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Subject[PATCH] ASoC: fsl_sai: Implement set_bclk_ratio
Date
From: Viorel Suman <viorel.suman@nxp.com>

This is to allow machine drivers to set a certain bitclk rate
which might not be exactly rate * frame size.

Cc: NXP Linux Team <linux-imx@nxp.com>
Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
---
sound/soc/fsl/fsl_sai.c | 21 +++++++++++++++++++--
sound/soc/fsl/fsl_sai.h | 1 +
2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index fe126029f4e3..e896b577b1f7 100644
--- a/sound/soc/fsl/fsl_sai.c
+++ b/sound/soc/fsl/fsl_sai.c
@@ -137,6 +137,16 @@ static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
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->bclk_ratio = ratio;
+
+ return 0;
+}
+
static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int fsl_dir)
{
@@ -423,8 +433,14 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
slot_width = sai->slot_width;

if (!sai->is_slave_mode) {
- ret = fsl_sai_set_bclk(cpu_dai, tx,
- slots * slot_width * params_rate(params));
+ if (sai->bclk_ratio)
+ ret = fsl_sai_set_bclk(cpu_dai, tx,
+ sai->bclk_ratio *
+ params_rate(params));
+ else
+ ret = fsl_sai_set_bclk(cpu_dai, tx,
+ slots * slot_width *
+ params_rate(params));
if (ret)
return ret;

@@ -640,6 +656,7 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
}

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,
diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
index 3a3f6f8e5595..f96f8d97489d 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -177,6 +177,7 @@ struct fsl_sai {
unsigned int mclk_streams;
unsigned int slots;
unsigned int slot_width;
+ unsigned int bclk_ratio;

const struct fsl_sai_soc_data *soc_data;
struct snd_dmaengine_dai_dma_data dma_params_rx;
--
2.17.1
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