[PATCH v4 06/10] ASoC: tas2764: Crop SDOUT zero-out mask based on BCLK ratio

[James Calligeros <jcalligeros99@gmail.com>]

From: Martin Povišer <povik+lin@cutebit.org>

As per the datasheet, SDOUT bits must be zeroed out if the
corresponding TDM slot is invalid for a given clock ratio.

Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Signed-off-by: James Calligeros <jcalligeros99@gmail.com>
---
 sound/soc/codecs/tas2764.c | 39 +++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/sound/soc/codecs/tas2764.c b/sound/soc/codecs/tas2764.c
index fbfe4d032df7b26b7db0f7c7dcb47661277006d0..e291ec0951d49ee902589df16c4db96e83614e66 100644
--- a/sound/soc/codecs/tas2764.c
+++ b/sound/soc/codecs/tas2764.c
@@ -367,6 +367,44 @@ static int tas2764_hw_params(struct snd_pcm_substream *substream,
 	return tas2764_set_samplerate(tas2764, params_rate(params));
 }
 
+static int tas2764_write_sdout_zero_mask(struct tas2764_priv *tas2764, int bclk_ratio)
+{
+	struct snd_soc_component *component = tas2764->component;
+	int nsense_slots = bclk_ratio / 8;
+	u32 cropped_mask;
+	int i, ret;
+
+	if (!tas2764->sdout_zero_mask)
+		return 0;
+
+	cropped_mask = tas2764->sdout_zero_mask & GENMASK(nsense_slots - 1, 0);
+
+	for (i = 0; i < 4; i++) {
+		ret = snd_soc_component_write(component, TAS2764_SDOUT_HIZ_1 + i,
+					      (cropped_mask >> (i * 8)) & 0xff);
+
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = snd_soc_component_update_bits(component, TAS2764_SDOUT_HIZ_9,
+					    TAS2764_SDOUT_HIZ_9_FORCE_0_EN,
+					    TAS2764_SDOUT_HIZ_9_FORCE_0_EN);
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int tas2764_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
+{
+	struct snd_soc_component *component = dai->component;
+	struct tas2764_priv *tas2764 = snd_soc_component_get_drvdata(component);
+
+	return tas2764_write_sdout_zero_mask(tas2764, ratio);
+}
+
 static int tas2764_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = dai->component;
@@ -506,6 +544,7 @@ static int tas2764_set_dai_tdm_slot(struct snd_soc_dai *dai,
 static const struct snd_soc_dai_ops tas2764_dai_ops = {
 	.mute_stream = tas2764_mute,
 	.hw_params  = tas2764_hw_params,
+	.set_bclk_ratio = tas2764_set_bclk_ratio,
 	.set_fmt    = tas2764_set_fmt,
 	.set_tdm_slot = tas2764_set_dai_tdm_slot,
 	.no_capture_mute = 1,

-- 
2.49.0