SKL_PS_CTRL
I915_WRITE(SKL_PS_CTRL(intel_crtc->pipe, id), 0);
I915_WRITE(SKL_PS_CTRL(pipe, id), PS_SCALER_EN |
ps_ctrl = I915_READ(SKL_PS_CTRL(crtc->pipe, i));
I915_WRITE_FW(SKL_PS_CTRL(pipe, scaler_id),