openwrt/target/linux/layerscape/patches-5.4/801-audio-0052-MLK-18682-1-ASoC-fsl-sai-use-set_bclk_ratio-to-calcu.patch

From fc4146698489c4725c9ac86ea3e0484914d5285b Mon Sep 17 00:00:00 2001
From: Viorel Suman <viorel.suman@nxp.com>
Date: Wed, 27 Jun 2018 10:31:02 +0300
Subject: [PATCH] MLK-18682-1: ASoC: fsl: sai: use set_bclk_ratio to calculate
 BCLK freq (part 1)

ALSA API has a standard way to configure DAI BCLK by calling
"snd_soc_dai_set_bclk_ratio" function. So use it to set BCLK ratio
and calculate SAI BCLK frequency.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
[ Aisheng: split machine imx-pdm changes ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 sound/soc/fsl/fsl_sai.c | 21 +++++++++++++--------
 sound/soc/fsl/fsl_sai.h |  3 +--
 2 files changed, 14 insertions(+), 10 deletions(-)

--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -234,6 +234,14 @@ static int fsl_sai_set_dai_sysclk_tr(str
 	return 0;
 }
 
+static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
+{
+	struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
+
+	sai->bitclk_ratio = ratio;
+	return 0;
+}
+
 static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 		int clk_id, unsigned int freq, int dir)
 {
@@ -243,11 +251,6 @@ static int fsl_sai_set_dai_sysclk(struct
 	if (dir == SND_SOC_CLOCK_IN)
 		return 0;
 
-	if (clk_id == FSL_SAI_CLK_BIT) {
-		sai->bitclk_freq = freq;
-		return 0;
-	}
-
 	if (freq > 0) {
 		if (clk_id < 0 || clk_id >= FSL_SAI_MCLK_MAX) {
 			dev_err(cpu_dai->dev, "Unknown clock id: %d\n", clk_id);
@@ -571,6 +574,7 @@ static int fsl_sai_hw_params(struct snd_
 	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 	unsigned int channels = params_channels(params);
 	u32 word_width = params_width(params);
+	u32 rate = params_rate(params);
 	u32 val_cr4 = 0, val_cr5 = 0;
 	u32 slots = (channels == 1) ? 2 : channels;
 	u32 slot_width = word_width;
@@ -605,12 +609,12 @@ static int fsl_sai_hw_params(struct snd_
 		slot_width = sai->slot_width;
 
 	if (!sai->slave_mode[tx]) {
-		if (sai->bitclk_freq)
+		if (sai->bitclk_ratio)
 			ret = fsl_sai_set_bclk(cpu_dai, tx,
-					sai->bitclk_freq);
+					rate * sai->bitclk_ratio);
 		else
 			ret = fsl_sai_set_bclk(cpu_dai, tx,
-				slots * slot_width * params_rate(params));
+					rate * slots * slot_width);
 		if (ret)
 			return ret;
 
@@ -935,6 +939,7 @@ static void fsl_sai_shutdown(struct snd_
 }
 
 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
+	.set_bclk_ratio = fsl_sai_set_dai_bclk_ratio,
 	.set_sysclk	= fsl_sai_set_dai_sysclk,
 	.set_fmt	= fsl_sai_set_dai_fmt,
 	.set_tdm_slot	= fsl_sai_set_dai_tdm_slot,
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -203,7 +203,6 @@
 #define FSL_SAI_CLK_MAST3	3
 
 #define FSL_SAI_MCLK_MAX	4
-#define FSL_SAI_CLK_BIT		5
 
 /* SAI data transfer numbers per DMA request */
 #define FSL_SAI_MAXBURST_TX 6
@@ -258,7 +257,7 @@ struct fsl_sai {
 	unsigned int mclk_streams;
 	unsigned int slots;
 	unsigned int slot_width;
-	unsigned int bitclk_freq;
+	unsigned int bitclk_ratio;
 
 	struct snd_soc_dai_driver cpu_dai_drv;
 	struct snd_dmaengine_dai_dma_data dma_params_rx;