Commits on Aug 20, 2022

1. Rockchip/rk3399-gru-sound: Use 48KHz sample rate for all devices …

   The rk3399-gru-kevin board has problems when trying to simultaneously
   playback and record audio with the default PulseAudio sample rate of
   44.1KHz. When the following command is run, the playback starts a few
   seconds after the recording finishes.
   
       arecord -vvv -d 4 /dev/null & sleep 0.2; \
       speaker-test -l 1 -p 100000 -t sine
   
   When the sample rates are set to 48KHz either with PA configuration or
   in the UCM, playback and recording both start immediately. Another
   example is when a music player is running and we start `arecord`, the
   music starts stuttering but `arecord` can't record anything either.
   
   Apparently, this is a hardware limitation due to the I2S lines being
   shared between the devices. Set all the device rates to 48KHz like
   Chrome OS does to make things work smoothly.
   
   [1] https://chromium-review.googlesource.com/389695
   [2] https://chromium-review.googlesource.com/898682
   
   Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

   

   alpernebbi committed Aug 20, 2022
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