DISP_FBC_WM_DIS
val &= ~DISP_FBC_WM_DIS;
val |= DISP_FBC_WM_DIS;
!(I915_READ(DISP_ARB_CTL) & DISP_FBC_WM_DIS);
DISP_FBC_WM_DIS |
DISP_FBC_WM_DIS));