TRANSCONF_GAMMA_MODE_MASK_ILK
pipe_config->gamma_mode = REG_FIELD_GET(TRANSCONF_GAMMA_MODE_MASK_ILK, tmp);
#define TRANSCONF_GAMMA_MODE_12BIT REG_FIELD_PREP(TRANSCONF_GAMMA_MODE_MASK_ILK, 2) /* ilk-ivb */
#define TRANSCONF_GAMMA_MODE_SPLIT REG_FIELD_PREP(TRANSCONF_GAMMA_MODE_MASK_ILK, 3) /* ivb */
#define TRANSCONF_GAMMA_MODE(x) REG_FIELD_PREP(TRANSCONF_GAMMA_MODE_MASK_ILK, (x)) /* pass in GAMMA_MODE_MODE_* */