ASoC: intel: add support for specifying PCM format

With this machines can configure the PCM format applied on SSP port using
the set_fmt API

Signed-off-by: Praveen Diwakar <praveen.diwakar@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 99 insertions, 0 deletions

diff --git a/sound/soc/intel/atom/sst-atom-controls.c b/sound/soc/intel/atom/sst-atom-controls.c
index 93c6c8b5fbc6..e024d98948fa 100644
--- a/sound/soc/intel/atom/sst-atom-controls.c
+++ b/sound/soc/intel/atom/sst-atom-controls.c
@@ -774,8 +774,107 @@ int sst_handle_vb_timer(struct snd_soc_dai *dai, bool enable)
 	return ret;
 }
 
+static int sst_get_frame_sync_polarity(struct snd_soc_dai *dai,
+		unsigned int fmt)
+{
+	int format;
+
+	format = fmt & SND_SOC_DAIFMT_INV_MASK;
+	dev_dbg(dai->dev, "Enter:%s, format=%x\n", __func__, format);
+
+	switch (format) {
+	case SND_SOC_DAIFMT_NB_NF:
+		return SSP_FS_ACTIVE_LOW;
+	case SND_SOC_DAIFMT_NB_IF:
+		return SSP_FS_ACTIVE_HIGH;
+	case SND_SOC_DAIFMT_IB_IF:
+		return SSP_FS_ACTIVE_LOW;
+	case SND_SOC_DAIFMT_IB_NF:
+		return SSP_FS_ACTIVE_HIGH;
+	default:
+		dev_err(dai->dev, "Invalid frame sync polarity %d\n", format);
+	}
+
+	return -EINVAL;
+}
+
+static int sst_get_ssp_mode(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	int format;
+
+	format = (fmt & SND_SOC_DAIFMT_MASTER_MASK);
+	dev_dbg(dai->dev, "Enter:%s, format=%x\n", __func__, format);
+
+	switch (format) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		return SSP_MODE_MASTER;
+	case SND_SOC_DAIFMT_CBM_CFM:
+		return SSP_MODE_SLAVE;
+	default:
+		dev_err(dai->dev, "Invalid ssp protocol: %d\n", format);
+	}
+
+	return -EINVAL;
+}
+
+
+int sst_fill_ssp_config(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	unsigned int mode;
+	int fs_polarity;
+	struct sst_data *ctx = snd_soc_dai_get_drvdata(dai);
+
+	mode = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
+
+	switch (mode) {
+	case SND_SOC_DAIFMT_DSP_B:
+		ctx->ssp_cmd.ssp_protocol = SSP_MODE_PCM;
+		ctx->ssp_cmd.mode = sst_get_ssp_mode(dai, fmt) | (SSP_PCM_MODE_NETWORK << 1);
+		ctx->ssp_cmd.start_delay = 0;
+		ctx->ssp_cmd.data_polarity = 1;
+		ctx->ssp_cmd.frame_sync_width = 1;
+		break;
+
+	case SND_SOC_DAIFMT_DSP_A:
+		ctx->ssp_cmd.ssp_protocol = SSP_MODE_PCM;
+		ctx->ssp_cmd.mode = sst_get_ssp_mode(dai, fmt) | (SSP_PCM_MODE_NETWORK << 1);
+		ctx->ssp_cmd.start_delay = 1;
+		ctx->ssp_cmd.data_polarity = 1;
+		ctx->ssp_cmd.frame_sync_width = 1;
+		break;
+
+	case SND_SOC_DAIFMT_I2S:
+		ctx->ssp_cmd.ssp_protocol = SSP_MODE_I2S;
+		ctx->ssp_cmd.mode = sst_get_ssp_mode(dai, fmt) | (SSP_PCM_MODE_NORMAL << 1);
+		ctx->ssp_cmd.start_delay = 1;
+		ctx->ssp_cmd.data_polarity = 0;
+		ctx->ssp_cmd.frame_sync_width = ctx->ssp_cmd.nb_bits_per_slots;
+		break;
+
+	case SND_SOC_DAIFMT_LEFT_J:
+		ctx->ssp_cmd.ssp_protocol = SSP_MODE_I2S;
+		ctx->ssp_cmd.mode = sst_get_ssp_mode(dai, fmt) | (SSP_PCM_MODE_NORMAL << 1);
+		ctx->ssp_cmd.start_delay = 0;
+		ctx->ssp_cmd.data_polarity = 0;
+		ctx->ssp_cmd.frame_sync_width = ctx->ssp_cmd.nb_bits_per_slots;
+		break;
+
+	default:
+		dev_dbg(dai->dev, "using default ssp configs\n");
+	}
+
+	fs_polarity = sst_get_frame_sync_polarity(dai, fmt);
+	if (fs_polarity < 0)
+		return fs_polarity;
+
+	ctx->ssp_cmd.frame_sync_polarity = fs_polarity;
+
+	return 0;
+}
+
 /**
  * sst_ssp_config - contains SSP configuration for media UC
+ * this can be overwritten by set_dai_xxx APIs
  */
 static const struct sst_ssp_config sst_ssp_configs = {
 	.ssp_id = SSP_CODEC,