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