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    • Takashi Iwai's avatar
      ALSA: hda/hdmi: Static PCM mapping again with AMD HDMI codecs · 090ddad4
      Takashi Iwai authored
      The recent code refactoring for HD-audio HDMI codec driver caused a
      regression on AMD/ATI HDMI codecs; namely, PulseAudioand pipewire
      don't recognize HDMI outputs any longer while the direct output via
      ALSA raw access still works.
      
      The problem turned out that, after the code refactoring, the driver
      assumes only the dynamic PCM assignment, and when a PCM stream that
      still isn't assigned to any pin gets opened, the driver tries to
      assign any free converter to the PCM stream.  This behavior is OK for
      Intel and other codecs, as they have arbitrary connections between
      pins and converters.  OTOH, on AMD chips that have a 1:1 mapping
      between pins and converters, this may end up with blocking the open of
      the next PCM stream for the pin that is tied with the formerly taken
      converter.
      
      Also, with the code refactoring, more PCM streams are exposed than
      necessary as we assume all converters can be used, while this isn't
      true for AMD case.  This may change the PCM stream assignment and
      confuse users as well.
      
      This patch fixes those problems by:
      
      - Introducing a flag spec->static_pcm_mapping, and if it's set, the
        driver applies the static mapping between pins and converters at the
        probe time
      - Limiting the number of PCM streams per pins, too; this avoids the
        superfluous PCM streams
      
      Fixes: ef6f5494 ("ALSA: hda/hdmi: Use only dynamic PCM device allocation")
      Cc: <stable@vger.kernel.org>
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=216836Co-developed-by: default avatarJaroslav Kysela <perex@perex.cz>
      Signed-off-by: default avatarJaroslav Kysela <perex@perex.cz>
      Link: https://lore.kernel.org/r/20221228125714.16329-1-tiwai@suse.deSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      090ddad4
  11. 27 Dec, 2022 2 commits
  12. 26 Dec, 2022 8 commits