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@xxxxxxxxxx> --- drivers/dma/zx296702_dma.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/dma/zx296702_dma.c b/drivers/dma/zx296702_dma.c index 0d55c8f..103691c6 100644 --- a/drivers/dma/zx296702_dma.c +++ b/drivers/dma/zx296702_dma.c @@ -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; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
