ASoC: Intel: Boards: tgl_max98373: add dai_trigger function

Speaker amplifier feedback is not modeled as being dependent on any
active output. Even when there is no playback happening, parts of the graph,
specifically the IV sense->speaker protection->output remains active and
this prevents the DSP from entering low-power states.

This patch suggest a machine driver level approach where the speaker
pins are enabled/disabled dynamically depending on stream start/stop
events. DPAM graph representations show the feedback loop is indeed
disabled and low-power states can be reached.

Change-Id: I3c34487ec18fc20efe0da678402946b93313d391
Signed-off-by: Dharageswari R <dharageswari.r@inetl.com>

Author: Dharageswari R

sound/soc/intel/boards/sof_maxim_common.c

@@ -57,8 +57,47 @@ static int max98373_hw_params(struct snd_pcm_substream *substream,
 	return 0;
 }
 
+static int max98373_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai;
+	int j, ret = 0;
+	char *pin_name;
+
+	for_each_rtd_codec_dais(rtd, j, codec_dai) {
+		struct snd_soc_component *component = codec_dai->component;
+		struct snd_soc_dapm_context *dapm =
+				snd_soc_component_get_dapm(component);
+
+		pin_name = devm_kasprintf(rtd->dev, GFP_KERNEL, "%s Spk",
+					codec_dai->component->name_prefix);
+
+		switch (cmd) {
+		case SNDRV_PCM_TRIGGER_START:
+		case SNDRV_PCM_TRIGGER_RESUME:
+		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+			ret = snd_soc_dapm_enable_pin(dapm, pin_name);
+			if (!ret)
+				snd_soc_dapm_sync(dapm);
+			break;
+		case SNDRV_PCM_TRIGGER_STOP:
+		case SNDRV_PCM_TRIGGER_SUSPEND:
+		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+			if (codec_dai->active != 1)
+				break;
+			ret = snd_soc_dapm_disable_pin(dapm, pin_name);
+			if (!ret)
+				snd_soc_dapm_sync(dapm);
+			break;
+		}
+	}
+
+	return ret;
+}
+
 struct snd_soc_ops max_98373_ops = {
 	.hw_params = max98373_hw_params,
+	.trigger = max98373_trigger,
 };
 
 int max98373_spk_codec_init(struct snd_soc_pcm_runtime *rtd)

sound/soc/intel/boards/sof_rt5682.c

@@ -311,6 +311,7 @@ static int sof_card_late_probe(struct snd_soc_card *card)
 {
 	struct sof_card_private *ctx = snd_soc_card_get_drvdata(card);
 	struct snd_soc_component *component = NULL;
+	struct snd_soc_dapm_context *dapm = &card->dapm;
 	char jack_name[NAME_SIZE];
 	struct sof_hdmi_pcm *pcm;
 	int err;
@@ -349,6 +350,11 @@ static int sof_card_late_probe(struct snd_soc_card *card)
 		i++;
 	}
 
+	if (sof_rt5682_quirk & SOF_MAX98373_SPEAKER_AMP_PRESENT) {
+		snd_soc_dapm_disable_pin(dapm, "Left Spk");
+		snd_soc_dapm_disable_pin(dapm, "Right Spk");
+		return snd_soc_dapm_sync(dapm);
+	}
 	return hdac_hdmi_jack_port_init(component, &card->dapm);
 }