Support Tegra I2S client format conversion

Merge series from Sameer Pujar <spujar@nvidia.com>:

The AHUB HW modules are interconnected with CIF which are capable of
supporting Channel and Sample bit format conversion. Due to this, the
I2S Client can have different Channel and Sample bit from the hw_params()
and this config is passed from CIF port of I2S DT node which can help to
perform this conversion.

- First change to split simple_fixup_sample_fmt to support returning
  sample format value
- Second patch to support Tegra I2S client channel and sample format
  programming based on CIF port from DT node.

include/sound/simple_card_utils.h

@@ -174,6 +174,8 @@ void simple_util_parse_convert(struct device_node *np, char *prefix,
 			       struct simple_util_data *data);
 bool simple_util_is_convert_required(const struct simple_util_data *data);
 
+int simple_util_get_sample_fmt(struct simple_util_data *data);
+
 int simple_util_parse_routing(struct snd_soc_card *card,
 				      char *prefix);
 int simple_util_parse_widgets(struct snd_soc_card *card,

sound/soc/generic/simple-card-utils.c

@@ -13,12 +13,11 @@
 #include <sound/pcm_params.h>
 #include <sound/simple_card_utils.h>
 
-static void simple_fixup_sample_fmt(struct simple_util_data *data,
-					 struct snd_pcm_hw_params *params)
+int simple_util_get_sample_fmt(struct simple_util_data *data)
 {
 	int i;
-	struct snd_mask *mask = hw_param_mask(params,
-					      SNDRV_PCM_HW_PARAM_FORMAT);
+	int val = -EINVAL;
+
 	struct {
 		char *fmt;
 		u32 val;
@@ -33,11 +32,26 @@ static void simple_fixup_sample_fmt(struct simple_util_data *data,
 	for (i = 0; i < ARRAY_SIZE(of_sample_fmt_table); i++) {
 		if (!strcmp(data->convert_sample_format,
 			    of_sample_fmt_table[i].fmt)) {
-			snd_mask_none(mask);
-			snd_mask_set(mask, of_sample_fmt_table[i].val);
+			val = of_sample_fmt_table[i].val;
 			break;
 		}
 	}
+	return val;
+}
+EXPORT_SYMBOL_GPL(simple_util_get_sample_fmt);
+
+static void simple_fixup_sample_fmt(struct simple_util_data *data,
+				    struct snd_pcm_hw_params *params)
+{
+	int val;
+	struct snd_mask *mask = hw_param_mask(params,
+					      SNDRV_PCM_HW_PARAM_FORMAT);
+
+	val = simple_util_get_sample_fmt(data);
+	if (val >= 0) {
+		snd_mask_none(mask);
+		snd_mask_set(mask, val);
+	}
 }
 
 void simple_util_parse_convert(struct device_node *np,

sound/soc/tegra/tegra210_i2s.c

@@ -8,11 +8,13 @@
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
+#include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <sound/core.h>
 #include <sound/pcm_params.h>
+#include <sound/simple_card_utils.h>
 #include <sound/soc.h>
 #include "tegra210_i2s.h"
 #include "tegra_cif.h"
@@ -603,6 +605,7 @@ static int tegra210_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct tegra210_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	unsigned int sample_size, channels, srate, val, reg, path;
 	struct tegra_cif_conf cif_conf;
+	snd_pcm_format_t sample_format;
 
 	memset(&cif_conf, 0, sizeof(struct tegra_cif_conf));
 
@@ -615,28 +618,51 @@ static int tegra210_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	cif_conf.audio_ch = channels;
 	cif_conf.client_ch = channels;
+	if (i2s->client_channels)
+		cif_conf.client_ch = i2s->client_channels;
 
+	/* AHUB CIF Audio bits configs */
 	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S8:
+		cif_conf.audio_bits = TEGRA_ACIF_BITS_8;
+		break;
+	case SNDRV_PCM_FORMAT_S16_LE:
+		cif_conf.audio_bits = TEGRA_ACIF_BITS_16;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		cif_conf.audio_bits = TEGRA_ACIF_BITS_32;
+		break;
+	default:
+		dev_err(dev, "unsupported params audio bit format!\n");
+		return -EOPNOTSUPP;
+	}
+
+	sample_format = params_format(params);
+	if (i2s->client_sample_format >= 0)
+		sample_format = (snd_pcm_format_t)i2s->client_sample_format;
+
+	/*
+	 * Format of the I2S for sending/receiving the audio
+	 * to/from external device.
+	 */
+	switch (sample_format) {
 	case SNDRV_PCM_FORMAT_S8:
 		val = I2S_BITS_8;
 		sample_size = 8;
-		cif_conf.audio_bits = TEGRA_ACIF_BITS_8;
 		cif_conf.client_bits = TEGRA_ACIF_BITS_8;
 		break;
 	case SNDRV_PCM_FORMAT_S16_LE:
 		val = I2S_BITS_16;
 		sample_size = 16;
-		cif_conf.audio_bits = TEGRA_ACIF_BITS_16;
 		cif_conf.client_bits = TEGRA_ACIF_BITS_16;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		val = I2S_BITS_32;
 		sample_size = 32;
-		cif_conf.audio_bits = TEGRA_ACIF_BITS_32;
 		cif_conf.client_bits = TEGRA_ACIF_BITS_32;
 		break;
 	default:
-		dev_err(dev, "unsupported format!\n");
+		dev_err(dev, "unsupported client bit format!\n");
 		return -EOPNOTSUPP;
 	}
 
@@ -872,6 +898,40 @@ static const struct regmap_config tegra210_i2s_regmap_config = {
 	.cache_type		= REGCACHE_FLAT,
 };
 
+/*
+ * The AHUB HW modules are interconnected with CIF which are capable of
+ * supporting Channel and Sample bit format conversion. This needs different
+ * CIF Audio and client configuration. As one of the config comes from
+ * params_channels() or params_format(), the extra configuration is passed from
+ * CIF Port of DT I2S node which can help to perform this conversion.
+ *
+ *    4ch          audio = 4ch      client = 2ch       2ch
+ *   -----> ADMAIF -----------> CIF -------------> I2S ---->
+ */
+static void tegra210_parse_client_convert(struct device *dev)
+{
+	struct tegra210_i2s *i2s = dev_get_drvdata(dev);
+	struct device_node *ports, *ep;
+	struct simple_util_data data = {};
+	int cif_port = 0;
+
+	ports = of_get_child_by_name(dev->of_node, "ports");
+	if (ports) {
+		ep = of_graph_get_endpoint_by_regs(ports, cif_port, -1);
+		if (ep) {
+			simple_util_parse_convert(ep, NULL, &data);
+			of_node_put(ep);
+		}
+		of_node_put(ports);
+	}
+
+	if (data.convert_channels)
+		i2s->client_channels = data.convert_channels;
+
+	if (data.convert_sample_format)
+		i2s->client_sample_format = simple_util_get_sample_fmt(&data);
+}
+
 static int tegra210_i2s_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -887,6 +947,7 @@ static int tegra210_i2s_probe(struct platform_device *pdev)
 	i2s->tx_mask = DEFAULT_I2S_SLOT_MASK;
 	i2s->rx_mask = DEFAULT_I2S_SLOT_MASK;
 	i2s->loopback = false;
+	i2s->client_sample_format = -EINVAL;
 
 	dev_set_drvdata(dev, i2s);
 
@@ -916,6 +977,8 @@ static int tegra210_i2s_probe(struct platform_device *pdev)
 		return PTR_ERR(i2s->regmap);
 	}
 
+	tegra210_parse_client_convert(dev);
+
 	regcache_cache_only(i2s->regmap, true);
 
 	err = devm_snd_soc_register_component(dev, &tegra210_i2s_cmpnt,

sound/soc/tegra/tegra210_i2s.h

@@ -112,6 +112,8 @@ struct tegra210_i2s {
 	struct clk *clk_i2s;
 	struct clk *clk_sync_input;
 	struct regmap *regmap;
+	int client_sample_format;
+	unsigned int client_channels;
 	unsigned int stereo_to_mono[I2S_PATHS];
 	unsigned int mono_to_stereo[I2S_PATHS];
 	unsigned int dai_fmt;