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

[Alex Deucher]

On Sat, Jul 14, 2018 at 12:31 PM, Takashi Iwai <tiwai at suse.de> wrote:
> 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.

The new code is in drivers/gpu/drm/amd/display.

Alex