csi2_try_format
csi2_try_format(csi2, sd_state, fmt->pad, &fmt->format, fmt->which);
csi2_try_format(csi2, sd_state, CSI2_PAD_SOURCE, format,
csi2_try_format(csi2, sd_state, fse->pad, &format, fse->which);
csi2_try_format(csi2, sd_state, fse->pad, &format, fse->which);