TLV320AIC3120 : DSP loopback works on the EVM, not on our board

Hello,

I'm having a weird problem with my PurePath project: it works well on the EVM board, but not on my custom board.
I2C communication works well, sound goes well through the ADC/DAC loopback, but I get nothing when I try to go through the DSP (none of the passthrough or the tonegenerator gives a sound ; I attached a pfw if it can help to find what's the problem)

AIC3120 on our board is connected like on the typical circuit configuration (SLAS653A page 19) with those differences :
- I2S pins left floating (WCLK, BCLK, DIN, DOUT)
- GPIO1 left floating (only used as output the verify internal clocks)

Could you help me to make it work ?

Thanks in advance,
Jérôme