drm_scdc_readb
ret = drm_scdc_readb(connector->ddc, SCDC_SCRAMBLER_STATUS, &status);
ret = drm_scdc_readb(connector->ddc, SCDC_TMDS_CONFIG, &config);
ret = drm_scdc_readb(connector->ddc, SCDC_TMDS_CONFIG, &config);
ret = drm_scdc_readb(ddc, SCDC_TMDS_CONFIG, &config);