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[Impact]
Blank DP display after S3 on Intel GFX in ICL PCH desktop.
[Fix]
Use proper IRQ setup so the system in question can detect HPD after S3.
[Test]
Suspend and resume the system. No picture on DP display.
With the patch applied, DP display works as expected.
[Where problems could occur]
It changes how the Intel GFX setup its HPD IRQ, so hotplug detection
will be affected. This change is limited to ICL PCH.
This is the second patch of "drm/i915/gen9bc: Handle TGP PCH during
suspend/resume", but somehow it was omitted.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Fix ICL PCH no picture after S3
https://bugs.launchpad.net/bugs/1930582
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