+static int mt8195_rt5682_etdm_hw_params(struct snd_pcm_substream *substream,
+					struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
+	unsigned int rate = params_rate(params);
+	unsigned int mclk_fs_ratio = 128;
+	unsigned int mclk_fs = rate * mclk_fs_ratio;
+	int bitwidth;
+	int ret;
+
+	bitwidth = snd_pcm_format_width(params_format(params));
+	if (bitwidth < 0) {
+		dev_err(card->dev, "invalid bit width: %d\n", bitwidth);
+		return bitwidth;
+	}
+
+	ret = snd_soc_dai_set_tdm_slot(codec_dai, 0x00, 0x0, 0x2, bitwidth);
+	if (ret) {
+		dev_err(card->dev, "failed to set tdm slot\n");
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_pll(codec_dai, RT5682_PLL1,
+				  RT5682_PLL1_S_BCLK1,
+				  params_rate(params) * 64,
+				  params_rate(params) * 512);
+	if (ret) {
+		dev_err(card->dev, "failed to set pll\n");
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_sysclk(codec_dai,
+				     RT5682_SCLK_S_PLL1,
+				     params_rate(params) * 512,
+				     SND_SOC_CLOCK_IN);
+	if (ret) {
+		dev_err(card->dev, "failed to set sysclk\n");
+		return ret;
+	}
+
+	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_fs, SND_SOC_CLOCK_OUT);

If you are using params_rate(params) x factor, then it'd be more
consistent to use:

return snd_soc_dai_set_sysclk(cpu_dai, 0, params_rate(params) * 128,
SND_SOC_CLOCK_OUT);

+static int mt8195_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *cmpnt_afe =
+		snd_soc_rtdcom_lookup(rtd, AFE_PCM_NAME);
+	struct snd_soc_component *cmpnt_codec =
+		asoc_rtd_to_codec(rtd, 0)->component;
+	struct mtk_base_afe *afe = snd_soc_component_get_drvdata(cmpnt_afe);
+	struct mt8195_afe_private *afe_priv = afe->platform_priv;
+	struct mtkaif_param *param = &afe_priv->mtkaif_params;
+	int phase;
+	unsigned int monitor;
+	int mtkaif_calibration_num_phase;
+	int test_done_1, test_done_2, test_done_3;
+	int cycle_1, cycle_2, cycle_3;
+	int prev_cycle_1, prev_cycle_2, prev_cycle_3;
+	int chosen_phase_1, chosen_phase_2, chosen_phase_3;
+	int counter;
+	bool mtkaif_calibration_ok;
+	int mtkaif_chosen_phase[MT8195_MTKAIF_MISO_NUM];
+	int mtkaif_phase_cycle[MT8195_MTKAIF_MISO_NUM];
+	int i;

reverse x-mas style with longer declarations first?

+
+	dev_info(afe->dev, "%s(), start\n", __func__);

dev_dbg

+
+	param->mtkaif_calibration_ok = false;
+	for (i = 0; i < MT8195_MTKAIF_MISO_NUM; i++) {
+		param->mtkaif_chosen_phase[i] = -1;
+		param->mtkaif_phase_cycle[i] = 0;
+		mtkaif_chosen_phase[i] = -1;
+		mtkaif_phase_cycle[i] = 0;
+	}
+
+	if (IS_ERR(afe_priv->topckgen)) {
+		dev_info(afe->dev, "%s() Cannot find topckgen controller\n",
+			 __func__);
+		return 0;

is this not an error? Why not dev_err() and return -EINVAL or something?

+	}
+
+	pm_runtime_get_sync(afe->dev);

test if this worked?

+	mt6359_mtkaif_calibration_enable(cmpnt_codec);
+
+	/* set test type to synchronizer pulse */
+	regmap_update_bits(afe_priv->topckgen,
+			   CKSYS_AUD_TOP_CFG, 0xffff, 0x4);
+	mtkaif_calibration_num_phase = 42;	/* mt6359: 0 ~ 42 */
+	mtkaif_calibration_ok = true;
+
+	for (phase = 0;
+	     phase <= mtkaif_calibration_num_phase && mtkaif_calibration_ok;
+	     phase++) {
+		mt6359_set_mtkaif_calibration_phase(cmpnt_codec,
+						    phase, phase, phase);
+
+		regmap_update_bits(afe_priv->topckgen,
+				   CKSYS_AUD_TOP_CFG, 0x1, 0x1);
+
+		test_done_1 = 0;
+		test_done_2 = 0;
+		test_done_3 = 0;
+		cycle_1 = -1;
+		cycle_2 = -1;
+		cycle_3 = -1;
+		counter = 0;
+		while (!(test_done_1 & test_done_2 & test_done_3)) {
+			regmap_read(afe_priv->topckgen,
+				    CKSYS_AUD_TOP_MON, &monitor);
+			test_done_1 = (monitor >> 28) & 0x1;
+			test_done_2 = (monitor >> 29) & 0x1;
+			test_done_3 = (monitor >> 30) & 0x1;
+			if (test_done_1 == 1)
+				cycle_1 = monitor & 0xf;
+
+			if (test_done_2 == 1)
+				cycle_2 = (monitor >> 4) & 0xf;
+
+			if (test_done_3 == 1)
+				cycle_3 = (monitor >> 8) & 0xf;
+
+			/* handle if never test done */
+			if (++counter > 10000) {
+				dev_info(afe->dev, "%s(), test fail, cycle_1 %d, cycle_2 %d, cycle_3 %d, monitor 0x%x\n",
+					 __func__,
+					 cycle_1, cycle_2, cycle_3, monitor);
+				mtkaif_calibration_ok = false;
+				break;
+			}
+		}
+
+		if (phase == 0) {
+			prev_cycle_1 = cycle_1;
+			prev_cycle_2 = cycle_2;
+			prev_cycle_3 = cycle_3;
+		}
+
+		if (cycle_1 != prev_cycle_1 &&
+		    mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0] < 0) {
+			mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0] = phase - 1;
+			mtkaif_phase_cycle[MT8195_MTKAIF_MISO_0] = prev_cycle_1;
+		}
+
+		if (cycle_2 != prev_cycle_2 &&
+		    mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1] < 0) {
+			mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1] = phase - 1;
+			mtkaif_phase_cycle[MT8195_MTKAIF_MISO_1] = prev_cycle_2;
+		}
+
+		if (cycle_3 != prev_cycle_3 &&
+		    mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2] < 0) {
+			mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2] = phase - 1;
+			mtkaif_phase_cycle[MT8195_MTKAIF_MISO_2] = prev_cycle_3;
+		}
+
+		regmap_update_bits(afe_priv->topckgen,
+				   CKSYS_AUD_TOP_CFG, 0x1, 0x0);
+
+		if (mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0] >= 0 &&
+		    mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1] >= 0 &&
+		    mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2] >= 0)
+			break;
+	}
+
+	if (mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0] < 0) {
+		mtkaif_calibration_ok = false;
+		chosen_phase_1 = 0;
+	} else {
+		chosen_phase_1 = mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0];
+	}
+
+	if (mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1] < 0) {
+		mtkaif_calibration_ok = false;
+		chosen_phase_2 = 0;
+	} else {
+		chosen_phase_2 = mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1];
+	}
+
+	if (mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2] < 0) {
+		mtkaif_calibration_ok = false;
+		chosen_phase_3 = 0;
+	} else {
+		chosen_phase_3 = mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2];
+	}
+
+	mt6359_set_mtkaif_calibration_phase(cmpnt_codec,
+					    chosen_phase_1,
+					    chosen_phase_2,
+					    chosen_phase_3);
+
+	mt6359_mtkaif_calibration_disable(cmpnt_codec);
+	pm_runtime_put(afe->dev);
+
+	param->mtkaif_calibration_ok = mtkaif_calibration_ok;
+	param->mtkaif_chosen_phase[MT8195_MTKAIF_MISO_0] = chosen_phase_1;
+	param->mtkaif_chosen_phase[MT8195_MTKAIF_MISO_1] = chosen_phase_2;
+	param->mtkaif_chosen_phase[MT8195_MTKAIF_MISO_2] = chosen_phase_3;
+	for (i = 0; i < MT8195_MTKAIF_MISO_NUM; i++)
+		param->mtkaif_phase_cycle[i] = mtkaif_phase_cycle[i];
+
+	dev_info(afe->dev, "%s(), end, calibration ok %d\n",
+		 __func__, param->mtkaif_calibration_ok);

dev_dbg?

+
+	return 0;
+}
+

+static int mt8195_hdmitx_dptx_startup(struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		48000
+	};
+	static const unsigned int channels[] = {
+		2, 4, 6, 8
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_channels = {
+		.count = ARRAY_SIZE(channels),
+		.list  = channels,
+		.mask = 0,
+	};

you use the same const tables several times, move to a higher scope and
reuse?

+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int ret;
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 &constraints_rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_CHANNELS,
+					 &constraints_channels);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list channel failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8195_hdmitx_dptx_playback_ops = {
+	.startup = mt8195_hdmitx_dptx_startup,
+};
+
+static int mt8195_dptx_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
+	unsigned int rate = params_rate(params);
+	unsigned int mclk_fs_ratio = 256;
+	unsigned int mclk_fs = rate * mclk_fs_ratio;
+
+	return snd_soc_dai_set_sysclk(cpu_dai, 0, mclk_fs,
+				      SND_SOC_CLOCK_OUT);

return snd_soc_dai_set_sysclk(cpu_dai, 0, params_rate(params) * 256,
SND_SOC_CLOCK_OUT);
?

+static int mt8195_dptx_codec_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct mt8195_mt6359_rt1011_rt5682_priv *priv =
+		snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_component *cmpnt_codec =
+		asoc_rtd_to_codec(rtd, 0)->component;
+	int ret = 0;

unnecessary init

+	ret = snd_soc_card_jack_new(rtd->card, "DP Jack", SND_JACK_LINEOUT,
+				    &priv->dp_jack, NULL, 0);
+	if (ret)
+		return ret;
+
+	return snd_soc_component_set_jack(cmpnt_codec, &priv->dp_jack, NULL);
+}
+
+static int mt8195_hdmi_codec_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct mt8195_mt6359_rt1011_rt5682_priv *priv =
+		snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_component *cmpnt_codec =
+		asoc_rtd_to_codec(rtd, 0)->component;
+	int ret = 0;

unnecessary init

+	ret = snd_soc_card_jack_new(rtd->card, "HDMI Jack", SND_JACK_LINEOUT,
+				    &priv->hdmi_jack, NULL, 0);
+	if (ret)
+		return ret;
+
+	return snd_soc_component_set_jack(cmpnt_codec, &priv->hdmi_jack, NULL);
+}
+
+static int mt8195_hdmitx_dptx_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
+					      struct snd_pcm_hw_params *params)
+

spurious line?

+{
+	/* fix BE i2s format to 32bit, clean param mask first */
+	snd_mask_reset_range(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT),
+			     0, (__force unsigned int)SNDRV_PCM_FORMAT_LAST);
+
+	params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
+
+	return 0;
+}
+
+static int mt8195_playback_startup(struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		48000
+	};
+	static const unsigned int channels[] = {
+		2
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_channels = {
+		.count = ARRAY_SIZE(channels),
+		.list  = channels,
+		.mask = 0,
+	};

actually now I realize it's only the number of channels that differs...

+
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int ret;
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 &constraints_rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_CHANNELS,
+					 &constraints_channels);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list channel failed\n");
+		return ret;
+	}
+
+	return 0;
+}

+static struct snd_soc_dai_link mt8195_mt6359_rt1011_rt5682_dai_links[] = {
+	/* FE */
+	[DAI_LINK_DL2_FE] = {
+		.name = "DL2_FE",
+		.stream_name = "DL2 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_playback_ops,
+		SND_SOC_DAILINK_REG(DL2_FE),
+	},
+	[DAI_LINK_DL3_FE] = {
+		.name = "DL3_FE",
+		.stream_name = "DL3 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_playback_ops,
+		SND_SOC_DAILINK_REG(DL3_FE),
+	},
+	[DAI_LINK_DL6_FE] = {
+		.name = "DL6_FE",
+		.stream_name = "DL6 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_playback_ops,
+		SND_SOC_DAILINK_REG(DL6_FE),
+	},
+	[DAI_LINK_DL7_FE] = {
+		.name = "DL7_FE",
+		.stream_name = "DL7 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_PRE,
+			SND_SOC_DPCM_TRIGGER_PRE,
+		},

this is interesting, is it intentional that the trigger order is
different from all FEs?

+		.dynamic = 1,
+		.dpcm_playback = 1,

also no .ops?

+		SND_SOC_DAILINK_REG(DL7_FE),
+	},
+	[DAI_LINK_DL8_FE] = {
+		.name = "DL8_FE",
+		.stream_name = "DL8 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_playback_ops,
+		SND_SOC_DAILINK_REG(DL8_FE),
+	},
+	[DAI_LINK_DL10_FE] = {
+		.name = "DL10_FE",
+		.stream_name = "DL10 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_hdmitx_dptx_playback_ops,
+		SND_SOC_DAILINK_REG(DL10_FE),
+	},
+	[DAI_LINK_DL11_FE] = {
+		.name = "DL11_FE",
+		.stream_name = "DL11 Playback",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_POST,
+			SND_SOC_DPCM_TRIGGER_POST,
+		},
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		.ops = &mt8195_playback_ops,
+		SND_SOC_DAILINK_REG(DL11_FE),
+	},
+	[DAI_LINK_UL1_FE] = {
+		.name = "UL1_FE",
+		.stream_name = "UL1 Capture",
+		.trigger = {
+			SND_SOC_DPCM_TRIGGER_PRE,
+			SND_SOC_DPCM_TRIGGER_PRE,

and again here, why PRE and no ops?

+static int mt8195_mt6359_rt1011_rt5682_dev_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &mt8195_mt6359_rt1011_rt5682_soc_card;
+	struct device_node *platform_node;
+	struct snd_soc_dai_link *dai_link;
+	struct mt8195_mt6359_rt1011_rt5682_priv *priv = NULL;

initialization is not necessary

+	int ret, i;
+
+	card->dev = &pdev->dev;
+
+	platform_node = of_parse_phandle(pdev->dev.of_node,
+					 "mediatek,platform", 0);
+	if (!platform_node) {
+		dev_dbg(&pdev->dev, "Property 'platform' missing or invalid\n");
+		return -EINVAL;
+	}
+
+	for_each_card_prelinks(card, i, dai_link) {
+		if (!dai_link->platforms->name)
+			dai_link->platforms->of_node = platform_node;
+
+		if (strcmp(dai_link->name, "DPTX_BE") == 0) {
+			dai_link->codecs->of_node =
+				of_parse_phandle(pdev->dev.of_node,
+						 "mediatek,dptx-codec", 0);
+			if (!dai_link->codecs->of_node) {
+				dev_dbg(&pdev->dev, "No property 'dptx-codec'\n");
+			} else {
+				dai_link->codecs->name = NULL;
+				dai_link->codecs->dai_name = "i2s-hifi";
+				dai_link->init = mt8195_dptx_codec_init;
+			}
+		}
+
+		if (strcmp(dai_link->name, "ETDM3_OUT_BE") == 0) {
+			dai_link->codecs->of_node =
+				of_parse_phandle(pdev->dev.of_node,
+						 "mediatek,hdmi-codec", 0);
+			if (!dai_link->codecs->of_node) {
+				dev_dbg(&pdev->dev, "No property 'hdmi-codec'\n");
+			} else {
+				dai_link->codecs->name = NULL;
+				dai_link->codecs->dai_name = "i2s-hifi";
+				dai_link->init = mt8195_hdmi_codec_init;
+			}
+		}
+	}
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	snd_soc_card_set_drvdata(card, priv);
+
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
+	if (ret)
+		dev_err(&pdev->dev, "%s snd_soc_register_card fail %d\n",
+			__func__, ret);
+	return ret;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id mt8195_mt6359_rt1011_rt5682_dt_match[] = {
+	{.compatible = "mediatek,mt8195_mt6359_rt1011_rt5682",},
+	{}
+};
+#endif
+
+static const struct dev_pm_ops mt8195_mt6359_rt1011_rt5682_pm_ops = {
+	.poweroff = snd_soc_poweroff,
+	.restore = snd_soc_resume,
+};
+
+static struct platform_driver mt8195_mt6359_rt1011_rt5682_driver = {
+	.driver = {
+		.name = "mt8195_mt6359_rt1011_rt5682",
+#ifdef CONFIG_OF
+		.of_match_table = mt8195_mt6359_rt1011_rt5682_dt_match,
+#endif
+		.pm = &mt8195_mt6359_rt1011_rt5682_pm_ops,
+	},
+	.probe = mt8195_mt6359_rt1011_rt5682_dev_probe,
+};
+
+module_platform_driver(mt8195_mt6359_rt1011_rt5682_driver);
+
+/* Module information */
+MODULE_DESCRIPTION("MT8195-MT6359-RT1011-RT5682 ALSA SoC machine driver");
+MODULE_AUTHOR("Trevor Wu [off-list ref]");
+MODULE_LICENSE("GPL v2");

"GPL" is enough

+MODULE_ALIAS("mt8195_mt6359_rt1011_rt5682 soc card");

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