ASoC: codecs: ES8326: Improving the THD+N performance

We update the values of some registers in the initialization
sequence in es8326_resume function to improve THD+N performance.
THD+N performance decreases if the output level on headphone is
close to full scale. So we change the register setting in
es8326_jack_detect_handler function to improve THD+N performance
if headphone pulgged. Also, the register setting should be restored
when the headset is unplugged

Signed-off-by: Zhu Ning <zhuning0077@gmail.com>
Link: https://msgid.link/r/20240120101240.12496-3-zhuning0077@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Zhu Ning

sound/soc/codecs/es8326.c

@@ -752,6 +752,8 @@ static void es8326_jack_detect_handler(struct work_struct *work)
 			es8326->hp = 0;
 		}
 		regmap_update_bits(es8326->regmap, ES8326_HPDET_TYPE, 0x03, 0x01);
+		regmap_write(es8326->regmap, ES8326_SYS_BIAS, 0x0a);
+		regmap_update_bits(es8326->regmap, ES8326_HP_DRIVER_REF, 0x0f, 0x03);
 		/*
 		 * Inverted HPJACK_POL bit to trigger one IRQ to double check HP Removal event
 		 */
@@ -777,6 +779,8 @@ static void es8326_jack_detect_handler(struct work_struct *work)
 			regmap_update_bits(es8326->regmap, ES8326_HPDET_TYPE, 0x03, 0x01);
 			usleep_range(50000, 70000);
 			regmap_update_bits(es8326->regmap, ES8326_HPDET_TYPE, 0x03, 0x00);
+			regmap_write(es8326->regmap, ES8326_SYS_BIAS, 0x1f);
+			regmap_update_bits(es8326->regmap, ES8326_HP_DRIVER_REF, 0x0f, 0x08);
 			queue_delayed_work(system_wq, &es8326->jack_detect_work,
 					msecs_to_jiffies(400));
 			es8326->hp = 1;
@@ -846,14 +850,14 @@ static int es8326_calibrate(struct snd_soc_component *component)
 	if ((es8326->version == ES8326_VERSION_B) && (es8326->calibrated == false)) {
 		dev_dbg(component->dev, "ES8326_VERSION_B, calibrating\n");
 		regmap_write(es8326->regmap, ES8326_CLK_INV, 0xc0);
-		regmap_write(es8326->regmap, ES8326_CLK_DIV1, 0x01);
+		regmap_write(es8326->regmap, ES8326_CLK_DIV1, 0x03);
 		regmap_write(es8326->regmap, ES8326_CLK_DLL, 0x30);
 		regmap_write(es8326->regmap, ES8326_CLK_MUX, 0xed);
 		regmap_write(es8326->regmap, ES8326_CLK_DAC_SEL, 0x08);
 		regmap_write(es8326->regmap, ES8326_CLK_TRI, 0xc1);
 		regmap_write(es8326->regmap, ES8326_DAC_MUTE, 0x03);
 		regmap_write(es8326->regmap, ES8326_ANA_VSEL, 0x7f);
-		regmap_write(es8326->regmap, ES8326_VMIDLOW, 0x03);
+		regmap_write(es8326->regmap, ES8326_VMIDLOW, 0x23);
 		regmap_write(es8326->regmap, ES8326_DAC2HPMIX, 0x88);
 		usleep_range(15000, 20000);
 		regmap_write(es8326->regmap, ES8326_HP_OFFSET_CAL, 0x8c);
@@ -894,28 +898,29 @@ static int es8326_resume(struct snd_soc_component *component)
 	/* reset internal clock state */
 	regmap_write(es8326->regmap, ES8326_RESET, 0x1f);
 	regmap_write(es8326->regmap, ES8326_VMIDSEL, 0x0E);
+	regmap_write(es8326->regmap, ES8326_ANA_LP, 0xf0);
 	usleep_range(10000, 15000);
 	regmap_write(es8326->regmap, ES8326_HPJACK_TIMER, 0xe9);
-	regmap_write(es8326->regmap, ES8326_ANA_MICBIAS, 0x4b);
+	regmap_write(es8326->regmap, ES8326_ANA_MICBIAS, 0xcb);
 	/* set headphone default type and detect pin */
 	regmap_write(es8326->regmap, ES8326_HPDET_TYPE, 0x83);
 	regmap_write(es8326->regmap, ES8326_CLK_RESAMPLE, 0x05);
-	regmap_write(es8326->regmap, ES8326_HP_MISC, 0x30);
 
 	/* set internal oscillator as clock source of headpone cp */
 	regmap_write(es8326->regmap, ES8326_CLK_DIV_CPC, 0x89);
 	regmap_write(es8326->regmap, ES8326_CLK_CTL, ES8326_CLK_ON);
 	/* clock manager reset release */
 	regmap_write(es8326->regmap, ES8326_RESET, 0x17);
 	/* set headphone detection as half scan mode */
-	regmap_write(es8326->regmap, ES8326_HP_MISC, 0x30);
+	regmap_write(es8326->regmap, ES8326_HP_MISC, 0x3d);
 	regmap_write(es8326->regmap, ES8326_PULLUP_CTL, 0x00);
 
 	/* enable headphone driver */
+	regmap_write(es8326->regmap, ES8326_HP_VOL, 0xc4);
 	regmap_write(es8326->regmap, ES8326_HP_DRIVER, 0xa7);
 	usleep_range(2000, 5000);
-	regmap_write(es8326->regmap, ES8326_HP_DRIVER_REF, 0xa3);
-	regmap_write(es8326->regmap, ES8326_HP_DRIVER_REF, 0xb3);
+	regmap_write(es8326->regmap, ES8326_HP_DRIVER_REF, 0x23);
+	regmap_write(es8326->regmap, ES8326_HP_DRIVER_REF, 0x33);
 	regmap_write(es8326->regmap, ES8326_HP_DRIVER, 0xa1);
 
 	regmap_write(es8326->regmap, ES8326_CLK_INV, 0x00);
@@ -946,7 +951,7 @@ static int es8326_resume(struct snd_soc_component *component)
 		    (ES8326_IO_DMIC_CLK << ES8326_SDINOUT1_SHIFT));
 	regmap_write(es8326->regmap, ES8326_SDINOUT23_IO, ES8326_IO_INPUT);
 
-	regmap_write(es8326->regmap, ES8326_ANA_PDN, 0x3b);
+	regmap_write(es8326->regmap, ES8326_ANA_PDN, 0x00);
 	regmap_write(es8326->regmap, ES8326_RESET, ES8326_CSM_ON);
 	regmap_update_bits(es8326->regmap, ES8326_PGAGAIN, ES8326_MIC_SEL_MASK,
 			   ES8326_MIC1_SEL);

sound/soc/codecs/es8326.h

@@ -101,7 +101,7 @@
 #define ES8326_MUTE (3 << 0)
 
 /* ES8326_CLK_CTL */
-#define ES8326_CLK_ON (0x7f << 0)
+#define ES8326_CLK_ON (0x7e << 0)
 #define ES8326_CLK_OFF (0 << 0)
 
 /* ES8326_CLK_INV */