On 07-08-18, 13:42, Paul Cercueil wrote: > From: Daniel Silsby <[email protected]> > > 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]> > --- > drivers/dma/dma-jz4780.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > 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 3a4d0a4b550d..a4292ac4c686 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 & 0xffffff) <<
GENMASK(23, 0) please. -- ~Vinod
