[Bug 79612] [HSW Regression]igt/kms_plane causes "WARNING: CPU: 3 PID: 4404 at drivers/gpu/drm/i915/intel_display.c:888 display_crc_ctl_write+0x563/0x75d [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79612

--- Comment #2 from Daniel Vetter <daniel at ffwll.ch> ---
Created attachment 100439
  --> https://bugs.freedesktop.org/attachment.cgi?id=100439&action=edit
Only vblank wait when necessary.

Please test this patch for all affected testcases, thanks.

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