FW_BLC
intel_de_write(display, FW_BLC, fwater_lo);
fwater_lo = intel_de_read(display, FW_BLC) & ~0xfff;
intel_de_write(display, FW_BLC, fwater_lo);
i810_writel(FW_BLC, mmio, par->watermark);
tmp_long = i810_readl(FW_BLC, mmio);
i810_writel(FW_BLC, mmio, tmp_long);
par->hw_state.fw_blc = i810_readl(FW_BLC, mmio);