[PATCH v4 12/18] dmaengine: dma-jz4780: Simplify jz4780_dma_desc_residue()
From: Paul Cercueil <paul@crapouillou.net>
Date: 2018-08-07 11:43:19
Also in:
dmaengine, linux-devicetree, lkml
Subsystem:
dma generic offload engine subsystem, ingenic jz47xx socs, the rest · Maintainers:
Vinod Koul, Paul Cercueil, Linus Torvalds
From: Daniel Silsby <redacted> Simple cleanup, no changes to actual logic here. Signed-off-by: Daniel Silsby <redacted> Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <redacted> --- drivers/dma/dma-jz4780.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) v2: No change v3: No change v4: Add my Signed-off-by
diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index a4292ac4c686..019cebc2e5e5 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c@@ -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_dev *jzdma = jz4780_dma_chan_parent(jzchan); - unsigned int residue, count; + unsigned int count = 0; unsigned int i; - residue = 0; - for (i = next_sg; i < desc->count; i++) - residue += (desc->desc[i].dtc & 0xffffff) << - jzchan->transfer_shift; + count += desc->desc[i].dtc & 0xffffff; - if (next_sg != 0) { - count = jz4780_dma_chn_readl(jzdma, jzchan->id, + if (next_sg != 0) + count += jz4780_dma_chn_readl(jzdma, jzchan->id, 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,
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2.11.0