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

[jimqu]

On 2018年07月11日 15:19, Takashi Iwai wrote:
> On Tue, 10 Jul 2018 13:21:00 +0200,
> Takashi Iwai wrote:
>>> revert the fix of amdgpu suspend issue, audio issue also can be observed.
>> Did you check the behavior with the single AMD GPU hardware?
>> If confirmed, we can forget about vga_switcheroo.
> ... and taking a look back at the recent changes, I guess it can be
> the forced runtime PM enablement, not directly with vga_switcheroo
> action itself.

Yeah, the function vga_switcheroo_set_dynamic_switch() has discarded, so 
there is no way GFX driver to control audio power. However, keep in 
mind, current audio is bound to iGPU, that mean the issue should be 
nothing about
vgaswtichreoo. since current audio pci bus is different from dGPU, that 
means the pci_bus_set_current_state() in 
vga_switcheroo_runtime_suspend() and pci_wakeup_bus() in 
vga_switcheroo_runtime_resume() could not touch the audio pci power 
state from dGPU instance.

This is a feedback got from our OEM developer, it is the overview of 
audio detect process.

> First, the kernel  audio driver will be triggered to read ELD, if the
 >> ELD is valid, it will report a jack event (on or available) to sound
 >> core driver; the pulseaudio subscribe all jack events, if it is told
 >> that the hdmi jack is plugged in (on), the pulseaudio will set this
 >> port to available, then the pa-card or pa-sink has available port, it
 >> can be selected (manually, some daemons or policy in
 >> /usr/share/pulseaudio/alsa-mixer/) as default output card/default sink.

If the description is correct. I think there are maybe two problems.

1. audio will auto power off after setup device link duo to usage_count=0.
2. duo to audio is power down, it could not get the HDMI jack insert event.

How do you think?

> Jim, could you tell me which PCI devices are handled as vga_switcheroo
> audio client?  The kernel should show all messages "xxx: Handle
> vga_switcheroo audio client".

[    4.311095] snd_hda_intel 0000:06:00.1: enabling device (0000 -> 0002)
[    4.314286] snd_hda_intel 0000:06:00.1: Handle vga_switcheroo audio 
client
[    4.314822] snd_hda_intel 0000:06:00.6: enabling device (0000 -> 0002)

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Device [1002:699f] (rev c3)
06:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Device [1002:15dd] (rev d1)
06:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] 
Device [1002:15de]

Thanks
JimQu
> At best, give the full dmesg output and the lspci -nv output.
>
>
> thanks,
>
> Takashi

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