CSC_BG
regval[3] = CVAL(csc->m[CSC_BR], csc->m[CSC_BG]);
cpr->m[CSC_BG] = dispc_S31_32_to_s2_8(ctm->matrix[7]);
regval[0] = CVAL(csc->m[CSC_BB], csc->m[CSC_BG], csc->m[CSC_BR]);
cpr->m[CSC_BG] = dispc_S31_32_to_s3_8(ctm->matrix[7]);