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

[Takashi Iwai]

On Sat, 14 Jul 2018 14:03:26 +0200,
jimqu wrote:
> 
> 
> 
> 在 2018/7/13 23:07, Takashi Iwai 写道:
> > 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.
> 
> That is really wonderful work. I will check it on our AMD
> platform.

Thanks, it'll be great if you can check whether the current code works
or not.  I'd love to push the stuff for 4.19.  Hopefully I'll start
submitting the preparation patches in the next week.

Basically this also opens the door of the similar capability for
nouveau, and I guess it's also trivial enough.

> BTW, For display, AMD has moved to use DC to support new
> asics. so there also need a patch for amdgpu in DC code.

Could you give a more hint?  I'll try adapt the code if such a change
is already in upstream tree.


Takashi