[SRU] [F/Unstable/OEM-5.6] [PATCH 0/1] Fix IOMMU error on AMD Radeon Pro W5700

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1890306

[Impact]
AMD Radeon Pro W5700 doesn't work at all, driver failed to probe the
device due to IOMMU error.

[Fix]
Disable PCI ATS for the device.

[Test]
After applying the patch, there's no more IOMMU error, and the driver
can correctly probe the device. The grahpics also works great.

[Regression Potential]
Low. amdgpu is known to work well with ATS disabled. In addition to
that, AMD confirmed it's the correct fix for this card, so the chance to
break anything is rather low.

Kai-Heng Feng (1):
  PCI: Mark AMD Navi10 GPU rev 0x00 ATS as broken

 drivers/pci/quirks.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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2.17.1