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dmaengine: edma: Serve cyclic (audio) channels with high priority queue 

Move the DMA channel used in cyclic mode (audio) to the highest priority
event queue which helps to reduce audio problems.
When the channel is terminated, move it back to the default queue.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2014-07-08 13:46:38 +03:00 committed by Vinod Koul
parent eb3fe7def6
commit 8e8805d5bf
1 changed files with 8 additions and 0 deletions
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8
drivers/dma/edma.c
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@ -256,8 +256,13 @@ static int edma_terminate_all(struct edma_chan *echan)
* echan->edesc is NULL and exit.)
*/
if (echan->edesc) {
int cyclic = echan->edesc->cyclic;
echan->edesc = NULL;
edma_stop(echan->ch_num);
/* Move the cyclic channel back to default queue */
if (cyclic)
edma_assign_channel_eventq(echan->ch_num,
EVENTQ_DEFAULT);
}
vchan_get_all_descriptors(&echan->vchan, &head);
@ -724,6 +729,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
edesc->pset[i].param.opt |= TCINTEN;
}
/* Place the cyclic channel to highest priority queue */
edma_assign_channel_eventq(echan->ch_num, EVENTQ_0);
return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
}