linux-kernel - [PATCH v4 5/9] ASoC: sun4i-i2s: Add set_tdm

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Date:   Mon,  3 Jun 2019 19:47:31 +0200
From:   codekipper@...il.com
To:     maxime.ripard@...e-electrons.com, wens@...e.org,
        linux-sunxi@...glegroups.com
Cc:     linux-arm-kernel@...ts.infradead.org, lgirdwood@...il.com,
        broonie@...nel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, be17068@...rbole.bo.it,
        Marcus Cooper <codekipper@...il.com>
Subject: [PATCH v4 5/9] ASoC: sun4i-i2s: Add set_tdm_slot functionality

From: Marcus Cooper <codekipper@...il.com>

Some codecs require a different amount of a bit clocks per frame than
what is calculated by the sample width. Use the tdm slot bindings to
provide this mechanism.

Signed-off-by: Marcus Cooper <codekipper@...il.com>
---
 sound/soc/sunxi/sun4i-i2s.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 329883750d6f..bca73b3c0d74 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -186,6 +186,9 @@ struct sun4i_i2s {
 	struct regmap_field	*field_rxchansel;
 
 	const struct sun4i_i2s_quirks	*variant;
+
+	unsigned int	tdm_slots;
+	unsigned int	slot_width;
 };
 
 struct sun4i_i2s_clk_div {
@@ -337,7 +340,7 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
 	if (i2s->variant->is_h3_i2s_based)
 		regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
 				   SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
-				   SUN8I_I2S_FMT0_LRCK_PERIOD(32));
+				   SUN8I_I2S_FMT0_LRCK_PERIOD(word_size));
 
 	/* Set sign extension to pad out LSB with 0 */
 	regmap_field_write(i2s->field_fmt_sext, 0);
@@ -414,7 +417,8 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
 			   sr + i2s->variant->fmt_offset);
 
 	return sun4i_i2s_set_clk_rate(dai, params_rate(params),
-				      params_width(params));
+				      i2s->tdm_slots ?
+				      i2s->slot_width : params_width(params));
 }
 
 static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
@@ -657,11 +661,25 @@ static int sun4i_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 	return 0;
 }
 
+static int sun4i_i2s_set_dai_tdm_slot(struct snd_soc_dai *dai,
+	unsigned int tx_mask, unsigned int rx_mask,
+	int slots, int width)
+{
+	struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+	i2s->tdm_slots = slots;
+
+	i2s->slot_width = width;
+
+	return 0;
+}
+
 static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
 	.hw_params	= sun4i_i2s_hw_params,
 	.set_fmt	= sun4i_i2s_set_fmt,
 	.set_sysclk	= sun4i_i2s_set_sysclk,
 	.trigger	= sun4i_i2s_trigger,
+	.set_tdm_slot	= sun4i_i2s_set_dai_tdm_slot,
 };
 
 static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
-- 
2.21.0