ASoC: mediatek: mt6359: update route for lineout mux

Originally, lineout playback source can only be DAC_3RD. Some SoC
masters only support stereo MTKAIF outputs, so lineout path can't be
used in such case.

MTKAIF connections are as follows.
MOSI0 -> DAC_L
MOSI1 -> DAC_R
MOSI2 -> DAC_3rd

In the patch, lineout playback source can be chosen between DAC_L and
DAC_3rd, so sound can be outputted via lineout even though SoC only
supports stereo MTKAIF outputs.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20230508071532.21665-5-trevor.wu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/mt6359.c

@@ -1159,9 +1159,10 @@ static int mt_lo_event(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_component *cmpnt = snd_soc_dapm_to_component(w->dapm);
 	struct mt6359_priv *priv = snd_soc_component_get_drvdata(cmpnt);
+	unsigned int mux = dapm_kcontrol_get_value(w->kcontrols[0]);
 
 	dev_dbg(priv->dev, "%s(), event 0x%x, mux %u\n",
-		__func__, event, dapm_kcontrol_get_value(w->kcontrols[0]));
+		__func__, event, mux);
 
 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
@@ -1199,14 +1200,29 @@ static int mt_lo_event(struct snd_soc_dapm_widget *w,
 		/* Enable AUD_CLK */
 		mt6359_set_decoder_clk(priv, true);
 
-		/* Enable Audio DAC (3rd DAC) */
-		regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON7, 0x3113);
-		/* Enable low-noise mode of DAC */
-		if (priv->dev_counter[DEVICE_HP] == 0)
-			regmap_write(priv->regmap,
-				     MT6359_AUDDEC_ANA_CON9, 0x0001);
-		/* Switch LOL MUX to audio 3rd DAC */
-		regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON7, 0x311b);
+		/* Switch LOL MUX to audio DAC */
+		if (mux == LO_MUX_L_DAC) {
+			if (priv->dev_counter[DEVICE_HP] > 0) {
+				dev_info(priv->dev, "%s(), can not enable DAC, hp count %d\n",
+					 __func__, priv->dev_counter[DEVICE_HP]);
+				break;
+			}
+			/* Enable DACL and switch HP MUX to open*/
+			regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON0, 0x3009);
+			/* Disable low-noise mode of DAC */
+			regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON9, 0xf200);
+			usleep_range(100, 120);
+			/* Switch LOL MUX to DACL */
+			regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON7, 0x0117);
+		} else if (mux == LO_MUX_3RD_DAC) {
+			/* Enable Audio DAC (3rd DAC) */
+			regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON7, 0x3113);
+			/* Enable low-noise mode of DAC */
+			if (priv->dev_counter[DEVICE_HP] == 0)
+				regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON9, 0x0001);
+			/* Switch LOL MUX to audio 3rd DAC */
+			regmap_write(priv->regmap, MT6359_AUDDEC_ANA_CON7, 0x311b);
+		}
 		break;
 	case SND_SOC_DAPM_PRE_PMD:
 		/* Switch LOL MUX to open */
@@ -1218,6 +1234,15 @@ static int mt_lo_event(struct snd_soc_dapm_widget *w,
 		regmap_update_bits(priv->regmap, MT6359_AUDDEC_ANA_CON0,
 				   0x000f, 0x0000);
 
+		if (mux == LO_MUX_L_DAC) {
+			/* Disable HP driver core circuits */
+			regmap_update_bits(priv->regmap, MT6359_AUDDEC_ANA_CON0,
+					   0x3 << 4, 0x0);
+			/* Disable HP driver bias circuits */
+			regmap_update_bits(priv->regmap, MT6359_AUDDEC_ANA_CON0,
+					   0x3 << 6, 0x0);
+		}
+
 		/* Disable AUD_CLK */
 		mt6359_set_decoder_clk(priv, false);
 
@@ -2590,6 +2615,7 @@ static const struct snd_soc_dapm_route mt6359_dapm_routes[] = {
 
 	/* Lineout Path */
 	{"LOL Mux", "Playback", "DAC_3RD"},
+	{"LOL Mux", "Playback_L_DAC", "DACL"},
 	{"LINEOUT L", NULL, "LOL Mux"},
 
 	/* Headphone Path */