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HiFiBerry Amp+ 48kHz not working in 4.9 #2016

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@hifiberry

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@hifiberry

I've been informed that 48kHz on the HiFiBerry Amp+ isn't working with the latest kernel anymore. So I started debugging this.
The issue seems to be related to the 4.9 kernel. The latest 4.4 kernel is still working.

The easiest way to reproduce the issue is using sox:

sudo apt-get install sox
play -r 44100 -n synth sine 2000
play -r 48000 -n synth sine 2000

Working with 4.4:

sudo rpi-update 52241088c1da59a359110d39c1875cda56496764

Not working with 4.9 (this is the first 4.9 release from rpi-update)

sudo rpi-update 13711648ecf6f2e5aed380baaed00d47f56bcc3f

I had a short look on the I2S signal lines and there is no visible difference between 4.4 and 4.9. As 44.1kHz is working fine, I also expect that the I2C communication is working fine (did not yet check this with a logic analyser)

AFAIK, the driver itself hasn't changed between 4.4 and 4.9
Any idea what has changed in 4.9 ?

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