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dmaengine: sun6i: Fix impossible settings of burst and bus width 

In the commit 1f9cd915b6 ("dmaengine: sun6i: Fix memcpy operation"),
the signed values returned by convert_burst() and convert_buswidth()
were stored in an unsigned value.
Then, these values were considered as errors when non null.

As a result, DMA transfers were rejected when the burst or buswidth
had values different from 1, as 8 for the burst or 4 for the bus width.

Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Jean-Francois Moine 2016-04-22 08:17:14 +02:00 committed by Vinod Koul
parent 128fe7e9a0
commit dc6a58c17c
1 changed files with 5 additions and 5 deletions
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10
drivers/dma/sun6i-dma.c
View File

@ -281,25 +281,25 @@ static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli,
dma_addr_t dst, u32 len,
struct dma_slave_config *config)
{
u8 src_width, dst_width, src_burst, dst_burst;
s8 src_width, dst_width, src_burst, dst_burst;
if (!config)
return -EINVAL;
src_burst = convert_burst(config->src_maxburst);
if (src_burst)
if (src_burst < 0)
return src_burst;
dst_burst = convert_burst(config->dst_maxburst);
if (dst_burst)
if (dst_burst < 0)
return dst_burst;
src_width = convert_buswidth(config->src_addr_width);
if (src_width)
if (src_width < 0)
return src_width;
dst_width = convert_buswidth(config->dst_addr_width);
if (dst_width)
if (dst_width < 0)
return dst_width;
lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |