Commit a4eb36b0 authored by Jean-Francois Moine's avatar Jean-Francois Moine Committed by Vinod Koul
Browse files

dmaengine: sun6i: Set default maxburst size and bus width 



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: default avatarJean-Francois Moine <moinejf@free.fr>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 52c87179

drivers/dma/sun6i-dma.c

+24 −4
Original line number Diff line number Diff line
@@ -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);

	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;

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