From 6fbe24da828ff344372c38441156caefc4a51b3e Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Thu, 29 Aug 2013 18:05:40 -0500 Subject: [PATCH] dma: edma: Setup parameters to DMA MAX_NR_SG at a time Changes are made here for configuring existing parameters to support DMA'ing them out in batches as needed. Also allocate as many as slots as needed by the SG list, but not more than MAX_NR_SG. Then these slots will be reused accordingly. For ex, if MAX_NR_SG=10, and number of SG entries is 40, still only 10 slots will be allocated to DMA the entire SG list of size 40. Also enable TC interrupts for slots that are a last in a current iteration, or that fall on a MAX_NR_SG boundary. Signed-off-by: Joel Fernandes Signed-off-by: Vinod Koul --- drivers/dma/edma.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 4f6d87bcaa0d..f9075129d27c 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -222,9 +222,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( enum dma_slave_buswidth dev_width; u32 burst; struct scatterlist *sg; - int i; int acnt, bcnt, ccnt, src, dst, cidx; int src_bidx, dst_bidx, src_cidx, dst_cidx; + int i, nslots; if (unlikely(!echan || !sgl || !sg_len)) return NULL; @@ -262,8 +262,10 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( edesc->pset_nr = sg_len; - for_each_sg(sgl, sg, sg_len, i) { - /* Allocate a PaRAM slot, if needed */ + /* Allocate a PaRAM slot, if needed */ + nslots = min_t(unsigned, MAX_NR_SG, sg_len); + + for (i = 0; i < nslots; i++) { if (echan->slot[i] < 0) { echan->slot[i] = edma_alloc_slot(EDMA_CTLR(echan->ch_num), @@ -273,6 +275,10 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( return NULL; } } + } + + /* Configure PaRAM sets for each SG */ + for_each_sg(sgl, sg, sg_len, i) { acnt = dev_width; @@ -330,6 +336,12 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( /* Configure A or AB synchronized transfers */ if (edesc->absync) edesc->pset[i].opt |= SYNCDIM; + + /* If this is the last in a current SG set of transactions, + enable interrupts so that next set is processed */ + if (!((i+1) % MAX_NR_SG)) + edesc->pset[i].opt |= TCINTEN; + /* If this is the last set, enable completion interrupt flag */ if (i == sg_len - 1) edesc->pset[i].opt |= TCINTEN;