hdmi_reg_write_buf
hdmi_reg_write_buf(hdata, HDMI_AUI_HEADER0, buf, len);
hdmi_reg_write_buf(hdata, HDMI_AVI_HEADER0, buf, ret);
hdmi_reg_write_buf(hdata, HDMI_VSI_HEADER0, buf, 3);
hdmi_reg_write_buf(hdata, HDMI_VSI_DATA(0), buf + 3, ret - 3);