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| author | Daniel Silsby <dansilsby@gmail.com> | 2018-08-30 00:32:53 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2018-09-11 10:29:26 +0300 |
| commit | 5a6187d70f7fc0b55db49af4b2a0f35f34efd770 (patch) | |
| tree | 6440ad852b82e3f927fb2f36454c73f171f74c3c /drivers | |
| parent | 17a8e30e9daf7f65e06a899d37a043c081334e5d (diff) | |
| download | linux-5a6187d70f7fc0b55db49af4b2a0f35f34efd770.tar.xz | |
dmaengine: dma-jz4780: Add missing residue DTC mask
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 <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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/dma-jz4780.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c index 3a4d0a4b550d..bd3cecb800c5 100644 --- a/drivers/dma/dma-jz4780.c +++ b/drivers/dma/dma-jz4780.c @@ -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, |