[Bug 94126] [SKL/KBL] Vblank counter issues when DMC takes goes to DC5/DC6 impacting frontbuffer tracking and PSR with X modesetting(0) driver.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94126

--- Comment #7 from Jim Bride <jim.bride at linux.intel.com> ---
I want to do a run with vblank debug messages turned on to ensure that my
understanding of what's going on here is correct, but from looking at the code
I think we should be able to handle this case (where we lose the HW vblank
count due to a power management event) similarly to what would happen if the
counter wrapped around.  We'll likely want to modify drm_update_vblank_count()
to ensure that DRM's software counter gets adjusted
properly when we lose our HW counter.

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