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dmaengine: dma-jz4780: Simplify jz4780_dma_desc_residue() 

Simple cleanup, no changes to actual logic here.

Signed-off-by: Daniel Silsby <dansilsby@gmail.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Daniel Silsby 2018-08-29 23:32:54 +02:00 committed by Vinod Koul
parent 5a6187d70f
commit f3c045dffe
1 changed files with 5 additions and 10 deletions
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15
drivers/dma/dma-jz4780.c
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@ -610,22 +610,17 @@ static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan,
struct jz4780_dma_desc *desc, unsigned int next_sg) struct jz4780_dma_desc *desc, unsigned int next_sg)
{ {
struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan); struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
unsigned int residue, count; unsigned int count = 0;
unsigned int i; unsigned int i;
residue = 0;
for (i = next_sg; i < desc->count; i++) for (i = next_sg; i < desc->count; i++)
residue += (desc->desc[i].dtc & GENMASK(23, 0)) << count += desc->desc[i].dtc & GENMASK(23, 0);
jzchan->transfer_shift;
if (next_sg != 0) { if (next_sg != 0)
count = jz4780_dma_chn_readl(jzdma, jzchan->id, count += jz4780_dma_chn_readl(jzdma, jzchan->id,
JZ_DMA_REG_DTC); JZ_DMA_REG_DTC);
residue += count << jzchan->transfer_shift;
}
return residue; return count << jzchan->transfer_shift;
} }
static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan, static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan,