PLANE_CTL_ASYNC_FLIP
plane_ctl |= PLANE_CTL_ASYNC_FLIP;
plane_ctl |= PLANE_CTL_ASYNC_FLIP;
if (vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) & PLANE_CTL_ASYNC_FLIP)
if (vgpu_vreg_t(vgpu, SPRCTL(pipe)) & PLANE_CTL_ASYNC_FLIP)