pcc_chan_reg_read_modify_write
pcc_chan_reg_read_modify_write(&pchan->cmd_update);
pcc_chan_reg_read_modify_write(&pchan->db);
if (pcc_chan_reg_read_modify_write(&pchan->plat_irq_ack))
ret = pcc_chan_reg_read_modify_write(&pchan->cmd_update);
ret = pcc_chan_reg_read_modify_write(&pchan->db);