ASoC: rt1308-sdw: get calibration params after power on

It will be safe when getting the calibration params after power-on.
All powers are ready to read the calibration params from EFUSE.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220315093740.12008-1-shumingf@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt1308-sdw.c

@@ -50,6 +50,8 @@ static bool rt1308_volatile_register(struct device *dev, unsigned int reg)
 	case 0x3008:
 	case 0x300a:
 	case 0xc000:
+	case 0xc860 ... 0xc863:
+	case 0xc870 ... 0xc873:
 		return true;
 	default:
 		return false;
@@ -159,12 +161,45 @@ static int rt1308_read_prop(struct sdw_slave *slave)
 	return 0;
 }
 
+static void rt1308_apply_calib_params(struct rt1308_sdw_priv *rt1308)
+{
+	unsigned int efuse_m_btl_l, efuse_m_btl_r, tmp;
+	unsigned int efuse_c_btl_l, efuse_c_btl_r;
+
+	/* read efuse to apply calibration parameters */
+	regmap_write(rt1308->regmap, 0xc7f0, 0x04);
+	regmap_write(rt1308->regmap, 0xc7f1, 0xfe);
+	msleep(100);
+	regmap_write(rt1308->regmap, 0xc7f0, 0x44);
+	msleep(20);
+	regmap_write(rt1308->regmap, 0xc240, 0x10);
+
+	regmap_read(rt1308->regmap, 0xc861, &tmp);
+	efuse_m_btl_l = tmp;
+	regmap_read(rt1308->regmap, 0xc860, &tmp);
+	efuse_m_btl_l = efuse_m_btl_l | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc863, &tmp);
+	efuse_c_btl_l = tmp;
+	regmap_read(rt1308->regmap, 0xc862, &tmp);
+	efuse_c_btl_l = efuse_c_btl_l | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc871, &tmp);
+	efuse_m_btl_r = tmp;
+	regmap_read(rt1308->regmap, 0xc870, &tmp);
+	efuse_m_btl_r = efuse_m_btl_r | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc873, &tmp);
+	efuse_c_btl_r = tmp;
+	regmap_read(rt1308->regmap, 0xc872, &tmp);
+	efuse_c_btl_r = efuse_c_btl_r | (tmp << 8);
+	dev_dbg(&rt1308->sdw_slave->dev, "%s m_btl_l=0x%x, m_btl_r=0x%x\n", __func__,
+		efuse_m_btl_l, efuse_m_btl_r);
+	dev_dbg(&rt1308->sdw_slave->dev, "%s c_btl_l=0x%x, c_btl_r=0x%x\n", __func__,
+		efuse_c_btl_l, efuse_c_btl_r);
+}
+
 static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 {
 	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
 	int ret = 0;
-	unsigned int efuse_m_btl_l, efuse_m_btl_r, tmp;
-	unsigned int efuse_c_btl_l, efuse_c_btl_r;
 
 	if (rt1308->hw_init)
 		return 0;
@@ -196,37 +231,6 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 	/* sw reset */
 	regmap_write(rt1308->regmap, RT1308_SDW_RESET, 0);
 
-	/* read efuse */
-	regmap_write(rt1308->regmap, 0xc360, 0x01);
-	regmap_write(rt1308->regmap, 0xc361, 0x80);
-	regmap_write(rt1308->regmap, 0xc7f0, 0x04);
-	regmap_write(rt1308->regmap, 0xc7f1, 0xfe);
-	msleep(100);
-	regmap_write(rt1308->regmap, 0xc7f0, 0x44);
-	msleep(20);
-	regmap_write(rt1308->regmap, 0xc240, 0x10);
-
-	regmap_read(rt1308->regmap, 0xc861, &tmp);
-	efuse_m_btl_l = tmp;
-	regmap_read(rt1308->regmap, 0xc860, &tmp);
-	efuse_m_btl_l = efuse_m_btl_l | (tmp << 8);
-	regmap_read(rt1308->regmap, 0xc863, &tmp);
-	efuse_c_btl_l = tmp;
-	regmap_read(rt1308->regmap, 0xc862, &tmp);
-	efuse_c_btl_l = efuse_c_btl_l | (tmp << 8);
-	regmap_read(rt1308->regmap, 0xc871, &tmp);
-	efuse_m_btl_r = tmp;
-	regmap_read(rt1308->regmap, 0xc870, &tmp);
-	efuse_m_btl_r = efuse_m_btl_r | (tmp << 8);
-	regmap_read(rt1308->regmap, 0xc873, &tmp);
-	efuse_c_btl_r = tmp;
-	regmap_read(rt1308->regmap, 0xc872, &tmp);
-	efuse_c_btl_r = efuse_c_btl_r | (tmp << 8);
-	dev_dbg(&slave->dev, "%s m_btl_l=0x%x, m_btl_r=0x%x\n", __func__,
-		efuse_m_btl_l, efuse_m_btl_r);
-	dev_dbg(&slave->dev, "%s c_btl_l=0x%x, c_btl_r=0x%x\n", __func__,
-		efuse_c_btl_l, efuse_c_btl_r);
-
 	/* initial settings */
 	regmap_write(rt1308->regmap, 0xc103, 0xc0);
 	regmap_write(rt1308->regmap, 0xc030, 0x17);
@@ -323,6 +327,8 @@ static int rt1308_classd_event(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_component *component =
 		snd_soc_dapm_to_component(w->dapm);
+	struct rt1308_sdw_priv *rt1308 =
+		snd_soc_component_get_drvdata(component);
 
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
@@ -331,6 +337,7 @@ static int rt1308_classd_event(struct snd_soc_dapm_widget *w,
 			RT1308_SDW_OFFSET | (RT1308_POWER_STATUS << 4),
 			0x3,	0x3);
 		msleep(40);
+		rt1308_apply_calib_params(rt1308);
 		break;
 	case SND_SOC_DAPM_PRE_PMD:
 		snd_soc_component_update_bits(component,