1. 16 Jan, 2014 2 commits
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  6. 10 Jan, 2014 1 commit
    • Sarah Bessmer's avatar
      ALSA: ctxfi - Work around emu20k1 glitch to prevent buffered sound data loss · e240a469
      Sarah Bessmer authored
      Occasionally, on playback stream ringbuffer wraparound, the EMU20K1
      hardware will momentarily return 0 instead of the proper current(loop)
      address. This patch handles that case, fixing the problem of playback
      position corruption and subsequent loss of buffered sound data, that
      occurs with some common buffering layout patterns(e.g. multiple
      simultaneous output streams with differently-sized or
      non-power-of-2-sized buffers).
      
      An alternate means of fixing the problem would be to read the ca
      register continuously, until two sequential reads return the same
      value; however, that would be a more invasive change, has performance
      implications, and isn't necessary unless there are also issues with the
      value not being updated atomically in regards to individual bits or
      something similar(which I have not encountered through light testing).
      
      I have no EMU20K2 hardware to confirm if the issue is present there,
      but even if it's not, this change shouldn't break anything that's not
      already broken.
      Signed-off-by: default avatarSarah Bessmer <aotos@fastmail.fm>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      e240a469
  7. 09 Jan, 2014 7 commits
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  11. 05 Jan, 2014 1 commit