[Bug 107724] [CI][DRMTIP] igt@* - dmesg-warn / dmesg-fail - *ERROR* CPU pipe [ABC] FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107724

--- Comment #7 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
The pipe C IIR noise is a bit odd. Bspec it seems to be telling me that these
registers live in PG2, whereas the code appears to assume that the register
lives in whatever power well the pipe lives in. So that might be a bit wrong in
the code (though it should probably still work just fine) or the spec is wrong.
Either way since all the power wells up to pg4 should be enabled it shouldn't
really matter here either way. I agree with Paulo that DMC might have something
to do with this as well.

The WARN_ON(!intel_pstate->base.fb) is also mysterious. We should have either
reused the BIOS fb or disabled all the planes. So can't really see how an
enabled plane could get that far without a framebuffer.

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