ASoC: rt5682: enable SAR ADC power saving mode during suspend

The SAR ADC power saving mode could reduce power consumption on MICVDD rail.
Therefore, this patch saves power consumption during suspend state if the headset was connected.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20210727084846.9867-1-shumingf@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5682.c

@@ -2911,10 +2911,46 @@ static void rt5682_remove(struct snd_soc_component *component)
 static int rt5682_suspend(struct snd_soc_component *component)
 {
 	struct rt5682_priv *rt5682 = snd_soc_component_get_drvdata(component);
+	unsigned int val;
 
 	if (rt5682->is_sdw)
 		return 0;
 
+	cancel_delayed_work_sync(&rt5682->jack_detect_work);
+	cancel_delayed_work_sync(&rt5682->jd_check_work);
+	if (rt5682->hs_jack && rt5682->jack_type == SND_JACK_HEADSET) {
+		snd_soc_component_update_bits(component, RT5682_CBJ_CTRL_1,
+			RT5682_MB1_PATH_MASK | RT5682_MB2_PATH_MASK,
+			RT5682_CTRL_MB1_REG | RT5682_CTRL_MB2_REG);
+		val = snd_soc_component_read(component,
+				RT5682_CBJ_CTRL_2) & RT5682_JACK_TYPE_MASK;
+
+		switch (val) {
+		case 0x1:
+			snd_soc_component_update_bits(component, RT5682_SAR_IL_CMD_1,
+				RT5682_SAR_SEL_MB1_MASK | RT5682_SAR_SEL_MB2_MASK,
+				RT5682_SAR_SEL_MB1_NOSEL | RT5682_SAR_SEL_MB2_SEL);
+			break;
+		case 0x2:
+			snd_soc_component_update_bits(component, RT5682_SAR_IL_CMD_1,
+				RT5682_SAR_SEL_MB1_MASK | RT5682_SAR_SEL_MB2_MASK,
+				RT5682_SAR_SEL_MB1_SEL | RT5682_SAR_SEL_MB2_NOSEL);
+			break;
+		default:
+			break;
+		}
+
+		snd_soc_component_update_bits(component, RT5682_PWR_ANLG_3,
+			RT5682_PWR_CBJ, 0);
+
+		/* enter SAR ADC power saving mode */
+		snd_soc_component_update_bits(component, RT5682_SAR_IL_CMD_1,
+			RT5682_SAR_BUTT_DET_MASK | RT5682_SAR_BUTDET_MODE_MASK | RT5682_SAR_BUTDET_RST_MASK, 0);
+		snd_soc_component_update_bits(component, RT5682_SAR_IL_CMD_1,
+			RT5682_SAR_BUTT_DET_MASK | RT5682_SAR_BUTDET_MODE_MASK | RT5682_SAR_BUTDET_RST_MASK,
+			RT5682_SAR_BUTT_DET_EN | RT5682_SAR_BUTDET_POW_SAV | RT5682_SAR_BUTDET_RST_NORMAL);
+	}
+
 	regcache_cache_only(rt5682->regmap, true);
 	regcache_mark_dirty(rt5682->regmap);
 	return 0;
@@ -2930,6 +2966,14 @@ static int rt5682_resume(struct snd_soc_component *component)
 	regcache_cache_only(rt5682->regmap, false);
 	regcache_sync(rt5682->regmap);
 
+	if (rt5682->hs_jack && rt5682->jack_type == SND_JACK_HEADSET) {
+		snd_soc_component_update_bits(component, RT5682_CBJ_CTRL_1,
+			RT5682_MB1_PATH_MASK | RT5682_MB2_PATH_MASK,
+			RT5682_CTRL_MB1_FSM | RT5682_CTRL_MB2_FSM);
+		snd_soc_component_update_bits(component, RT5682_PWR_ANLG_3,
+			RT5682_PWR_CBJ, RT5682_PWR_CBJ);
+	}
+
 	mod_delayed_work(system_power_efficient_wq,
 		&rt5682->jack_detect_work, msecs_to_jiffies(250));