The code hang in fsl-sai.c in sound/soc/fsl
ret = fsl_sai_set_bclk(cpu_dai, tx, bclk);
There are two reasons may cause code hang.I think the problem is clk.You can debug the fsl-sai to find correct params of your codec.
1.ratio set error,code can not enter //1
2. ret set error, code can not enter //2
static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
{
struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
unsigned char offset = sai->soc->reg_offset;
unsigned long clk_rate;
unsigned int reg = 0;
u32 ratio, savesub = freq, saveratio = 0, savediv = 0;
u32 id;
int ret = 0;
/* Don't apply to slave mode */
if (sai->slave_mode[tx])
return 0;
for (id = 0; id < FSL_SAI_MCLK_MAX; id++) {
clk_rate = clk_get_rate(sai->mclk_clk[id]);
if (!clk_rate)
continue;
ratio = clk_rate / freq;
ret = clk_rate - ratio * freq;
/*
* Drop the source that can not be
* divided into the required rate.
*/
if (ret != 0 && clk_rate / ret < 1000)
continue;
dev_dbg(dai->dev,
"ratio %d for freq %dHz based on clock %ldHz\n",
ratio, freq, clk_rate);
//1
if ((ratio % 2 == 0 && ratio >= 2 && ratio <= 512) ||
(ratio == 1 && sai->verid.id >= FSL_SAI_VERID_0301)) {
//2
if (ret < savesub) {
saveratio = ratio;
sai->mclk_id[tx] = id;
savesub = ret;
}
if (ret == 0)
break;
}
}
if (saveratio == 0) {
dev_err(dai->dev, "failed to derive required %cx rate: %d\n",
tx ? 'T' : 'R', freq);
return -EINVAL;
}
