[alsa-devel] [PATCH] ALSA - HDA - Add period time constraint to hda-intel

[Raymond Yau]

As there is a 10 seconds schedule_timeout in alsa-kernel

The following error occur when aplay/arecord using a period time
longer than 10 seconds for for those hda codec which support rate
lower than 32000 when prealloc = 4096

ALSA hda_intel.c:1680: azx_pcm_prepare: bufsize=0x1aeb00, format=0x4111
...
ALSA pcm_native.c:1531: playback drain error (DMA or IRQ trouble?)


aplay -v -Dhw:1 --period-time=10001000 22050.wav
Playing WAVE '22050.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Stereo
Hardware PCM card 1 'HDA Intel' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 22050
  exact rate   : 22050 (22050/1)
  msbits       : 16
  buffer_size  : 441024
  period_size  : 220512
  period_time  : 10000544
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 220512
  period_event : 0
  start_threshold  : 441024
  stop_threshold   : 441024
  silence_threshold: 0
  silence_size : 0
  boundary     : 1806434304
  appl_ptr     : 0
  hw_ptr       : 0


ALSA hda_intel.c:1680: azx_pcm_prepare: bufsize=0x9c500, format=0x511
ALSA hda_codec.c:1295: hda_codec_setup_stream: NID=0x8, stream=0x1,
channel=0, format=0x511
ALSA pcm_lib.c:1789: capture write error (DMA or IRQ trouble?)

arecord -Dhw:1  -v --period-time=10005000 -r 8000 -c2 -f S16_LE /dev/null
Recording WAVE '/dev/null' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo
Hardware PCM card 1 'HDA Intel' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 16
  buffer_size  : 160064
  period_size  : 80032
  period_time  : 10004000
  tstamp_mode  : NONE
  period_step  : 1
  avail_min    : 80032
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 160064
  silence_threshold: 0
  silence_size : 0
  boundary     : 1311244288
  appl_ptr     : 0
  hw_ptr       : 0
arecord: pcm_read:1773: read error: Input/output error
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