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bf537/ad1939: Get 'tx dma is already stopped', audio stops playing

Question asked by on Dec 22, 2017

I have a bf537, ad1939 CODEC, uClinux bf537-0.2-3.0.8-ADI-2011R1 (as printed during bootup), and ALSA.

The audio is sent out of the 8 CODEC D/A outputs, with no problems, except, occassionally, there is no audio, on any output. The printk msgs are:

      tx dma is already stopped
      sport status error: TUVF
      sport status error: TUVF


This corrects itself, usually within minutes, sometimes longer, and the audio starts playing out of the CODEC outputs properly. It may run for 16 hours, for example, then this problem occurs.