The problem is visible in the following setup (on the imx6q):
"simple-audio-card" -> ssi2 -> I2S + I2C -> codec
The function call log (simple-card probe -> CONFIG_SND_SIMPLE_CARD):
asoc_simple_card_init_dai() @ sound/soc/generic/simple-card-utils.c
snd_soc_dai_set_sysclk()
fsl_ssi_set_dai_sysclk() @ sound/soc/fsl/fsl_ssi.c
The last call is changing the bit clock (BCLK) frequency to SSI's IP
block clock (ipg = 66 MHz) [1].
This is wrong, since IMX SSI block requires the I2S BCLK to be less
than 1/5 of [1].
As a result the driver initialization passes without any errors, but the
speaker-test test case breaks.
This commit checks if the fsl_ssi_set_dai_sysclk() frequency passed is
not equal to [1].
Signed-off-by: Lukasz Majewski <lukma@xxxxxxx>
---
sound/soc/fsl/fsl_ssi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 173cb84..1186fa9 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -809,6 +809,8 @@ static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
+ if (clk_get_rate(ssi_private->clk) == freq)
+ return 0;
ssi_private->bitclk_freq = freq;
--
2.1.4
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