PIPEGCMAX
intel_de_write_fw(display, PIPEGCMAX(display, pipe, 0), lut[i].red);
intel_de_write_fw(display, PIPEGCMAX(display, pipe, 1), lut[i].green);
intel_de_write_fw(display, PIPEGCMAX(display, pipe, 2), lut[i].blue);
lut[i].red = i965_lut_11p6_max_pack(intel_de_read_fw(display, PIPEGCMAX(display, pipe, 0)));
lut[i].green = i965_lut_11p6_max_pack(intel_de_read_fw(display, PIPEGCMAX(display, pipe, 1)));
lut[i].blue = i965_lut_11p6_max_pack(intel_de_read_fw(display, PIPEGCMAX(display, pipe, 2)));