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dmaengine: zxdma: Fix data width bug 

Align src and dst width to fix data alignment issue as
trailing single transaction that does not fill a full
burst require identical src/dst data width.
Burst length limitation can be addressed well too.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Jun Nie 2015-08-05 13:23:26 +08:00 committed by Vinod Koul
parent 2f2560e348
commit 2092539b77
1 changed files with 5 additions and 4 deletions
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9
drivers/dma/zx296702_dma.c
View File

@ -476,15 +476,16 @@ static int zx_pre_config(struct zx_dma_chan *c, enum dma_transfer_direction dir)
c->dev_addr = cfg->dst_addr;
/* dst len is calculated from src width, len and dst width.
* We need make sure dst len not exceed MAX LEN.
* Trailing single transaction that does not fill a full
* burst also require identical src/dst data width.
*/
dst_width = zx_dma_burst_width(cfg->dst_addr_width);
maxburst = cfg->dst_maxburst * cfg->dst_addr_width
/ DMA_SLAVE_BUSWIDTH_8_BYTES;
maxburst = cfg->dst_maxburst;
maxburst = maxburst < ZX_MAX_BURST_LEN ?
maxburst : ZX_MAX_BURST_LEN;
c->ccfg = ZX_DST_FIFO_MODE | ZX_CH_ENABLE
| ZX_SRC_BURST_LEN(maxburst - 1)
| ZX_SRC_BURST_WIDTH(ZX_DMA_WIDTH_64BIT)
| ZX_SRC_BURST_WIDTH(dst_width)
| ZX_DST_BURST_WIDTH(dst_width);
break;
case DMA_DEV_TO_MEM:
@ -496,7 +497,7 @@ static int zx_pre_config(struct zx_dma_chan *c, enum dma_transfer_direction dir)
c->ccfg = ZX_SRC_FIFO_MODE | ZX_CH_ENABLE
| ZX_SRC_BURST_LEN(maxburst - 1)
| ZX_SRC_BURST_WIDTH(src_width)
| ZX_DST_BURST_WIDTH(ZX_DMA_WIDTH_64BIT);
| ZX_DST_BURST_WIDTH(src_width);
break;
default:
return -EINVAL;