[alsa-devel] [PATCH v6 4/6] ASoC: amd: add ACP3x TDM mode support

[Ravulapati Vishnu vardhan rao]

ACP3x I2S (CPU DAI) can act in normal I2S and TDM modes. Added support
for TDM mode. Desired mode can be selected from ASoC machine driver.

Signed-off-by: Ravulapati Vishnu vardhan rao <Vishnuvardhanrao.Ravulapati at amd.com>
---
 sound/soc/amd/raven/acp3x-i2s.c | 42 +++++++++++++++++++++++++++++++----------
 sound/soc/amd/raven/acp3x.h     |  2 ++
 2 files changed, 34 insertions(+), 10 deletions(-)

diff --git a/sound/soc/amd/raven/acp3x-i2s.c b/sound/soc/amd/raven/acp3x-i2s.c
index 247b9f5..5cb4ef7 100644
--- a/sound/soc/amd/raven/acp3x-i2s.c
+++ b/sound/soc/amd/raven/acp3x-i2s.c
@@ -43,8 +43,8 @@ static int acp3x_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
 		u32 rx_mask, int slots, int slot_width)
 {
 	struct i2s_dev_data *adata;
-	u32 val;
 	u16 slot_len;
+	u32 val, flen, reg_val, frmt_reg;
 
 	adata = snd_soc_dai_get_drvdata(cpu_dai);
 
@@ -67,16 +67,38 @@ static int acp3x_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
 		return -EINVAL;
 	}
 
-	val = rv_readl(adata->acp3x_base + mmACP_BTTDM_ITER);
-	rv_writel(val | 0x2, adata->acp3x_base + mmACP_BTTDM_ITER);
-	val = rv_readl(adata->acp3x_base + mmACP_BTTDM_IRER);
-	rv_writel(val | 0x2, adata->acp3x_base + mmACP_BTTDM_IRER);
-
-	val = FRM_LEN | (slots << 15) | (slot_len << 18);
-	rv_writel(val, adata->acp3x_base + mmACP_BTTDM_TXFRMT);
-	rv_writel(val, adata->acp3x_base + mmACP_BTTDM_RXFRMT);
+	/* Enable I2S / BT channels TDM and respective
+	 * I2S/BT`s TX/RX Formats frame lengths.
+	 */
+	flen = FRM_LEN | (slots << 15) | (slot_len << 18);
 
-	adata->tdm_fmt = val;
+	if (adata->substream_type == SNDRV_PCM_STREAM_PLAYBACK) {
+		switch (adata->i2s_instance) {
+		case I2S_BT_INSTANCE:
+			reg_val = mmACP_BTTDM_ITER;
+			frmt_reg = mmACP_BTTDM_TXFRMT;
+			break;
+		case I2S_SP_INSTANCE:
+		default:
+			reg_val = mmACP_I2STDM_ITER;
+			frmt_reg = mmACP_I2STDM_TXFRMT;
+		}
+	} else {
+		switch (adata->i2s_instance) {
+		case I2S_BT_INSTANCE:
+			reg_val = mmACP_BTTDM_IRER;
+			frmt_reg = mmACP_BTTDM_RXFRMT;
+			break;
+		case I2S_SP_INSTANCE:
+		default:
+			reg_val = mmACP_I2STDM_IRER;
+			frmt_reg = mmACP_I2STDM_RXFRMT;
+		}
+	}
+	val = rv_readl(adata->acp3x_base + reg_val);
+	rv_writel(val | 0x2, adata->acp3x_base + reg_val);
+	rv_writel(flen,	adata->acp3x_base + frmt_reg);
+	adata->tdm_fmt = flen;
 	return 0;
 }
 
diff --git a/sound/soc/amd/raven/acp3x.h b/sound/soc/amd/raven/acp3x.h
index c071477..01b283a 100644
--- a/sound/soc/amd/raven/acp3x.h
+++ b/sound/soc/amd/raven/acp3x.h
@@ -76,6 +76,8 @@ struct i2s_dev_data {
 	bool tdm_mode;
 	unsigned int i2s_irq;
 	u32 tdm_fmt;
+	u16 i2s_instance;
+	u32 substream_type;
 	void __iomem *acp3x_base;
 	struct snd_pcm_substream *play_stream;
 	struct snd_pcm_substream *capture_stream;
-- 
2.7.4