why the sai output signal(SAI2_TXD pin) is not sync with bclk(SAI2_BCLK)

[snail246]

I use SAI2(chip imx6ull) with TDM mode, kernel config like these:

fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF |
                  SND_SOC_DAIFMT_CBM_CFM;

snd_soc_dai_set_tdm_slot(cpu_dai, 0, 0, 16, 32);

DSP_A mode, channel 16, 32bit,

aplay special wav file, and its data is 0dB in channel0,

the msb bit31 is 0, other bits are 0,

[igorpadykov]

Hi snail246

what bsp used in the case, one can look at below dts

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6ull-14x14-evk.dts?h=...

https://source.codeaurora.org/external/imx/linux-imx/tree/arch/arm/boot/dts/imx6ul-14x14-evk.dtsi?h=...

tdm hints :

https://community.nxp.com/t5/i-MX-Processors/How-to-setup-sai1-tdm-mode-for-imx8mq-evk/m-p/888020

Test sai2 using Chapter 7 Audio    i.MX Linux Reference Manual​

Best regards
igor