DISP_ENABLE
dspcntr = DISP_ENABLE;
ret = val & DISP_ENABLE;
intel_de_read(display, DSPCNTR(display, PLANE_A)) & DISP_ENABLE);
intel_de_read(display, DSPCNTR(display, PLANE_B)) & DISP_ENABLE);
intel_de_read(display, DSPCNTR(display, PLANE_C)) & DISP_ENABLE);
vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
plane->enabled = !!(val & DISP_ENABLE);