ASoC: mediatek: mt8188-mt6359: support dynamic pinctrl

To avoid power leakage, it is recommended to replace the default pinctrl
state with dynamic pinctrl since certain audio pinmux functions can
remain in a HIGH state even when audio is disabled. Linking pinctrl with
DAPM using SND_SOC_DAPM_PINCTRL will ensure that audio pins remain in
GPIO mode by default and only switch to an audio function when necessary.

Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230825024935.10878-2-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: wenliangwu

sound/soc/mediatek/mt8188/mt8188-mt6359.c

@@ -246,6 +246,11 @@ static const struct snd_soc_dapm_widget mt8188_mt6359_widgets[] = {
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
 	SND_SOC_DAPM_SINK("HDMI"),
 	SND_SOC_DAPM_SINK("DP"),
+
+	/* dynamic pinctrl */
+	SND_SOC_DAPM_PINCTRL("ETDM_SPK_PIN", "aud_etdm_spk_on", "aud_etdm_spk_off"),
+	SND_SOC_DAPM_PINCTRL("ETDM_HP_PIN", "aud_etdm_hp_on", "aud_etdm_hp_off"),
+	SND_SOC_DAPM_PINCTRL("MTKAIF_PIN", "aud_mtkaif_on", "aud_mtkaif_off"),
 };
 
 static const struct snd_kcontrol_new mt8188_mt6359_controls[] = {
@@ -267,6 +272,7 @@ static int mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
 		snd_soc_rtdcom_lookup(rtd, AFE_PCM_NAME);
 	struct snd_soc_component *cmpnt_codec =
 		asoc_rtd_to_codec(rtd, 0)->component;
+	struct snd_soc_dapm_widget *pin_w = NULL, *w;
 	struct mtk_base_afe *afe;
 	struct mt8188_afe_private *afe_priv;
 	struct mtkaif_param *param;
@@ -306,6 +312,18 @@ static int mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
 		return 0;
 	}
 
+	for_each_card_widgets(rtd->card, w) {
+		if (!strcmp(w->name, "MTKAIF_PIN")) {
+			pin_w = w;
+			break;
+		}
+	}
+
+	if (pin_w)
+		dapm_pinctrl_event(pin_w, NULL, SND_SOC_DAPM_PRE_PMU);
+	else
+		dev_dbg(afe->dev, "%s(), no pinmux widget, please check if default on\n", __func__);
+
 	pm_runtime_get_sync(afe->dev);
 	mt6359_mtkaif_calibration_enable(cmpnt_codec);
 
@@ -403,6 +421,9 @@ static int mt8188_mt6359_mtkaif_calibration(struct snd_soc_pcm_runtime *rtd)
 	for (i = 0; i < MT8188_MTKAIF_MISO_NUM; i++)
 		param->mtkaif_phase_cycle[i] = mtkaif_phase_cycle[i];
 
+	if (pin_w)
+		dapm_pinctrl_event(pin_w, NULL, SND_SOC_DAPM_POST_PMD);
+
 	dev_dbg(afe->dev, "%s(), end, calibration ok %d\n",
 		__func__, param->mtkaif_calibration_ok);