Hi Everyone：
调试codec芯片
按照下面设备节点播放48000HZ32bit的wav格式没有问题
&sai3 {
assigned-clock-rates = <24576000>;
fsl,sai-asynchronous;
};
但是按照下面节点播放44100Hz16bit的数据遇到如下错误
&sai3 {
assigned-clock-rates = <22579200>;
fsl,sai-asynchronous;
};
错误如下：
evk_8mm:/ # tinyplay /system/vendor/firmware/t
test_44100_16bit.wav test_48000_32bit.wav
inyplay /system/vendor/firmware/test_44100_16bit.wav <
[ 142.987713] aw8838_startup: enter
[ 142.997243] aw8838_startup: enter
[ 143.002116] aw8838_set_fmt: fmt=0x4001
[ 143.005895] lv.t aw8838_get_mclk_rate rate=44100 hz
[ 143.010802] imx-aw8838 sound-aw8838: lv.t imx_aif_hw_params mclk_freq=1411200 hz
[ 143.019388] aw8838_hw_params: requested rate: 44100, sample size: 16
[ 143.027289] aw8838_hw_params: width = 16
[ 143.032795] fsl-sai 30030000.sai: ratio 0 for freq 1411200Hz based on clock 1404343Hz
[ 143.040667] fsl-sai 30030000.sai: sai->verid.id=769
[ 143.045594] fsl-sai 30030000.sai: ret=1404343
[ 143.049996] fsl-sai 30030000.sai: failed to derive required Tx rate: 1411200
[ 143.057270] fsl-sai 30030000.sai: ASoC: can't set 30030000.sai hw params: -22
[ 143.064498] aw8838_mute: mute state=1
Unable to open PCM device 0 (cannot set hw params: Invalid argument)
evk_8mm:/ #
很奇怪这个1404343Hz是从哪来的？是由哪个函数传过去的？
错误函数如下：
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;
fsl_sai_check_ver(dai);
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;
dev_err(dai->dev, "ratio %d for freq %dHz based on clock %ldHz\n",
ratio, freq, clk_rate);
dev_err(dai->dev, "sai->verid.id=%d\n", sai->verid.id);
dev_err(dai->dev, "ret=%d\n", ret);
/*
* 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);
if ((ratio % 2 == 0 && ratio >= 2 && ratio <= 512) ||
(ratio == 1 && sai->verid.id >= FSL_SAI_VERID_0301)) {
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;
}
还有Machine的代码有如下一个函数，params_rate(params);的作用是什么？返回值是传到什么地方的
static unsigned long aw8838_get_mclk_rate(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
//struct snd_soc_pcm_runtime *rtd = substream->private_data;
//struct imx_priv *data = snd_soc_card_get_drvdata(rtd->card);
unsigned int rate = params_rate(params);
int i;
printk( "lv.t aw8838_get_mclk_rate rate=%d hz\n", rate);
/* Find the appropriate MCLK freq */
for (i = 0; i < ARRAY_SIZE(fs_mul); i++) {
if (rate >= fs_mul[i].min && rate <= fs_mul[i].max)
return rate * fs_mul[i].mul;
}
/* Let DAI manage MCLK frequency by default */
return 0;
}
请各位大佬看下，帮忙解答下
万分感谢
Best Wishes
CheLL
