[SRU] [Bionic/Cosmic/Unstable] [PATCH 0/1] Fix unusable NVIDIA GPU after S3

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1793338

[Impact]
NVIDIA GPU on a new system we have becomes unusable after S3.

[Test]
The NVIDIA GPU in question works well after applying this patch.

[Fix]
Rewrite 0 to Intel PCI bridge 'Prefetchable Base Upper 32 Bits'.
This should be done by BIOS S3 code [1], but now the issue reappears, let's
do the same in Linux PCI subsystem.

[Regression Potential]
Low.
After applying this patch I haven't noticed any change on already
working PCI devices.
Also this patch is acked by PCI and ACPI maintainers, so we can be more
confident.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=116851#c23

Daniel Drake (1):
  PCI: Reprogram bridge prefetch registers on resume

 drivers/pci/pci.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

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2.17.1