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Subject[PATCH v5 13/15] ASoC: sun4i-i2s: Add multichannel functionality
Date
From: Marcus Cooper <codekipper@gmail.com>

The i2s block can be used to pass PCM data over multiple channels
and is sometimes used for the audio side of an HDMI connection.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
sound/soc/sunxi/sun4i-i2s.c | 93 +++++++++++++++++++++++++------------
1 file changed, 63 insertions(+), 30 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index a020c3b372a8..a71969167053 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -617,41 +617,74 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
int lines;

channels = params_channels(params);
- if (channels != 2) {
- dev_err(dai->dev, "Unsupported number of channels: %d\n",
- channels);
- return -EINVAL;
- }
-
- lines = (channels + 1) / 2;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if ((channels > dai->driver->playback.channels_max) ||
+ (channels < dai->driver->playback.channels_min)) {
+ dev_err(dai->dev, "Unsupported number of channels: %d\n",
+ channels);
+ return -EINVAL;
+ }

- /* Enable the required output lines */
- regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
- SUN4I_I2S_CTRL_SDO_EN_MASK,
- SUN4I_I2S_CTRL_SDO_EN(lines));
-
- if (i2s->variant->has_chcfg) {
- regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
- SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM_MASK,
- SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM(channels));
- regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
- SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM_MASK,
- SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM(channels));
- }
+ lines = (channels + 1) / 2;

- /* Map the channels for playback and capture */
- i2s->variant->set_txchanmap(i2s, 0, 0x76543210);
- i2s->variant->set_rxchanmap(i2s, 0x00003210);
+ /* Enable the required output lines */
+ regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
+ SUN4I_I2S_CTRL_SDO_EN_MASK,
+ SUN4I_I2S_CTRL_SDO_EN(lines));
+
+ i2s->variant->set_txchanmap(i2s, 0, 0x10);
+ i2s->variant->set_txchansel(i2s, 0, channels > 1 ? 2:1);
+
+ if (i2s->variant->set_txchanen)
+ i2s->variant->set_txchanen(i2s, 0, 2);
+
+ if (i2s->variant->has_chcfg) {
+ regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
+ SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM_MASK,
+ SUN8I_I2S_CHAN_CFG_TX_SLOT_NUM(channels));
+
+ if (channels > 2) {
+ i2s->variant->set_txchanmap(i2s, 1, 0x32);
+ i2s->variant->set_txchanoffset(i2s, 1);
+ i2s->variant->set_txchansel(i2s, 1,
+ channels > 3 ? 2:1);
+ i2s->variant->set_txchanen(i2s, 1, 2);
+ }
+ if (channels > 4) {
+ i2s->variant->set_txchanmap(i2s, 2, 0x54);
+ i2s->variant->set_txchanoffset(i2s, 2);
+ i2s->variant->set_txchansel(i2s, 2,
+ channels > 5 ? 2:1);
+ i2s->variant->set_txchanen(i2s, 2, 2);
+ }
+ if (channels > 6) {
+ i2s->variant->set_txchanmap(i2s, 3, 0x76);
+ i2s->variant->set_txchanoffset(i2s, 3);
+ i2s->variant->set_txchansel(i2s, 3,
+ channels > 6 ? 2:1);
+ i2s->variant->set_txchanen(i2s, 3, 2);
+ }
+ }
+ } else {
+ if ((channels > dai->driver->capture.channels_max) ||
+ (channels < dai->driver->capture.channels_min)) {
+ dev_err(dai->dev, "Unsupported number of channels: %d\n",
+ channels);
+ return -EINVAL;
+ }

- /* Configure the channels */
- i2s->variant->set_txchansel(i2s, 0, channels);
- i2s->variant->set_rxchansel(i2s, channels);
+ /* Map the channels for capture */
+ i2s->variant->set_rxchanmap(i2s, 0x10);
+ i2s->variant->set_rxchansel(i2s, channels);

- if (i2s->variant->set_txchanen)
- i2s->variant->set_txchanen(i2s, 0, channels);
+ if (i2s->variant->set_rxchanen)
+ i2s->variant->set_rxchanen(i2s, channels);

- if (i2s->variant->set_rxchanen)
- i2s->variant->set_rxchanen(i2s, channels);
+ if (i2s->variant->has_chcfg)
+ regmap_update_bits(i2s->regmap, SUN8I_I2S_CHAN_CFG_REG,
+ SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM_MASK,
+ SUN8I_I2S_CHAN_CFG_RX_SLOT_NUM(channels));
+ }

switch (params_physical_width(params)) {
case 16:
--
2.22.0
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