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dmaengine: sun6i: Set default maxburst size and bus width

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Some DMA clients, as audio, don't set the maxburst size and bus width
on the memory side when starting DMA transfers.
This patch prevents such transfers to be aborted by providing system
default values to the lacking ones.

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 2016-04-28 17:07:02 +02:00 committed by Vinod Koul
parent 52c871798f
commit a4eb36b02c
1 changed files with 24 additions and 4 deletions
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28
drivers/dma/sun6i-dma.c
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@ -470,10 +470,30 @@ static int set_config(struct sun6i_dma_dev *sdev,
{
s8 src_width, dst_width, src_burst, dst_burst;
src_burst = convert_burst(sconfig->src_maxburst);
src_width = convert_buswidth(sconfig->src_addr_width);
dst_burst = convert_burst(sconfig->dst_maxburst);
dst_width = convert_buswidth(sconfig->dst_addr_width);
switch (direction) {
case DMA_MEM_TO_DEV:
src_burst = convert_burst(sconfig->src_maxburst ?
sconfig->src_maxburst : 8);
src_width = convert_buswidth(sconfig->src_addr_width !=
DMA_SLAVE_BUSWIDTH_UNDEFINED ?
sconfig->src_addr_width :
DMA_SLAVE_BUSWIDTH_4_BYTES);
dst_burst = convert_burst(sconfig->dst_maxburst);
dst_width = convert_buswidth(sconfig->dst_addr_width);
break;
case DMA_DEV_TO_MEM:
src_burst = convert_burst(sconfig->src_maxburst);
src_width = convert_buswidth(sconfig->src_addr_width);
dst_burst = convert_burst(sconfig->dst_maxburst ?
sconfig->dst_maxburst : 8);
dst_width = convert_buswidth(sconfig->dst_addr_width !=
DMA_SLAVE_BUSWIDTH_UNDEFINED ?
sconfig->dst_addr_width :
DMA_SLAVE_BUSWIDTH_4_BYTES);
break;
default:
return -EINVAL;
}
if (src_burst < 0)
return src_burst;