drm/amdgpu/dce8: Re-set VBLANK interrupt state when enabling a CRTC
Something (ATOM BIOS?) seems to be clobbering the LB_INTERRUPT_MASK register while the CRTC is off, which caused e.g. glxgears or gnome-shell to hang after a modeset. Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com> Reviewed-by: NJammy Zhou <Jammy.Zhou@amd.com>
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