const char * dmac_id =STM_DMAC_ID;
	const char * lb_cap_channel = STM_DMA_CAP_LOW_BW;
	const char * hb_cap_channel = STM_DMA_CAP_HIGH_BW;
	struct stm_dma_params dmap;

	if(chip->fdma_channel <0){
			if((err=request_dma_bycap(&dmac_id,&hb_cap_channel,"STB7100_PCM_DMA"))<0){
				if((err=request_dma_bycap(&dmac_id,&lb_cap_channel,"STB7100_PCM_DMA"))<0){
					return -ENODEV;
				}
			}
			chip->fdma_channel= err;
	}

	declare_dma_parms(
					&dmap,
					MODE_PACED,
					STM_DMA_LIST_CIRC,
					STM_DMA_SETUP_CONTEXT_TASK,
					STM_DMA_NOBLOCK_MODE,
			     	(char*)STM_DMAC_ID);

	chip->buffer_start_addr = (unsigned long)runtime->dma_addr;

	dma_parms_paced(&dmap,
			snd_pcm_lib_buffer_bytes(substream),
			chip->fdma_req);

	dma_parms_addrs(&dmap,runtime->dma_addr,
			virt_to_phys(chip->pcm_player+STM_PCMP_DATA_FIFO),
			snd_pcm_lib_buffer_bytes(substream));

	dma_compile_list(&dmap);
	chip->dmap = dmap;
	/*play the audio...*/
	int res = dma_xfer_list(chip->fdma_channel,&chip->dmap);

	
	/*now stop*/
		dma_stop_channel(chip->fdma_channel);
	dma_free_descriptor(&chip->dmap);
	dma_free((chip->fdma_channel);
	return err;