Commit 89d03b3c authored May 06, 2019 by Eric Long Committed by Vinod Koul May 21, 2019

dmaengine: sprd: Fix block length overflow



The maximum value of block length is 0xffff, so if the configured transfer length
is more than 0xffff, that will cause block length overflow to lead a configuration
error.

Thus we can set block length as the maximum burst length to avoid this issue, since
the maximum burst length will not be a big value which is more than 0xffff.

Signed-off-by: Eric Long <eric.long@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

parent 3d626a97

drivers/dma/sprd-dma.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -778,7 +778,7 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
		temp \|= slave_cfg->src_maxburst & SPRD_DMA_FRG_LEN_MASK;
		hw->frg_len = temp;

		hw->blk_len = len & SPRD_DMA_BLK_LEN_MASK;
		hw->blk_len = slave_cfg->src_maxburst & SPRD_DMA_BLK_LEN_MASK;
		hw->trsc_len = len & SPRD_DMA_TRSC_LEN_MASK;

		temp = (dst_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_DEST_TRSF_STEP_OFFSET;

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