1. 30 10月, 2019 1 次提交
    • K
      ALSA: hda/hdmi - implement mst_no_extra_pcms flag · 2a2edfbb
      Kai Vehmanen 提交于
      To support the DP-MST multiple streams via single connector feature,
      the HDMI driver was extended with the concept of backup PCMs. See
      commit 9152085d ("ALSA: hda - add DP MST audio support").
      
      This implementation works fine with snd_hda_intel.c as PCM topology
      is fully managed within the single driver.
      
      When the HDA codec driver is used from ASoC components, the concept
      of backup PCMs no longer fits. For ASoC topologies, the physical
      HDMI converters are presented as backend DAIs and these should match
      with hardware capabilities. The ASoC topology may define arbitrary
      PCMs (i.e. frontend DAIs) and have processing elements before eventual
      routing to the HDMI BE DAIs. With backup PCMs, the link between
      FE and BE DAIs would become dynamic and change when monitors are
      (un)plugged. This would lead to modifying the topology every time
      hotplug events happen, which is not currently possible in ASoC and
      there does not seem to be any obvious benefits from this design.
      
      To overcome above problems and enable the HDMI driver to be used
      from ASoC, this patch adds a new mode (mst_no_extra_pcms flags) to
      patch_hdmi.c. In this mode, the codec driver does not assume
      the backup PCMs to be created.
      Signed-off-by: NKai Vehmanen <kai.vehmanen@linux.intel.com>
      Reviewed-by: NTakashi Iwai <tiwai@suse.de>
      Reviewed-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
      Link: https://lore.kernel.org/r/20191029134017.18901-2-kai.vehmanen@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>
      2a2edfbb
  2. 29 10月, 2019 6 次提交
  3. 28 10月, 2019 32 次提交
  4. 25 10月, 2019 1 次提交