I have an external codec connected to QUAT MI2S interface, with only the recording path enabled in slave mode(410 is master, SDTI is grounded).
tinymix 'MultiMedia1 Mixer QUAT_MI2S_TX' 1
to enable the recording.
I can see data on the I2S bus, but the DSP buffer shows only 0(log below, printed 10 bytes).
"msm_pcm_capture_copy:fbytes = 0: size=0: xfer=2048
Sending next buffer to dsp
Returning from capture_copy... 0
6952.669931] pcm_irq_pos = 0
Is any configuration missing ??