Re: Regression with commit PCI: mvebu: Convert to PCI emulated bridge config space

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Hello,

On Tue, 18 Dec 2018 12:31:51 +0000, Luís Mendes wrote:

> I've been running Linux on a armhf with an AMD gpu card and since this
> commit, in linux 4.20, the amdgpu driver causes a kernel oops and fails to
> initialize when calling pci_map_rom, which then fails on a call to
> ioremap_page_range. If I revert the patch from commit
> 
> 1f08673eef1236f7d02d93fcf596bb8531ef0d12
> <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.20-rc7&id=1f08673eef1236f7d02d93fcf596bb8531ef0d12>
> then
> amdgpu successfully initializes.
> 
> The kernel oops follows in attachment.

Thanks for the bug report! I have an idea of what could be causing
this, I've cooked a patch, I'm doing a build test. I of course won't be
able to test it as I don't have amdgpu hardware, but I'll share the
patch with you for testing.

Note: I'm not sure where you found <linux-pci@xxxxxxxxxxxxxxxxxxxxxxxx>
to be the address of the linux-pci mailing list, it's really
linux-pci@xxxxxxxxxxxxxxx.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com



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