| Message ID | b862c3ac7d268e08c3052e245df4c3024f12d7f5.1461307982.git.moinejf@free.fr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Apr 22, 2016 at 08:48:40AM +0200, Jean-Francois Moine wrote: > 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> > --- > drivers/dma/sun6i-dma.c | 23 +++++++++++++++++++---- > 1 file changed, 19 insertions(+), 4 deletions(-) > > diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > index b08245e..821fc4f 100644 > --- a/drivers/dma/sun6i-dma.c > +++ b/drivers/dma/sun6i-dma.c > @@ -470,10 +470,25 @@ 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); > + if (direction == 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); > + } else { /* DMA_DEV_TO_MEM */ Else can be any other direction, I would prefer we check that. Also swicth would be better > + 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); > + } > > if (src_burst < 0) > return src_burst;
diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index b08245e..821fc4f 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -470,10 +470,25 @@ 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); + if (direction == 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); + } else { /* 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); + } if (src_burst < 0) return src_burst;
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> --- drivers/dma/sun6i-dma.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)