From 0a18f9b268dd66c84c806a74b3bc0be6438e7ba7 Mon Sep 17 00:00:00 2001 From: Caesar Wang Date: Thu, 25 Feb 2016 09:00:53 +0800 Subject: [PATCH] dmaengine: pl330: fix to support the burst mode This patch fixes the burst mode that will break DMA uart on SoCFPGA. In some cases, some SoCS didn't support the multi-burst even if the devices who use the pl330 claim support the maxburst. Fixes: commit 848e977 "dmaengine: pl330: support burst mode for dev-to-mem and mem-to-dev transmit" Reported-by: Dinh Nguyen Signed-off-by: Caesar Wang Tested-by: Bartlomiej Zolnierkiewicz Tested-by: Dinh Nguyen Signed-off-by: Vinod Koul --- drivers/dma/pl330.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 1b0453b9e32d..372b4359da97 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -1161,7 +1161,7 @@ static inline int _ldst_devtomem(struct pl330_dmac *pl330, unsigned dry_run, if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) cond = BURST; else - cond = (pxs->desc->rqcfg.brst_len == 1) ? SINGLE : BURST; + cond = SINGLE; while (cyc--) { off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri); @@ -1186,8 +1186,7 @@ static inline int _ldst_memtodev(struct pl330_dmac *pl330, if (pl330->quirks & PL330_QUIRK_BROKEN_NO_FLUSHP) cond = BURST; else - cond = (pxs->desc->rqcfg.brst_len == 1) ? SINGLE : BURST; - + cond = SINGLE; while (cyc--) { off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri); @@ -2598,7 +2597,7 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic( desc->rqtype = direction; desc->rqcfg.brst_size = pch->burst_sz; - desc->rqcfg.brst_len = pch->burst_len; + desc->rqcfg.brst_len = 1; desc->bytes_requested = period_len; fill_px(&desc->px, dst, src, period_len); @@ -2743,7 +2742,7 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, } desc->rqcfg.brst_size = pch->burst_sz; - desc->rqcfg.brst_len = pch->burst_len; + desc->rqcfg.brst_len = 1; desc->rqtype = direction; desc->bytes_requested = sg_dma_len(sg); } -- 2.39.5