Rockchip/rk3399-gru-sound: Use 48KHz sample rate for all devices #201
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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.
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 butarecord
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