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