Re: [REGRESSION 5.19.x] AMD HD-audio devices missing on 5.19

[Takashi Iwai]

On Tue, 06 Sep 2022 17:41:51 +0200,
Jason Gunthorpe wrote:
> 
> On Tue, Aug 23, 2022 at 05:28:24PM -0300, Jason Gunthorpe wrote:
> > On Tue, Aug 23, 2022 at 01:46:36PM +0200, Takashi Iwai wrote:
> > > It was tested now and confirmed that the call path is via AMDGPU, as
> > > expected:
> > >   amdgpu_pci_probe ->
> > >   amdgpu_driver_load_kms ->
> > >   amdgpu_device_init ->
> > >   amdgpu_amdkfd_device_init ->
> > >   kgd2kfd_device_init ->
> > >   kgd2kfd_resume_iommu ->
> > >   kfd_iommu_resume ->
> > >   amd_iommu_init_device ->
> > >   iommu_attach_group ->
> > >   __iommu_attach_group
> > 
> > Oh, when you said sound intel I thought this was an Intel CPU..
> > 
> > Yes, there is this hacky private path from the amdgpu to
> > the amd iommu driver that makes a mess of it here. We discussed it in
> > this thread:
> > 
> > https://lore.kernel.org/linux-iommu/YgtuJQhY8SNlv9%2F6@xxxxxxxxxx/
> > 
> > But nobody put it together that it would be a problem with this.
> > 
> > Something like this, perhaps, but I didn't check if overriding the
> > type would cause other problems.
> 
> Takashi, do we want to do this patch?

I really have no much preference regarding the fix for this
regression from my side.  If you can work on it, it'd be greatly
appreciated.


thanks,

Takashi