IPU_CHA_BUF0_RDY
reg = ipu_cm_read(ipu, IPU_CHA_BUF0_RDY(channel->num));
ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF0_RDY(chno));
ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF0_RDY(chno));
if (ipu_cm_read(ipu, IPU_CHA_BUF0_RDY(channel->num)) &
IPU_CHA_BUF0_RDY(channel->num));