[alsa-devel] [RFC/RFT v2 0/4] ALSA: hda - hdmi: ATI/AMD multi-channel and HBR support

Anssi Hannula anssi.hannula at iki.fi
Tue Oct 1 22:30:52 CEST 2013

Hi all!

Here is a second revision of the ATI/AMD multichannel patch, now a

Since the last revision from a bit over the week ago, AMD has released
more documentation ( http://www.x.org/docs/AMD/AMD_HDA_verbs_v2.pdf ),
so the patchset contains new additions:

- HBR bitstreaming support (HD passthrough, for DTS-HD and Dolby TrueHD)
  o This completes the set, now we have HBR on NVIDIA, Intel and AMD :)

- More complete ELD emulation on revision 3+ (0x100300) codecs
  o Untested, though from what I can see the newly added fields may not
    be filled in yet by the radeon driver.

- Ramp up/down configuration according to non-pcm bit on rev3+
  o I guess this means gradual fade-in/out? Untested.

Other changes since the previous post:
- ELD emulation moved to hda_eld.c and cleaned up a bit
- Some fixes to hdmi_chmap_ctl_tlv() changes
(and maybe something else I forgot - if so, sorry)

Also, the pairwise channel mapping code has been tested to work with
custom channel maps. The TLV contents are shown as follows by amixer:
    | chmap-paired=FL,FR
    | chmap-paired=FL,FR,NA,LFE
    | chmap-paired=FL,FR,FC,NA
    | chmap-paired=FL,FR,RL,RR
    | chmap-paired=FL,FR,FC,LFE
    | chmap-paired=FL,FR,NA,LFE,RL,RR
    | chmap-paired=FL,FR,FC,NA,RL,RR

Rafał, do you know about the missing (AFAICS) support for lipsync (F7B)
and sink information (F81) in radeon driver?

This patchset requires at least more testing before it should be applied.

A few other somewhat open things:
- I named everything ati/ATI except for is_amdhdmi_rev3() and
  has_amd_full_remap_support() that are AMD-only, though AMD-only verbs
  I still named ATI to have similar names to other verbs. Does that
  seem sensible or how should this be done?
- Currently setup_audio_infoframe() writes the channel mapping every
  time for ATI/AMD, should we try to avoid that? If so, any
  (argh, just noticed this is broken for manual channel maps on non-ATI;
   if just the chmap is changed, channel mapping is not updated;
   so this requires fixes in the generic side as well)

I'm especially interested in testers with:

- Older codecs other than 0x1002aa01. My best guess still is that the
  new code works on them as well.
  o On these I'd like to know if multichannel and the new formats
    work, i.e. e.g.
    speaker-test -D hdmi:CARD=Generic,DEV=0 -c8 -r192000 -F S32_LE

- Codec 0x1002aa01 revisions 0x100300 (Rev ID 3) or later (see
  /proc/asound/cardX/codec#Y). These are HD7750+ I think. Stuff to be
  tested on these:
  o The ramp up/down stuff, i.e. patch 4. Is there any difference seen
    with these, in the beginning/end (i.e. fade-out/in):
    speaker-test -D hdmi:CARD=Generic,DEV=0,AES0=0x04 -c2 -r48000
    speaker-test -D hdmi:CARD=Generic,DEV=0,AES0=0x06 -c2 -r48000
    Also, is there a difference in the beginning of these
    (maybe garbage sound and/or slightly slower startup?):
    aplay -Dhdmi:CARD=Generic,DEV=0,AES0=4 -r44100 -f s16_le -c2 testi.dts.cut.spdif
    aplay -Dhdmi:CARD=Generic,DEV=0,AES0=6 -r44100 -f s16_le -c2 testi.dts.cut.spdif

  o Contents of /proc/asound/cardX/eld#0. I'd like to see the contents
    both with radeon and with the proprietary fglrx driver in use

Olivier, can you test again on your rev3 hw? :)

The patchset can be found in combined form (for e.g. testing purposes) at:

The test file referenced above can be found at:
http://onse.fi/files/testi.dts.cut.spdif.gz (just regular DTS)

Anssi Hannula (4):
      ALSA: hda - hdmi: Add ATI/AMD multi-channel audio support
      ALSA: hda - hdmi: Add ELD emulation for ATI/AMD codecs
      ALSA: hda - hdmi: Add HBR bitstreaming support for ATI/AMD HDMI codecs
      ALSA: hda - hdmi: Disable ramp-up/down for non-PCM on AMD codecs

 sound/pci/hda/hda_eld.c    | 157 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 sound/pci/hda/hda_local.h  |   5 +++
 sound/pci/hda/patch_hdmi.c | 424 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------
 3 files changed, 547 insertions(+), 39 deletions(-)

Anssi Hannula

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