Re: [PATCH 6.18.8] Revert "drm/amd: Check if ASPM is enabled from PCIe subsystem"

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Feb 03, 2026 at 08:42:15AM -0600, Mario Limonciello wrote:
> On 2/3/26 8:39 AM, Greg KH wrote:
> > On Sun, Feb 01, 2026 at 01:25:06AM +0100, Bert Karwatzki wrote:
> > > This reverts commit 7294863a6f01248d72b61d38478978d638641bee.
> > > 
> > > This commit was erroneously applied again after commit 0ab5d711ec74
> > > ("drm/amd: Refactor `amdgpu_aspm` to be evaluated per device")
> > > removed it, leading to very hard to debug crashes, when used with a system with two
> > > AMD GPUs of which only one supports ASPM.
> > > 
> > > Link: https://lore.kernel.org/linux-acpi/20251006120944.7880-1-spasswolf@web.de/
> > > Link: https://github.com/acpica/acpica/issues/1060
> > > Fixes: 0ab5d711ec74 ("drm/amd: Refactor `amdgpu_aspm` to be evaluated per device")
> > > 
> > > Signed-off-by: Bert Karwatzki <spasswolf@web.de>
> > > ---
> > >   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 3 ---
> > >   1 file changed, 3 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > > index 7333e19291cf..ec9516d6ae97 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
> > > @@ -2334,9 +2334,6 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
> > >   			return -ENODEV;
> > >   	}
> > > -	if (amdgpu_aspm == -1 && !pcie_aspm_enabled(pdev))
> > > -		amdgpu_aspm = 0;
> > > -
> > >   	if (amdgpu_virtual_display ||
> > >   	    amdgpu_device_asic_has_dc_support(pdev, flags & AMD_ASIC_MASK))
> > >   		supports_atomic = true;
> > > -- 
> > > 2.47.3
> > > 
> > > 
> > 
> > 
> > <formletter>
> > 
> > This is not the correct way to submit patches for inclusion in the
> > stable kernel tree.  Please read:
> >      https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> > for how to do this properly.
> > 
> > </formletter>
> 
> FWIW I added a stable tag to the patch when applied to amd-staging-drm-next
> for this.  So it should come back to stable once it merges in Linus' tree.

Great, thanks!

greg k-h