
> > +			ret |= mt8188_afe_enable_etdm(afe, slv_dai_id);
> > +		}
> > +
> > +		ret |= mt8188_afe_enable_etdm(afe, mst_dai_id);
> 
> OR'ing return values is not an acceptable practice: you should check
> for error
> right after the call and immediately take action if anything wrong
> happened.
> 
> > +	} else {
> > +		ret = mt8188_afe_enable_etdm(afe, dai->id);
> 
> Same comment as the previous function: check ret here.
> 
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> 
> ..snip..
> 
> > +
> > +static int mtk_dai_hdmitx_dptx_prepare(struct snd_pcm_substream
> > *substream,
> > +				       struct snd_soc_dai *dai)
> > +{
> > +	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
> > +	struct mt8188_afe_private *afe_priv = afe->platform_priv;
> > +	struct mtk_dai_etdm_priv *etdm_data;
> > +	int ret;
> > +
> > +	if (!is_valid_etdm_dai(dai->id))
> > +		return -EINVAL;
> > +	etdm_data = afe_priv->dai_priv[dai->id];
> > +
> > +	dev_dbg(afe->dev, "%s(), dai id %d, prepared %d\n", __func__,
> > dai->id,
> > +		etdm_data->is_prepared);
> > +
> > +	if (etdm_data->is_prepared)
> > +		return 0;
> > +
> > +	etdm_data->is_prepared = true;
> > +
> > +	/* enable dptx interface */
> > +	if (dai->id == MT8188_AFE_IO_DPTX)
> > +		regmap_set_bits(afe->regmap, AFE_DPTX_CON,
> > AFE_DPTX_CON_ON);
> > +
> > +	/* enable etdm_out3 */
> > +	ret = mt8188_afe_enable_etdm(afe, dai->id);
> 
> You don't need the `ret` variable here...
> 
> 	return mt8188_afe_enable_etdm(afe, dai->id);
> 
> > +
> > +	return ret;
> > +}
> > +
> 
> Apart from this, looks good.
> 
> Regards,
> Angelo
> 

Hi Angelo,

Thanks for your review.
I'll adopt all suggestions in v5.

Thanks,
Trevor