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authorCaesar Wang <wxt@rock-chips.com>2016-02-25 04:00:53 +0300
committerVinod Koul <vinod.koul@intel.com>2016-03-01 06:41:25 +0300
commit0a18f9b268dd66c84c806a74b3bc0be6438e7ba7 (patch)
treeb2a9ba71a1070d2917d458d53b33a0eaa434f4ad /drivers/dma
parent80abf8880cc6e1594c11b7c417f22dde60e25312 (diff)
downloadlinux-0a18f9b268dd66c84c806a74b3bc0be6438e7ba7.tar.xz
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 <dinguyen@opensource.altera.com> Signed-off-by: Caesar Wang <wxt@rock-chips.com> Tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/pl330.c9
1 files 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);
}