[PATCH] ASoC: fsl_sai: Implement set_bclk_ratio

[Daniel Baluta]

From: Viorel Suman <viorel.su...@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-...@nxp.com>
Signed-off-by: Viorel Suman <viorel.su...@nxp.com>
Signed-off-by: Daniel Baluta <daniel.bal...@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