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dma: dw-dma: use 32 bit words for non peripheral copies. 

DW-DMA is more optimal using 32bit data size when transferring between
memories. Set configuration to always use 32 bit mode for non peripheral
copies from memory to memory.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
This commit is contained in:
Liam Girdwood 2018-02-09 12:29:08 +00:00
parent 1532dfdad4
commit b0f8e5d5c2
1 changed files with 28 additions and 6 deletions
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26
src/drivers/dw-dma.c
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@ -586,9 +586,20 @@ static int dw_dma_set_config(struct dma *dma, int channel,
/* write CTL_LOn for each lli */
switch (config->src_width) {
case 2:
/* config the src tr width for 16 bit samples */
/* non peripheral copies are optimal using words */
switch (config->direction) {
case DMA_DIR_LMEM_TO_HMEM:
case DMA_DIR_HMEM_TO_LMEM:
case DMA_DIR_MEM_TO_MEM:
/* config the src tr width for 32 bit words */
lli_desc->ctrl_lo |= DW_CTLL_SRC_WIDTH(2);
break;
default:
/* config the src width for 16 bit samples */
lli_desc->ctrl_lo |= DW_CTLL_SRC_WIDTH(1);
break;
}
break;
case 4:
/* config the src tr width for 24, 32 bit samples */
lli_desc->ctrl_lo |= DW_CTLL_SRC_WIDTH(2);
@ -601,9 +612,20 @@ static int dw_dma_set_config(struct dma *dma, int channel,
switch (config->dest_width) {
case 2:
/* config the dest tr width for 16 bit samples */
/* non peripheral copies are optimal using words */
switch (config->direction) {
case DMA_DIR_LMEM_TO_HMEM:
case DMA_DIR_HMEM_TO_LMEM:
case DMA_DIR_MEM_TO_MEM:
/* config the dest tr width for 32 bit words */
lli_desc->ctrl_lo |= DW_CTLL_DST_WIDTH(2);
break;
default:
/* config the dest width for 16 bit samples */
lli_desc->ctrl_lo |= DW_CTLL_DST_WIDTH(1);
break;
}
break;
case 4:
/* config the dest tr width for 24, 32 bit samples */
lli_desc->ctrl_lo |= DW_CTLL_DST_WIDTH(2);