vlv_nc_read
u32 vlv_nc_read(struct drm_i915_private *dev_priv, u8 addr);
val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FREQ_FUSE);
val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FREQ_FUSE);
val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FMAX_FUSE_LO);
val = vlv_nc_read(dev_priv, IOSF_NC_FB_GFX_FMAX_FUSE_HI);