ASoC: cs42l42: Allow time for HP/ADC to power-up after enable

After enabling the HP or ADC by writing the corresponding PDN=0,
it takes around 20 milliseconds for it to power up and the midrail
supply to be stable. Add this wait into a DAPM widget callback.

If HP and ADC are both powering up in a DAPM sequence, there's no
need to do the wait twice. The widget will perform one wait in the
POST_PMU if there was a PRE_PMU for one or both.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211015133619.4698-13-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 4ec7fdc..d6d74a7 100644 (file)
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -435,10 +435,36 @@ static const struct snd_kcontrol_new cs42l42_snd_controls[] = {
                                0x3f, 1, mixer_tlv)
 };
 
+static int cs42l42_hp_adc_ev(struct snd_soc_dapm_widget *w,
+                            struct snd_kcontrol *kcontrol, int event)
+{
+       struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+       struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component);
+
+       switch (event) {
+       case SND_SOC_DAPM_PRE_PMU:
+               cs42l42->hp_adc_up_pending = true;
+               break;
+       case SND_SOC_DAPM_POST_PMU:
+               /* Only need one delay if HP and ADC are both powering-up */
+               if (cs42l42->hp_adc_up_pending) {
+                       usleep_range(CS42L42_HP_ADC_EN_TIME_US,
+                                    CS42L42_HP_ADC_EN_TIME_US + 1000);
+                       cs42l42->hp_adc_up_pending = false;
+               }
+               break;
+       default:
+               break;
+       }
+
+       return 0;
+}
+
 static const struct snd_soc_dapm_widget cs42l42_dapm_widgets[] = {
        /* Playback Path */
        SND_SOC_DAPM_OUTPUT("HP"),
-       SND_SOC_DAPM_DAC("DAC", NULL, CS42L42_PWR_CTL1, CS42L42_HP_PDN_SHIFT, 1),
+       SND_SOC_DAPM_DAC_E("DAC", NULL, CS42L42_PWR_CTL1, CS42L42_HP_PDN_SHIFT, 1,
+                          cs42l42_hp_adc_ev, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU),
        SND_SOC_DAPM_MIXER("MIXER", CS42L42_PWR_CTL1, CS42L42_MIXER_PDN_SHIFT, 1, NULL, 0),
        SND_SOC_DAPM_AIF_IN("SDIN1", NULL, 0, SND_SOC_NOPM, 0, 0),
        SND_SOC_DAPM_AIF_IN("SDIN2", NULL, 1, SND_SOC_NOPM, 0, 0),
@@ -448,7 +474,8 @@ static const struct snd_soc_dapm_widget cs42l42_dapm_widgets[] = {
 
        /* Capture Path */
        SND_SOC_DAPM_INPUT("HS"),
-       SND_SOC_DAPM_ADC("ADC", NULL, CS42L42_PWR_CTL1, CS42L42_ADC_PDN_SHIFT, 1),
+       SND_SOC_DAPM_ADC_E("ADC", NULL, CS42L42_PWR_CTL1, CS42L42_ADC_PDN_SHIFT, 1,
+                          cs42l42_hp_adc_ev, SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU),
        SND_SOC_DAPM_AIF_OUT("SDOUT1", NULL, 0, CS42L42_ASP_TX_CH_EN, CS42L42_ASP_TX0_CH1_SHIFT, 0),
        SND_SOC_DAPM_AIF_OUT("SDOUT2", NULL, 1, CS42L42_ASP_TX_CH_EN, CS42L42_ASP_TX0_CH2_SHIFT, 0),
 

diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index 8734f68..ded61af 100644 (file)
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -761,6 +761,7 @@
 #define CS42L42_CLOCK_SWITCH_DELAY_US 150
 #define CS42L42_PLL_LOCK_POLL_US       250
 #define CS42L42_PLL_LOCK_TIMEOUT_US    1250
+#define CS42L42_HP_ADC_EN_TIME_US      20000
 
 static const char *const cs42l42_supply_names[CS42L42_NUM_SUPPLIES] = {
        "VA",
@@ -794,6 +795,7 @@ struct  cs42l42_private {
        u8 hs_bias_ramp_time;
        u8 hs_bias_sense_en;
        u8 stream_use;
+       bool hp_adc_up_pending;
 };
 
 #endif /* __CS42L42_H__ */