[alsa-devel] [PATCH 0/4] drm_audio_component support for AMD/ATI HDMI codecs

[Alex Deucher]

On Mon, Jul 23, 2018 at 10:50 AM, Takashi Iwai <tiwai at suse.de> wrote:
> Hi,
>
> this is a patch set to add the support of drm_audio_component for
> AMD/ATI HDMI codecs.  With the drm_audio_component, the HDMI/DP audio
> hotplug and ELD read-out can be achieved directly without the hardware
> access.  The best point by that is that it makes the hotplug
> notification working even during runtime suspend.
>
> The support is totally optional and dynamic, hence it still works even
> if either HD-audio or DRM side isn't patched, and it'll fall back to
> the existing method.

I'm still getting my head around how the new callbacks work so bear
with me.  It seems like we'd want to set the ELD and report whether
the display is attached in when we detect the displays or fetch the
EDID rather than at modeset time when we enable the audio stream.

Alex


>
> The current patch supports only radeon and a part of amdgpu; the DC
> support isn't included yet.
>
>
> Takashi
>
> ===
>
> Takashi Iwai (4):
>   ALSA: hda/hdmi: Use single mutex unlock in error paths
>   ALSA: hda/hdmi: Allow audio component for AMD/ATI HDMI
>   drm/radeon: Add audio component support
>   drm/amdgpu: Add audio component support
>
>  drivers/gpu/drm/Kconfig                   |   2 +
>  drivers/gpu/drm/amd/amdgpu/Makefile       |   2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu.h       |   4 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_audio.c |  97 ++++++++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h  |   3 +
>  drivers/gpu/drm/amd/amdgpu/dce_v10_0.c    |   6 +
>  drivers/gpu/drm/amd/amdgpu/dce_v11_0.c    |   6 +
>  drivers/gpu/drm/amd/amdgpu/dce_v6_0.c     |   6 +
>  drivers/gpu/drm/amd/amdgpu/dce_v8_0.c     |   6 +
>  drivers/gpu/drm/radeon/radeon.h           |   3 +
>  drivers/gpu/drm/radeon/radeon_audio.c     |  79 ++++++++
>  sound/pci/hda/patch_hdmi.c                | 209 +++++++++++++++++-----
>  12 files changed, 374 insertions(+), 49 deletions(-)
>  create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_audio.c
>
> --
> 2.18.0
>
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