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host: Add more comments to host callback 

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
This commit is contained in:
Liam Girdwood 2017-03-02 12:00:29 +00:00
parent bfcf15ef41
commit 2a0f0ea62b
1 changed files with 6 additions and 0 deletions
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6
src/audio/host.c
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@ -166,6 +166,7 @@ static void host_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next)
}
}
/* update src and dest positions and check for overflow */
local_elem->src += local_elem->size;
local_elem->dest += local_elem->size;
if (local_elem->src == hd->source->current_end) {
@ -181,16 +182,20 @@ static void host_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next)
local_elem->dest = sink_elem->dest;
}
/* calc size of next transfer */
next_size = hd->period->size;
if (local_elem->src + next_size > hd->source->current_end)
next_size = hd->source->current_end - local_elem->src;
if (local_elem->dest + next_size > hd->sink->current_end)
next_size = hd->sink->current_end - local_elem->dest;
/* are we dealing with a split transfer ? */
if (!hd->split_remaining) {
/* no, is next transfer split ? */
if (next_size != hd->period->size)
hd->split_remaining = hd->period->size - next_size;
} else {
/* yes, than calc transfer size */
need_copy = 1;
next_size = next_size < hd->split_remaining ?
next_size : hd->split_remaining;
@ -198,6 +203,7 @@ static void host_dma_cb(void *data, uint32_t type, struct dma_sg_elem *next)
}
local_elem->size = next_size;
/* schedule immediate split transfer if needed */
if (need_copy) {
next->src = local_elem->src;
next->dest = local_elem->dest;