Hello:
When I do loop auto test of reboot, I found kernel may halt
on memcpy_fromio of amdgpu's amdgpu_uvd_suspend, so I remove suspend
process in amdgpu_pci_shutdown, and it will fix this bug.
I have 3 questions to ask:
1. In amdgpu_pci_shutdown, the comment explains why we must execute
suspend, so I know VM will call amdgpu driver in which situations, as I
know, VM's graphics card is a virtual card;
2. I see a path that is commited by Alex Deucher, the commit message is
as follows:
drm/amdgpu: just suspend the hw on pci shutdown
We can't just reuse pci_remove as there may be userspace still
doing things.
My question is:In which situations, there may be userspace till doing
things.
3. Why amdgpu driver is halted on memcpy_fromio of amdgpu_uvd_suspend, I
haven't launch any video app during reboot test, is it the bug of pci bus?
Test environment:
CPU: arm64
Graphics card: r7340(amdgpu), rx550
OS: ubuntu 2004
