DDI_DP_COMP_PAT
intel_de_write(display, DDI_DP_COMP_PAT(pipe, 0), pattern_val);
intel_de_write(display, DDI_DP_COMP_PAT(pipe, 1), pattern_val);
intel_de_write(display, DDI_DP_COMP_PAT(pipe, 2), pattern_val);