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From:   Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@amd.com>
CC:     <Alexander.Deucher@amd.com>,
        Ravulapati Vishnu vardhan rao 
        <Vishnuvardhanrao.Ravulapati@amd.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Jaroslav Kysela <perex@perex.cz>,
        "Takashi Iwai" <tiwai@suse.com>,
        Vijendar Mukunda <Vijendar.Mukunda@amd.com>,
        "Maruthi Srinivas Bayyavarapu" <Maruthi.Bayyavarapu@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@alsa-project.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 4/7] ASoC: amd: add ACP3x TDM mode support
Date:   Sat, 19 Oct 2019 02:35:42 +0530
Message-ID: <1571432760-3008-4-git-send-email-Vishnuvardhanrao.Ravulapati@amd.com>
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References: <1571432760-3008-1-git-send-email-Vishnuvardhanrao.Ravulapati@amd.com>
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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@amd.com>
---
 sound/soc/amd/raven/acp3x-i2s.c | 51 +++++++++++++++++++++++++++++++++--------
 sound/soc/amd/raven/acp3x.h     |  2 ++
 2 files changed, 43 insertions(+), 10 deletions(-)

diff --git a/sound/soc/amd/raven/acp3x-i2s.c b/sound/soc/amd/raven/acp3x-i2s.c
index b7f610f..7e22d22 100644
--- a/sound/soc/amd/raven/acp3x-i2s.c
+++ b/sound/soc/amd/raven/acp3x-i2s.c
@@ -43,7 +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)
 {
 	u32 val = 0;
-	u16 slot_len;
+	u32 mode = 0;
+	u16 slot_len, flen;
 
 	struct i2s_dev_data *adata = snd_soc_dai_get_drvdata(cpu_dai);
 
@@ -64,16 +65,46 @@ 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);
+	/* Enable I2S / BT channels TDM and respective
+	 * I2S/BT`s TX/RX Formats frame lengths.
+	 */
+	flen = (FRM_LEN | (slots << 15) | (slot_len << 18));
 
-	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);
-
-	adata->tdm_fmt = val;
+	if (adata->substream_type == SNDRV_PCM_STREAM_PLAYBACK) {
+		switch (adata->i2s_instance) {
+		case I2S_BT_INSTANCE:
+			val = rv_readl(adata->acp3x_base + mmACP_BTTDM_ITER);
+			rv_writel((val | 0x2),
+				adata->acp3x_base + mmACP_BTTDM_ITER);
+			rv_writel(flen,
+				adata->acp3x_base + mmACP_BTTDM_TXFRMT);
+		break;
+		case I2S_SP_INSTANCE:
+			val = rv_readl(adata->acp3x_base + mmACP_I2STDM_ITER);
+			rv_writel((val | 0x2),
+				adata->acp3x_base + mmACP_I2STDM_ITER);
+			rv_writel(flen,
+				adata->acp3x_base + mmACP_I2STDM_TXFRMT);
+		}
+	} else {
+		switch (adata->i2s_instance) {
+		case I2S_BT_INSTANCE:
+			val = rv_readl(adata->acp3x_base + mmACP_BTTDM_IRER);
+			rv_writel((val | 0x2),
+				adata->acp3x_base + mmACP_BTTDM_IRER);
+			rv_writel(flen,
+				adata->acp3x_base + mmACP_BTTDM_RXFRMT);
+		break;
+		case I2S_SP_INSTANCE:
+		default:
+			val = rv_readl(adata->acp3x_base + mmACP_I2STDM_IRER);
+			rv_writel((val | 0x2),
+				adata->acp3x_base + mmACP_I2STDM_IRER);
+			rv_writel(flen,
+				adata->acp3x_base + mmACP_I2STDM_RXFRMT);
+		}
+	}
+	adata->tdm_fmt = flen;
 	return 0;
 }
 
diff --git a/sound/soc/amd/raven/acp3x.h b/sound/soc/amd/raven/acp3x.h
index b1990c9..dba7065 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