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BeagleBone Black linux McASP S/PDIF

Hi,

i'd like to connect my board to AV receiver via S/PDIF interface. I've switched McASP0 to work in S/PDIF format (change mcasp0 op-mode to 1in device tree overlay) It looks that output stream is now propertly (biphase) encoded, but it has twice to low clock rate. I can only hear noise.

After driver load ACLK is equal to AHCLK (24.576MHz) but during playback it is divided by 8. How to change this clock divider to 4?