linux-kernel - [PATCH 2/9] ASoC: amd: vangogh: refactor i2s master mode clock sequence code

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Date:   Wed, 23 Feb 2022 12:49:31 +0530
From:   Vijendar Mukunda <Vijendar.Mukunda@....com>
To:     <broonie@...nel.org>, <alsa-devel@...a-project.org>
CC:     <Alexander.Deucher@....com>, <Sunil-kumar.Dommati@....com>,
        <krisman@...labora.com>, <wtli@...oton.com>,
        Vijendar Mukunda <Vijendar.Mukunda@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Jaroslav Kysela" <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "open list" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/9] ASoC: amd: vangogh: refactor i2s master mode clock sequence code

Refactor I2S Master mode clock programming sequence code.
This will also fix the i2s clocks restore issue during system level
resume.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@....com>
---
 sound/soc/amd/vangogh/acp5x-i2s.c | 26 +++++++-------------------
 sound/soc/amd/vangogh/acp5x.h     | 29 +++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 19 deletions(-)

diff --git a/sound/soc/amd/vangogh/acp5x-i2s.c b/sound/soc/amd/vangogh/acp5x-i2s.c
index 002db3971ca9..59a98f89a669 100644
--- a/sound/soc/amd/vangogh/acp5x-i2s.c
+++ b/sound/soc/amd/vangogh/acp5x-i2s.c
@@ -88,10 +88,9 @@ static int acp5x_i2s_hwparams(struct snd_pcm_substream *substream,
 	struct snd_soc_card *card;
 	struct acp5x_platform_info *pinfo;
 	struct i2s_dev_data *adata;
-	union acp_i2stdm_mstrclkgen mclkgen;
 
 	u32 val;
-	u32 reg_val, frmt_reg, master_reg;
+	u32 reg_val, frmt_reg;
 	u32 lrclk_div_val, bclk_div_val;
 
 	lrclk_div_val = 0;
@@ -160,20 +159,6 @@ static int acp5x_i2s_hwparams(struct snd_pcm_substream *substream,
 	acp_writel(val, rtd->acp5x_base + reg_val);
 
 	if (adata->master_mode) {
-		switch (rtd->i2s_instance) {
-		case I2S_HS_INSTANCE:
-			master_reg = ACP_I2STDM2_MSTRCLKGEN;
-			break;
-		case I2S_SP_INSTANCE:
-		default:
-			master_reg = ACP_I2STDM0_MSTRCLKGEN;
-			break;
-		}
-		mclkgen.bits.i2stdm_master_mode = 0x1;
-		if (adata->tdm_mode)
-			mclkgen.bits.i2stdm_format_mode = 0x01;
-		else
-			mclkgen.bits.i2stdm_format_mode = 0x0;
 		switch (params_format(params)) {
 		case SNDRV_PCM_FORMAT_S16_LE:
 			switch (params_rate(params)) {
@@ -238,9 +223,8 @@ static int acp5x_i2s_hwparams(struct snd_pcm_substream *substream,
 		default:
 			return -EINVAL;
 		}
-		mclkgen.bits.i2stdm_bclk_div_val = bclk_div_val;
-		mclkgen.bits.i2stdm_lrclk_div_val = lrclk_div_val;
-		acp_writel(mclkgen.u32_all, rtd->acp5x_base + master_reg);
+		rtd->lrclk_div = lrclk_div_val;
+		rtd->bclk_div = bclk_div_val;
 	}
 	return 0;
 }
@@ -249,9 +233,11 @@ static int acp5x_i2s_trigger(struct snd_pcm_substream *substream,
 			     int cmd, struct snd_soc_dai *dai)
 {
 	struct i2s_stream_instance *rtd;
+	struct i2s_dev_data *adata;
 	u32 ret, val, period_bytes, reg_val, ier_val, water_val;
 	u32 buf_size, buf_reg;
 
+	adata = snd_soc_dai_get_drvdata(dai);
 	rtd = substream->runtime->private_data;
 	period_bytes = frames_to_bytes(substream->runtime,
 				       substream->runtime->period_size);
@@ -300,6 +286,8 @@ static int acp5x_i2s_trigger(struct snd_pcm_substream *substream,
 		}
 		acp_writel(period_bytes, rtd->acp5x_base + water_val);
 		acp_writel(buf_size, rtd->acp5x_base + buf_reg);
+		if (adata->master_mode)
+			acp5x_set_i2s_clk(adata, rtd);
 		val = acp_readl(rtd->acp5x_base + reg_val);
 		val = val | BIT(0);
 		acp_writel(val, rtd->acp5x_base + reg_val);
diff --git a/sound/soc/amd/vangogh/acp5x.h b/sound/soc/amd/vangogh/acp5x.h
index fe5e1fa98974..b85d3ee369a3 100644
--- a/sound/soc/amd/vangogh/acp5x.h
+++ b/sound/soc/amd/vangogh/acp5x.h
@@ -105,6 +105,8 @@ struct i2s_stream_instance {
 	dma_addr_t dma_addr;
 	u64 bytescount;
 	void __iomem *acp5x_base;
+	u32 lrclk_div;
+	u32 bclk_div;
 };
 
 union acp_dma_count {
@@ -191,3 +193,30 @@ static inline u64 acp_get_byte_count(struct i2s_stream_instance *rtd,
 	}
 	return byte_count.bytescount;
 }
+
+static inline void acp5x_set_i2s_clk(struct i2s_dev_data *adata,
+				     struct i2s_stream_instance *rtd)
+{
+	union acp_i2stdm_mstrclkgen mclkgen;
+	u32 master_reg;
+
+	switch (rtd->i2s_instance) {
+	case I2S_HS_INSTANCE:
+		master_reg = ACP_I2STDM2_MSTRCLKGEN;
+		break;
+	case I2S_SP_INSTANCE:
+	default:
+		master_reg = ACP_I2STDM0_MSTRCLKGEN;
+		break;
+	}
+
+	mclkgen.bits.i2stdm_master_mode = 0x1;
+	if (adata->tdm_mode)
+		mclkgen.bits.i2stdm_format_mode = 0x01;
+	else
+		mclkgen.bits.i2stdm_format_mode = 0x00;
+
+	mclkgen.bits.i2stdm_bclk_div_val = rtd->bclk_div;
+	mclkgen.bits.i2stdm_lrclk_div_val = rtd->lrclk_div;
+	acp_writel(mclkgen.u32_all, rtd->acp5x_base + master_reg);
+}
-- 
2.17.1