From 8e8805d5bf704f24acb14d67d506cbd4c5893be5 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 8 Jul 2014 13:46:38 +0300 Subject: [PATCH] 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 Signed-off-by: Vinod Koul --- drivers/dma/edma.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 54f7408e14ef..3754ffa09f27 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -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); } -- 2.39.5