[Bug 110904] [VKMS] vblank counter error

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110904

            Bug ID: 110904
           Summary: [VKMS] vblank counter error
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: oleg.vasilev at intel.com

VKMS uses vblank simulation through hrtimer.

Updates to vblank counter in DRM are performed through drm_update_vblank_count,
where the elapsed time in ns divided by vblank period.

VKMS vblank timestamp computation approach results in negative elapsed time,
which leads to trash u64 division result.

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