The fsl_ssi always has a bclk_ratio of 64 in ssi master
mode, no matter the configured word length.
Add a rule which constrains the bclk_ratio to 64 in
ssi master mode.
Signed-off-by: Sven Van Asbroeck <TheSven73@xxxxxxxxx>
---
sound/soc/fsl/fsl_ssi.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 0a648229e643..1c5b674fe253 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -627,6 +627,29 @@ static void fsl_ssi_setup_ac97(struct fsl_ssi *ssi)
regmap_write(regs, REG_SSI_SOR, SSI_SOR_WAIT(3));
}
+static int fsl_ssi_hw_rule_i2s_master(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval *it = hw_param_interval(params,
+ SNDRV_PCM_HW_PARAM_BCLK_RATIO);
+ struct fsl_ssi *ssi = rule->private;
+ struct snd_interval t;
+
+ if (!fsl_ssi_is_i2s_master(ssi))
+ return 0;
+
+ /*
+ * In i2s master mode, the ssi always generates 32 physical
+ * bits/channel. This mode always has 2 channels.
+ * This results in a fixed bclk_ratio of 64.
+ */
+ memset(&t, 0, sizeof(t));
+ t.min = t.max = 64;
+ t.integer = 1;
+
+ return snd_interval_refine(it, &t);
+}
+
static int fsl_ssi_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
@@ -648,6 +671,12 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
+ snd_pcm_hw_rule_add(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_BCLK_RATIO,
+ fsl_ssi_hw_rule_i2s_master, ssi,
+ SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_CHANNELS,
+ -1);
+
return 0;
}
--
2.17.1
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
