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    • Anssi Hannula's avatar
      ALSA: hda - Reset sample sizes and max bitrates when reading ELD · 0bbaee3a
      Anssi Hannula authored
      When a new HDMI/DP device is plugged in, hdmi_update_short_audio_desc()
      is called for every SAD (Short Audio Descriptor) in the ELD data. For
      LPCM coding type SAD defines the supported sample sizes. For several
      other coding types (such as AC-3), a maximum bitrate is defined.
      
      The maximum bitrate and sample size fields are not always cleared.
      Therefore, if a device is unplugged and a different one is plugged in,
      and the coding types of some SAD positions differ between the devices,
      the old max_bitrate or sample_bits values will persist if the new SADs
      do not define those values.
      
      The leftover max_bitrate and sample_bits do not cause any issues other
      than wrongly showing up in eld#X.Y procfs file and kernel log.
      
      Fix that by always clearing sample_bits and max_bitrate when reading
      SADs.
      Signed-off-by: default avatarAnssi Hannula <anssi.hannula@iki.fi>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      0bbaee3a
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