linux-kernel - [PATCH 1/7] ASoC: fsl_sai: Add PDM daifmt support

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Date:   Tue, 14 Jun 2022 12:11:18 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     nicoleotsuka@...il.com, Xiubo.Lee@...il.com, festevam@...il.com,
        shengjiu.wang@...il.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        robh+dt@...nel.org, krzk+dt@...nel.org, devicetree@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] ASoC: fsl_sai: Add PDM daifmt support

PDM format is used for 1-bit stream, so clear the FBT and SYWD,
and the each dataline only has one channel data.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 sound/soc/fsl/fsl_sai.c | 17 +++++++++++++++--
 sound/soc/fsl/fsl_sai.h |  1 +
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 4f5bd9597c74..d11ee3b6f163 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -224,6 +224,7 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
 	if (!sai->is_lsb_first)
 		val_cr4 |= FSL_SAI_CR4_MF;
 
+	sai->is_pdm_mode = false;
 	/* DAI mode */
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
@@ -262,6 +263,11 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		sai->is_dsp_mode = true;
 		break;
+	case SND_SOC_DAIFMT_PDM:
+		val_cr2 |= FSL_SAI_CR2_BCP;
+		val_cr4 &= ~FSL_SAI_CR4_MF;
+		sai->is_pdm_mode = true;
+		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		/* To be done */
 	default:
@@ -470,6 +476,13 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 
 	pins = DIV_ROUND_UP(channels, slots);
 
+	/*
+	 * PDM mode, channels are independent
+	 * each channels are on one dataline/FIFO.
+	 */
+	if (sai->is_pdm_mode)
+		pins = channels;
+
 	if (!sai->is_consumer_mode) {
 		if (sai->bclk_ratio)
 			ret = fsl_sai_set_bclk(cpu_dai, tx,
@@ -492,13 +505,13 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 		}
 	}
 
-	if (!sai->is_dsp_mode)
+	if (!sai->is_dsp_mode && !sai->is_pdm_mode)
 		val_cr4 |= FSL_SAI_CR4_SYWD(slot_width);
 
 	val_cr5 |= FSL_SAI_CR5_WNW(slot_width);
 	val_cr5 |= FSL_SAI_CR5_W0W(slot_width);
 
-	if (sai->is_lsb_first)
+	if (sai->is_lsb_first || sai->is_pdm_mode)
 		val_cr5 |= FSL_SAI_CR5_FBT(0);
 	else
 		val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 1c8f5ca07f9d..bc2a86a413e1 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -259,6 +259,7 @@ struct fsl_sai {
 	bool is_consumer_mode;
 	bool is_lsb_first;
 	bool is_dsp_mode;
+	bool is_pdm_mode;
 	bool synchronous[2];
 
 	unsigned int mclk_id[2];
-- 
2.17.1