Bug 110904

Summary:	[VKMS] vblank counter error
Product:	DRI	Reporter:	Oleg Vasilev <oleg.vasilev>
Component:	DRM/other	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	DRI git
Hardware:	Other
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Oleg Vasilev 2019-06-12 11:10:49 UTC

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.

Comment 1 Oleg Vasilev 2019-06-13 09:29:11 UTC

Fixed by https://patchwork.freedesktop.org/patch/308881/?series=61703&rev=1

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