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authorDaniel Silsby <dansilsby@gmail.com>2018-08-29 23:32:53 +0200
committerVinod Koul <vkoul@kernel.org>2018-09-11 12:59:26 +0530
commit5a6187d70f7fc0b55db49af4b2a0f35f34efd770 (patch)
tree6440ad852b82e3f927fb2f36454c73f171f74c3c /drivers/dma/dma-jz4780.c
parent17a8e30e9daf7f65e06a899d37a043c081334e5d (diff)
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/dma/dma-jz4780.c')
-rw-r--r--drivers/dma/dma-jz4780.c3
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,