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dmaengine: at_xdmac: handle numf > 1 

Handle 'numf > 1' case for interleaved mode.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2015-09-15 15:29:27 +02:00 committed by Vinod Koul
parent 1a492ac2b8
commit 4e5385784e
1 changed files with 54 additions and 58 deletions
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112
drivers/dma/at_xdmac.c
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@ -929,13 +929,19 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
{
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *prev = NULL, *first = NULL;
struct data_chunk *chunk, *prev_chunk = NULL;
dma_addr_t dst_addr, src_addr;
size_t dst_skip, src_skip, len = 0;
size_t prev_dst_icg = 0, prev_src_icg = 0;
size_t src_skip = 0, dst_skip = 0, len = 0;
struct data_chunk *chunk;
int i;
if (!xt || (xt->numf != 1) || (xt->dir != DMA_MEM_TO_MEM))
if (!xt || !xt->numf || (xt->dir != DMA_MEM_TO_MEM))
return NULL;
/*
* TODO: Handle the case where we have to repeat a chain of
* descriptors...
*/
if ((xt->numf > 1) && (xt->frame_size > 1))
return NULL;
dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
@ -945,66 +951,56 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
src_addr = xt->src_start;
dst_addr = xt->dst_start;
for (i = 0; i < xt->frame_size; i++) {
struct at_xdmac_desc *desc;
size_t src_icg, dst_icg;
if (xt->numf > 1) {
first = at_xdmac_interleaved_queue_desc(chan, atchan,
NULL,
src_addr, dst_addr,
xt, xt->sgl);
for (i = 0; i < xt->numf; i++)
at_xdmac_increment_block_count(chan, first);
} else {
for (i = 0; i < xt->frame_size; i++) {
size_t src_icg = 0, dst_icg = 0;
struct at_xdmac_desc *desc;
chunk = xt->sgl + i;
chunk = xt->sgl + i;
dst_icg = dmaengine_get_dst_icg(xt, chunk);
src_icg = dmaengine_get_src_icg(xt, chunk);
dst_icg = dmaengine_get_dst_icg(xt, chunk);
src_icg = dmaengine_get_src_icg(xt, chunk);
src_skip = chunk->size + src_icg;
dst_skip = chunk->size + dst_icg;
src_skip = chunk->size + src_icg;
dst_skip = chunk->size + dst_icg;
dev_dbg(chan2dev(chan),
"%s: chunk size=%d, src icg=%d, dst icg=%d\n",
__func__, chunk->size, src_icg, dst_icg);
/*
* Handle the case where we just have the same
* transfer to setup, we can just increase the
* block number and reuse the same descriptor.
*/
if (prev_chunk && prev &&
(prev_chunk->size == chunk->size) &&
(prev_src_icg == src_icg) &&
(prev_dst_icg == dst_icg)) {
dev_dbg(chan2dev(chan),
"%s: same configuration that the previous chunk, merging the descriptors...\n",
__func__);
at_xdmac_increment_block_count(chan, prev);
continue;
"%s: chunk size=%d, src icg=%d, dst icg=%d\n",
__func__, chunk->size, src_icg, dst_icg);
desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev,
src_addr, dst_addr,
xt, chunk);
if (!desc) {
list_splice_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
if (xt->src_sgl)
src_addr += src_skip;
if (xt->dst_sgl)
dst_addr += dst_skip;
len += chunk->size;
prev = desc;
}
desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev,
src_addr, dst_addr,
xt, chunk);
if (!desc) {
list_splice_init(&first->descs_list,
&atchan->free_descs_list);
return NULL;
}
if (!first)
first = desc;
dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n",
__func__, desc, first);
list_add_tail(&desc->desc_node, &first->descs_list);
if (xt->src_sgl)
src_addr += src_skip;
if (xt->dst_sgl)
dst_addr += dst_skip;
len += chunk->size;
prev_chunk = chunk;
prev_dst_icg = dst_icg;
prev_src_icg = src_icg;
prev = desc;
}
first->tx_dma_desc.cookie = -EBUSY;