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dmaengine: dma-jz4780: Add missing residue DTC mask

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The 'dtc' word in jz DMA descriptors contains two fields: The
lowest 24 bits are the transfer count, and upper 8 bits are the DOA
offset to next descriptor. The upper 8 bits are now correctly masked
off when computing residue in jz4780_dma_desc_residue(). Note that
reads of the DTCn hardware reg are automatically masked this way.

Signed-off-by: Daniel Silsby <[email protected]>
Signed-off-by: Paul Cercueil <[email protected]>
Tested-by: Mathieu Malaterre <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
This commit is contained in:
Daniel Silsby 2018-08-29 23:32:53 +02:00 • committed by Vinod Koul
commit 5a6187d70f
1 changed files with 2 additions and 1 deletions
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3
drivers/dma/dma-jz4780.c
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@ -616,7 +616,8 @@ static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan,
residue = 0;
for (i = next_sg; i < desc->count; i++)
residue += desc->desc[i].dtc << jzchan->transfer_shift;
residue += (desc->desc[i].dtc & GENMASK(23, 0)) <<
jzchan->transfer_shift;
if (next_sg != 0) {
count = jz4780_dma_chn_readl(jzdma, jzchan->id,