答复: 答复: [alsa-devel] 答复: [PATCH] vgaswitchroo: set audio client id according to bound gpu client id

[Takashi Iwai]

On Wed, 11 Jul 2018 13:12:01 +0200,
Takashi Iwai wrote:
> 
> And the forced runtime PM is still an issue, and this would need the
> other notification mechanism than the HD-audio unsolicited event as
> AMD HDMI controller doesn't honor the HD-audio WAKEEN bit.

Since we had a nice "hack week" in this week at SUSE, I spent some
time to write some patches for the support of the direct hotplug
notification / ELD query between HD-audio and radeon/amdgpu.  It
re-utilizes the audio component framework for i915 but in a slightly
more flexible way.

The patches are found in topic/hda-acomp branch of my sound.git tree:
  git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git

The following commits are relevant:
  drm/i915: Split audio component to a generic type
  ALSA: hda/i915: Allow delayed i915 audio component binding
  ALSA: hda/i915: Associate audio component with devres
  ALSA: hda: Make audio component support more generic
  ALSA: hda/hdmi: Allow audio component for AMD/ATI HDMI
  ALSA: hda/hdmi: Use single mutex unlock in error paths
  drm/radeon: Add audio component support
  drm/amdgpu: Add audio component support

The branch should be cleanly pullable onto the latest 4.18-rc.

I couldn't test amdgpu but the test with a radeon driver on an old
laptop seemed working through a very quick test.

Please give it a try.


thanks,

Takashi