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