amdgpu driver probe error

[Athul Krishna]

Device: ASUS Zephyrus G14 GA402RJ
CPU: AMD R7 6800HS
GPU: Radeon RX 6700S
Kernel: 6.10.8

Hello,

I have encountered a problem with this specific device. So I'll explain the backstory a little bit.

\_SB_.PCI0.GPP0.SWUS.SWDS.VGA_, this is the firmware path of the discrete GPU and \_SB_.PCI0.GPP0 is the hotplug bridge. An eject notification will remove all the devices under \_SB_.PCI0.GPP0, i.e, SWUS and SWDS(PCI-PCI bridges) and VGA_ will be gone. So will be their acpi_hotplug_context.

So device check notification to VGA_, with the current implementation of acpiphp module will not be handled. I have modified the code so that device check notification to VGA_ will runtime resume \_SB_.PCI0.GPP0(pci_pm_runtime_resume() callback), which then will enable interrupt to the bridge, and the rest will be handled by pciehp module.

Here's my problem, when device_attach() is called on the GPU, it spews out bunch of error. Most of the time I get:

amdgpu 0000:03:00.0: amdgpu: SMU: response:0xFFFFFFFF for index:2 param:0x00000000 message:GetSmuVersion?
amdgpu 0000:03:00.0: amdgpu: GPU mode1 reset failed
amdgpu 0000:03:00.0: amdgpu: asic reset on init failed
amdgpu 0000:03:00.0: amdgpu: Fatal error during GPU init

very rarely:

amdgpu 0000:03:00.0: amdgpu: PSP create ring failed!
amdgpu 0000:03:00.0: amdgpu: Fatal error during GPU init

Any help would be really appreciated. I have attached the dmesg output.

Thanks,
Athul
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