leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dmaengine: at_xdmac: handle numf > 1

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/dma/at_xdmac.c
View File

@ -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_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *prev = NULL, *first = NULL; struct at_xdmac_desc *prev = NULL, *first = NULL;
struct data_chunk *chunk, *prev_chunk = NULL;
dma_addr_t dst_addr, src_addr; dma_addr_t dst_addr, src_addr;
size_t dst_skip, src_skip, len = 0; size_t src_skip = 0, dst_skip = 0, len = 0;
size_t prev_dst_icg = 0, prev_src_icg = 0; struct data_chunk *chunk;
int i; 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; return NULL;
dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n", dev_dbg(chan2dev(chan), "%s: src=0x%08x, dest=0x%08x, numf=%d, frame_size=%d, flags=0x%lx\n",
@ -945,9 +951,17 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
src_addr = xt->src_start; src_addr = xt->src_start;
dst_addr = xt->dst_start; dst_addr = xt->dst_start;
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++) { for (i = 0; i < xt->frame_size; i++) {
size_t src_icg = 0, dst_icg = 0;
struct at_xdmac_desc *desc; struct at_xdmac_desc *desc;
size_t src_icg, dst_icg;
chunk = xt->sgl + i; chunk = xt->sgl + i;
@ -961,22 +975,6 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
"%s: chunk size=%d, src icg=%d, dst icg=%d\n", "%s: chunk size=%d, src icg=%d, dst icg=%d\n",
__func__, chunk->size, src_icg, dst_icg); __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;
}
desc = at_xdmac_interleaved_queue_desc(chan, atchan, desc = at_xdmac_interleaved_queue_desc(chan, atchan,
prev, prev,
src_addr, dst_addr, src_addr, dst_addr,
@ -1001,11 +999,9 @@ at_xdmac_prep_interleaved(struct dma_chan *chan,
dst_addr += dst_skip; dst_addr += dst_skip;
len += chunk->size; len += chunk->size;
prev_chunk = chunk;
prev_dst_icg = dst_icg;
prev_src_icg = src_icg;
prev = desc; prev = desc;
} }
}
first->tx_dma_desc.cookie = -EBUSY; first->tx_dma_desc.cookie = -EBUSY;
first->tx_dma_desc.flags = flags; first->tx_dma_desc.flags = flags;