ASoC: rt5663: Add the manual offset field to compensate the DC offset

The patch adds the manual offset field in the devicetree to compensate the
DC offset that will be different between the PCB layout. It only can be
measured by the real production.
Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rt5663.txt

@@ -12,6 +12,11 @@ Required properties:
 
 Optional properties:
 
+- "realtek,dc_offset_l_manual"
+- "realtek,dc_offset_r_manual"
+  Based on the different PCB layout, add the manual offset value to
+  compensate the DC offset for each L and R channel.
+
 Pins on the device (for linking into audio routes) for RT5663:
 
   * IN1P

include/sound/rt5663.h

+/*
+ * linux/sound/rt5663.h -- Platform data for RT5663
+ *
+ * Copyright 2017 Realtek Semiconductor Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_SND_RT5663_H
+#define __LINUX_SND_RT5663_H
+
+struct rt5663_platform_data {
+	unsigned int dc_offset_l_manual;
+	unsigned int dc_offset_r_manual;
+};
+
+#endif
+

sound/soc/codecs/rt5663.c

@@ -40,6 +40,7 @@ enum {
 
 struct rt5663_priv {
 	struct snd_soc_codec *codec;
+	struct rt5663_platform_data pdata;
 	struct regmap *regmap;
 	struct delayed_work jack_detect_work;
 	struct snd_soc_jack *hs_jack;
@@ -57,6 +58,10 @@ struct rt5663_priv {
 	int jack_type;
 };
 
+static const struct reg_sequence rt5663_patch_list[] = {
+	{ 0x002a, 0x8080 },
+};
+
 static const struct reg_default rt5663_v2_reg[] = {
 	{ 0x0000, 0x0000 },
 	{ 0x0001, 0xc8c8 },
@@ -476,7 +481,7 @@ static const struct reg_default rt5663_reg[] = {
 	{ 0x0023, 0x0039 },
 	{ 0x0026, 0xc0c0 },
 	{ 0x0029, 0x8080 },
-	{ 0x002a, 0xa0a0 },
+	{ 0x002a, 0x8080 },
 	{ 0x002c, 0x000c },
 	{ 0x002d, 0x0000 },
 	{ 0x0040, 0x0808 },
@@ -1958,15 +1963,11 @@ static const struct snd_kcontrol_new rt5663_adda_r_mix[] = {
 static const struct snd_kcontrol_new rt5663_sto1_dac_l_mix[] = {
 	SOC_DAPM_SINGLE("DAC L Switch", RT5663_STO_DAC_MIXER,
 			RT5663_M_DAC_L1_STO_L_SHIFT, 1, 1),
-	SOC_DAPM_SINGLE("DAC R Switch", RT5663_STO_DAC_MIXER,
-			RT5663_M_DAC_R1_STO_L_SHIFT, 1, 1),
 };
 
 static const struct snd_kcontrol_new rt5663_sto1_dac_r_mix[] = {
 	SOC_DAPM_SINGLE("DAC L Switch", RT5663_STO_DAC_MIXER,
 			RT5663_M_DAC_L1_STO_R_SHIFT, 1, 1),
-	SOC_DAPM_SINGLE("DAC R Switch", RT5663_STO_DAC_MIXER,
-			RT5663_M_DAC_R1_STO_R_SHIFT, 1, 1),
 };
 
 /* Out Switch */
@@ -3126,9 +3127,20 @@ static void rt5663_calibrate(struct rt5663_priv *rt5663)
 	usleep_range(10000, 10005);
 }
 
+static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
+{
+	device_property_read_u32(dev, "realtek,dc_offset_l_manual",
+		&rt5663->pdata.dc_offset_l_manual);
+	device_property_read_u32(dev, "realtek,dc_offset_r_manual",
+		&rt5663->pdata.dc_offset_r_manual);
+
+	return 0;
+}
+
 static int rt5663_i2c_probe(struct i2c_client *i2c,
 		    const struct i2c_device_id *id)
 {
+	struct rt5663_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct rt5663_priv *rt5663;
 	int ret;
 	unsigned int val;
@@ -3142,6 +3154,11 @@ static int rt5663_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, rt5663);
 
+	if (pdata)
+		rt5663->pdata = *pdata;
+	else
+		rt5663_parse_dp(rt5663, &i2c->dev);
+
 	regmap = devm_regmap_init_i2c(i2c, &temp_regmap);
 	if (IS_ERR(regmap)) {
 		ret = PTR_ERR(regmap);
@@ -3190,6 +3207,34 @@ static int rt5663_i2c_probe(struct i2c_client *i2c,
 	regmap_write(rt5663->regmap, RT5663_RESET, 0);
 	dev_dbg(&i2c->dev, "calibrate done\n");
 
+	switch (rt5663->codec_ver) {
+	case CODEC_VER_1:
+		break;
+	case CODEC_VER_0:
+		ret = regmap_register_patch(rt5663->regmap, rt5663_patch_list,
+					    ARRAY_SIZE(rt5663_patch_list));
+		if (ret != 0)
+			dev_warn(&i2c->dev,
+				"Failed to apply regmap patch: %d\n", ret);
+		break;
+	default:
+		dev_err(&i2c->dev, "%s:Unknown codec type\n", __func__);
+	}
+
+	if (rt5663->pdata.dc_offset_l_manual) {
+		regmap_write(rt5663->regmap, RT5663_MIC_DECRO_2,
+			rt5663->pdata.dc_offset_l_manual >> 16);
+		regmap_write(rt5663->regmap, RT5663_MIC_DECRO_3,
+			rt5663->pdata.dc_offset_l_manual & 0xffff);
+	}
+
+	if (rt5663->pdata.dc_offset_r_manual) {
+		regmap_write(rt5663->regmap, RT5663_MIC_DECRO_5,
+			rt5663->pdata.dc_offset_r_manual >> 16);
+		regmap_write(rt5663->regmap, RT5663_MIC_DECRO_6,
+			rt5663->pdata.dc_offset_r_manual & 0xffff);
+	}
+
 	/* GPIO1 as IRQ */
 	regmap_update_bits(rt5663->regmap, RT5663_GPIO_1, RT5663_GP1_PIN_MASK,
 		RT5663_GP1_PIN_IRQ);

sound/soc/codecs/rt5663.h

@@ -12,6 +12,8 @@
 #ifndef __RT5663_H__
 #define __RT5663_H__
 
+#include <sound/rt5663.h>
+
 /* Info */
 #define RT5663_RESET				0x0000
 #define RT5663_VENDOR_ID			0x00fd