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ASoC: rsnd: update pointer more accurate

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Current rsnd driver updates pointer when DMA transfer was finished
in DMA transfer mode. But PulseAudio requests more accurate
pointer update when timer mode.
This patch consider about DMA transfer residue and update more
accurate pointer.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kuninori Morimoto
2017-06-07 00:20:01 +00:00
committed by Mark Brown
parent 0d6b35212b
commit 07b7acb51d
4 changed files with 48 additions and 3 deletions
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26
sound/soc/sh/rcar/dma.c
View File

@@ -25,6 +25,7 @@
struct rsnd_dmaen {
struct dma_chan *chan;
dma_cookie_t cookie;
dma_addr_t dma_buf;
unsigned int dma_len;
unsigned int dma_period;
@@ -292,7 +293,8 @@ static int rsnd_dmaen_start(struct rsnd_mod *mod,
for (i = 0; i < 2; i++)
rsnd_dmaen_sync(dmaen, io, i);
if (dmaengine_submit(desc) < 0) {
dmaen->cookie = dmaengine_submit(desc);
if (dmaen->cookie < 0) {
dev_err(dev, "dmaengine_submit() fail\n");
return -EIO;
}
@@ -348,12 +350,34 @@ static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
return 0;
}
static int rsnd_dmaen_pointer(struct rsnd_mod *mod,
struct rsnd_dai_stream *io,
snd_pcm_uframes_t *pointer)
{
struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
struct dma_tx_state state;
enum dma_status status;
unsigned int pos = 0;
status = dmaengine_tx_status(dmaen->chan, dmaen->cookie, &state);
if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
if (state.residue > 0 && state.residue <= dmaen->dma_len)
pos = dmaen->dma_len - state.residue;
}
*pointer = bytes_to_frames(runtime, pos);
return 0;
}
static struct rsnd_mod_ops rsnd_dmaen_ops = {
.name = "audmac",
.nolock_start = rsnd_dmaen_nolock_start,
.nolock_stop = rsnd_dmaen_nolock_stop,
.start = rsnd_dmaen_start,
.stop = rsnd_dmaen_stop,
.pointer= rsnd_dmaen_pointer,
};
/*