[PATCH 2/2] ASoC: amd: acp: es83xx: Enable amplifiers after the codec output

[Samuel Leyva <samuelslg03idk@gmail.com>]

The speaker and headphone amplifier GPIOs are driven from SUPPLY
widgets. DAPM powers supplies before the rest of the path, so the
amplifiers are enabled while the ES8316 headphone driver and charge
pump are still powering up, which results in an audible pop every
time the output is powered on.

Move the GPIO handling to the Speaker and Headphone endpoint widgets,
which DAPM powers up last and powers down first, and give the codec
output a short time to settle before enabling the amplifier.

Tested on a Huawei MateBook D 14 (NBM-WXX9).

Signed-off-by: Samuel Leyva <samuelslg03idk@gmail.com>
---
 sound/soc/amd/acp/acp3x-es83xx/acp3x-es83xx.c | 26 +++++++++----------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/sound/soc/amd/acp/acp3x-es83xx/acp3x-es83xx.c b/sound/soc/amd/acp/acp3x-es83xx/acp3x-es83xx.c
index fb675774f..0a05f1f08 100644
--- a/sound/soc/amd/acp/acp3x-es83xx/acp3x-es83xx.c
+++ b/sound/soc/amd/acp/acp3x-es83xx/acp3x-es83xx.c
@@ -18,6 +18,7 @@
 #include <linux/input.h>
 #include <linux/io.h>
 #include <linux/acpi.h>
+#include <linux/delay.h>
 #include <linux/dmi.h>
 #include <linux/string_choices.h>
 #include "../acp-mach.h"
@@ -60,6 +61,8 @@ static const struct snd_pcm_hw_constraint_list constraints_channels = {
 #define ES83xx_12288_KHZ_MCLK_FREQ   (48000 * 256)
 #define ES83xx_48_MHZ_MCLK_FREQ      (48000 * 1000)
 
+#define ES83XX_AMP_ON_DELAY_MS	50
+
 static int acp3x_es83xx_headphone_power_event(struct snd_soc_dapm_widget *w,
 					    struct snd_kcontrol *kcontrol, int event);
 static int acp3x_es83xx_speaker_power_event(struct snd_soc_dapm_widget *w,
@@ -114,23 +117,15 @@ static struct snd_soc_jack_pin es83xx_jack_pins[] = {
 };
 
 static const struct snd_soc_dapm_widget acp3x_es83xx_widgets[] = {
-	SND_SOC_DAPM_SPK("Speaker", NULL),
-	SND_SOC_DAPM_HP("Headphone", NULL),
+	SND_SOC_DAPM_SPK("Speaker", acp3x_es83xx_speaker_power_event),
+	SND_SOC_DAPM_HP("Headphone", acp3x_es83xx_headphone_power_event),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
 	SND_SOC_DAPM_MIC("Internal Mic", NULL),
-
-	SND_SOC_DAPM_SUPPLY("Headphone Power", SND_SOC_NOPM, 0, 0,
-			    acp3x_es83xx_headphone_power_event,
-			    SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMU),
-	SND_SOC_DAPM_SUPPLY("Speaker Power", SND_SOC_NOPM, 0, 0,
-			    acp3x_es83xx_speaker_power_event,
-			    SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMU),
 };
 
 static const struct snd_soc_dapm_route acp3x_es83xx_audio_map[] = {
 	{"Headphone", NULL, "HPOL"},
 	{"Headphone", NULL, "HPOR"},
-	{"Headphone", NULL, "Headphone Power"},
 
 	/*
 	 * There is no separate speaker output instead the speakers are muxed to
@@ -138,7 +133,6 @@ static const struct snd_soc_dapm_route acp3x_es83xx_audio_map[] = {
 	 */
 	{"Speaker", NULL, "HPOL"},
 	{"Speaker", NULL, "HPOR"},
-	{"Speaker", NULL, "Speaker Power"},
 };
 
 
@@ -168,8 +162,11 @@ static int acp3x_es83xx_headphone_power_event(struct snd_soc_dapm_widget *w,
 	struct acp3x_es83xx_private *priv = get_mach_priv(card);
 
 	dev_dbg(priv->codec_dev, "headphone power event = %d\n", event);
-	if (SND_SOC_DAPM_EVENT_ON(event))
+	if (SND_SOC_DAPM_EVENT_ON(event)) {
+		/* Let the codec output settle before enabling the amplifier */
+		msleep(ES83XX_AMP_ON_DELAY_MS);
 		priv->headphone_on = true;
+	}
 	else
 		priv->headphone_on = false;
 
@@ -186,8 +183,11 @@ static int acp3x_es83xx_speaker_power_event(struct snd_soc_dapm_widget *w,
 	struct acp3x_es83xx_private *priv = get_mach_priv(card);
 
 	dev_dbg(priv->codec_dev, "speaker power event: %d\n", event);
-	if (SND_SOC_DAPM_EVENT_ON(event))
+	if (SND_SOC_DAPM_EVENT_ON(event)) {
+		/* Let the codec output settle before enabling the amplifier */
+		msleep(ES83XX_AMP_ON_DELAY_MS);
 		priv->speaker_on = true;
+	}
 	else
 		priv->speaker_on = false;
 
-- 
2.56.0