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We need that in amdgpu_dri2_drawable_crtc as well for priv->vblank_delta to work as intended. amdgpu_dri2_get_msc was already doing this. Fixes hangs in some cases when using VDPAU via DRI2 and moving the window between CRTCs. Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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