~kamalmostafa/ubuntu/+source/linux-aws/+git/disco:graviton-lp1834962

Last commit made on 2019-07-11
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Name:
graviton-lp1834962
Repository:
lp:~kamalmostafa/ubuntu/+source/linux-aws/+git/disco

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8a9b555... by Frank van der Linden <email address hidden> on 2019-05-31

UBUNTU: SAUCE: [aws] arm64: acpi/pci: invoke _DSM whether to preserve firmware PCI setup

BugLink: https://bugs.launchpad.net/bugs/1834962

On arm64 ACPI systems, we unconditionally reconfigure the entire PCI
hierarchy at boot. This is a departure from what is customary on ACPI
systems, and may break assumptions in some places (e.g., EFIFB), that
the kernel will leave BARs of enabled PCI devices where they are.

Given that PCI already specifies a device specific ACPI method (_DSM)
for PCI root bridge nodes that tells us whether the firmware thinks
the configuration should be left alone, let's sidestep the entire
policy debate about whether the PCI configuration should be preserved
or not, and put it under the control of the firmware instead.

[not upstream, taken from https://patchwork.kernel.org/patch/9675707/]

Signed-off-by: Ard Biesheuvel <email address hidden>
Signed-off-by: Kamal Mostafa <email address hidden>

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