PF_CTL
I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3 |
I915_WRITE(PF_CTL(pipe), PF_ENABLE | PF_FILTER_MED_3x3);
I915_WRITE(PF_CTL(pipe), 0);
tmp = I915_READ(PF_CTL(crtc->pipe));