ASoC: fsl_sai: Implement set_bclk_ratio

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>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/20190830215910.31590-1-daniel.baluta@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 20 insertions, 2 deletions

diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
index 728307acab90..ef0b74693093 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;
 
@@ -630,6 +646,7 @@ 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 b89b0ca26053..b12cb578f6d0 100644
--- a/sound/soc/fsl/fsl_sai.h
+++ b/sound/soc/fsl/fsl_sai.h
@@ -176,6 +176,7 @@ 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;