ASoC: mediatek: mt6359: add mtkaif gpio setting

Add mtkaif gpio driving to increase signal strength and smt setting to
prevent from overshooting.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20230508071532.21665-4-trevor.wu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/mt6359.c

@@ -18,6 +18,20 @@
 
 #include "mt6359.h"
 
+static void mt6359_set_gpio_smt(struct mt6359_priv *priv)
+{
+	/* set gpio SMT mode */
+	regmap_update_bits(priv->regmap, MT6359_SMT_CON1, 0x3ff0, 0x3ff0);
+}
+
+static void mt6359_set_gpio_driving(struct mt6359_priv *priv)
+{
+	/* 8:4mA(default), a:8mA, c:12mA, e:16mA */
+	regmap_update_bits(priv->regmap, MT6359_DRV_CON2, 0xffff, 0x8888);
+	regmap_update_bits(priv->regmap, MT6359_DRV_CON3, 0xffff, 0x8888);
+	regmap_update_bits(priv->regmap, MT6359_DRV_CON4, 0x00ff, 0x88);
+}
+
 static void mt6359_set_playback_gpio(struct mt6359_priv *priv)
 {
 	/* set gpio mosi mode, clk / data mosi */
@@ -2745,6 +2759,8 @@ static int mt6359_codec_init_reg(struct snd_soc_component *cmpnt)
 			   0x1 << RG_AUDLOLSCDISABLE_VAUDP32_SFT);
 
 	/* set gpio */
+	mt6359_set_gpio_smt(priv);
+	mt6359_set_gpio_driving(priv);
 	mt6359_reset_playback_gpio(priv);
 	mt6359_reset_capture_gpio(priv);