[Bug 1931147] Re: Fix non-working GPU on Some HP desktops

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https://bugs.launchpad.net/bugs/1931147

Title:
Fix non-working GPU on Some HP desktops

Status in HWE Next:
New
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Won't Fix
Status in linux-oem-5.10 source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
Fix Committed
Status in linux-oem-5.10 source package in Hirsute:
Invalid

Bug description:
[Impact]
Integrated GPU on AMD based HP desktop doesn't work.

[Fix]
Coalesce host bridge contiguous apertures so the resources requested by
child devices can be met.

[Test]
Boot affected systems. No picture from the iGPU.
With the patch applied, iGPU can work normally.

[Where problems could occur]
Assume there are device A and device B and they request overlapped
resource region, the original logic may not be able to allocate enough
resource for A so device B claimed the resource in the end.

Once the fix is applied, the region may be big enough for device A,
hence device B won't be able to get the resource it needs.

Hopefully we don't have such broken systems.

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