[alsa-devel] [PATCH v3 1/7] ASoC: tegra: add a TDM configuration callback

[Ben Dooks]

From: Edward Cragg <edward.cragg at codethink.co.uk>

Add a callback to configure TDM settings for the Tegra30 I2S ASoC 'platform'
driver.

Signed-off-by: Edward Cragg <edward.cragg at codethink.co.uk>
[ben.dooks at codethink.co.uk: merge fix for power management]
[ben.dooks at codethink.co.uk: add review change for fsync of 1 clock]
Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
---
 sound/soc/tegra/tegra30_i2s.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
index ac6983c6bd72..7f9ef6abeae2 100644
--- a/sound/soc/tegra/tegra30_i2s.c
+++ b/sound/soc/tegra/tegra30_i2s.c
@@ -254,6 +254,38 @@ static int tegra30_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	return 0;
 }
 
+/*
+ * Set up TDM
+ */
+static int tegra30_i2s_set_tdm(struct snd_soc_dai *dai,
+			       unsigned int tx_mask, unsigned int rx_mask,
+			       int slots, int slot_width)
+{
+	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+	unsigned int mask, val;
+
+	dev_dbg(dai->dev, "%s: txmask=0x%08x rxmask=0x%08x slots=%d width=%d\n",
+		 __func__, tx_mask, rx_mask, slots, slot_width);
+
+	/* Set up slots and tx/rx masks */
+	mask = TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_MASK |
+	       TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_MASK |
+	       TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_MASK;
+
+	val = (tx_mask << TEGRA30_I2S_SLOT_CTRL_TX_SLOT_ENABLES_SHIFT) |
+	      (rx_mask << TEGRA30_I2S_SLOT_CTRL_RX_SLOT_ENABLES_SHIFT) |
+	      ((slots - 1) << TEGRA30_I2S_SLOT_CTRL_TOTAL_SLOTS_SHIFT);
+
+	pm_runtime_get_sync(dai->dev);
+	regmap_update_bits(i2s->regmap, TEGRA30_I2S_SLOT_CTRL, mask, val);
+	// set the fsync width to minimum of 1 clock width
+	regmap_update_bits(i2s->regmap, TEGRA30_I2S_CH_CTRL,
+			   TEGRA30_I2S_CH_CTRL_FSYNC_WIDTH_MASK, 0x0);
+	pm_runtime_put(dai->dev);
+
+	return 0;
+}
+
 static int tegra30_i2s_probe(struct snd_soc_dai *dai)
 {
 	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(dai);
@@ -268,6 +300,7 @@ static const struct snd_soc_dai_ops tegra30_i2s_dai_ops = {
 	.set_fmt	= tegra30_i2s_set_fmt,
 	.hw_params	= tegra30_i2s_hw_params,
 	.trigger	= tegra30_i2s_trigger,
+	.set_tdm_slot	= tegra30_i2s_set_tdm,
 };
 
 static const struct snd_soc_dai_driver tegra30_i2s_dai_template = {
-- 
2.23.0