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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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