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ASoC: fsi: reserve prefetch period on DMA transferring

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Current FSI is supporting DMAEngine transfer,
but, it needs to use work queue.
Therefore, DMA transfer settings might be late if there is heavy task.
This patch reserves next period beforehand on DMA transfer function.
Android sound will be breaking up without this patch.

Tested-by: Tomohito Esaki <etom@igel.co.jp>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Kuninori Morimoto 2013-08-25 23:36:23 -07:00 committed by Mark Brown
parent b36f4be3de
commit 53110a256a
1 changed files with 35 additions and 20 deletions
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55
sound/soc/sh/fsi.c
View file

@ -235,6 +235,8 @@ struct fsi_stream {
struct sh_dmae_slave slave; /* see fsi_handler_init() */
struct work_struct work;
dma_addr_t dma;
int loop_cnt;
int additional_pos;
};
struct fsi_clk {
@ -1289,6 +1291,8 @@ static int fsi_dma_init(struct fsi_priv *fsi, struct fsi_stream *io)
io->bus_option = BUSOP_SET(24, PACKAGE_24BITBUS_BACK) |
BUSOP_SET(16, PACKAGE_16BITBUS_STREAM);
io->loop_cnt = 2; /* push 1st, 2nd period first, then 3rd, 4th... */
io->additional_pos = 0;
io->dma = dma_map_single(dai->dev, runtime->dma_area,
snd_pcm_lib_buffer_bytes(io->substream), dir);
return 0;
@ -1305,11 +1309,15 @@ static int fsi_dma_quit(struct fsi_priv *fsi, struct fsi_stream *io)
return 0;
}
static dma_addr_t fsi_dma_get_area(struct fsi_stream *io)
static dma_addr_t fsi_dma_get_area(struct fsi_stream *io, int additional)
{
struct snd_pcm_runtime *runtime = io->substream->runtime;
int period = io->period_pos + additional;
return io->dma + samples_to_bytes(runtime, io->buff_sample_pos);
if (period >= runtime->periods)
period = 0;
return io->dma + samples_to_bytes(runtime, period * io->period_samples);
}
static void fsi_dma_complete(void *data)
@ -1321,7 +1329,7 @@ static void fsi_dma_complete(void *data)
enum dma_data_direction dir = fsi_stream_is_play(fsi, io) ?
DMA_TO_DEVICE : DMA_FROM_DEVICE;
dma_sync_single_for_cpu(dai->dev, fsi_dma_get_area(io),
dma_sync_single_for_cpu(dai->dev, fsi_dma_get_area(io, 0),
samples_to_bytes(runtime, io->period_samples), dir);
io->buff_sample_pos += io->period_samples;
@ -1347,7 +1355,7 @@ static void fsi_dma_do_work(struct work_struct *work)
struct snd_pcm_runtime *runtime;
enum dma_data_direction dir;
int is_play = fsi_stream_is_play(fsi, io);
int len;
int len, i;
dma_addr_t buf;
if (!fsi_stream_is_working(fsi, io))
@ -1357,26 +1365,33 @@ static void fsi_dma_do_work(struct work_struct *work)
runtime = io->substream->runtime;
dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
len = samples_to_bytes(runtime, io->period_samples);
buf = fsi_dma_get_area(io);
dma_sync_single_for_device(dai->dev, buf, len, dir);
for (i = 0; i < io->loop_cnt; i++) {
buf = fsi_dma_get_area(io, io->additional_pos);
desc = dmaengine_prep_slave_single(io->chan, buf, len, dir,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(dai->dev, "dmaengine_prep_slave_sg() fail\n");
return;
dma_sync_single_for_device(dai->dev, buf, len, dir);
desc = dmaengine_prep_slave_single(io->chan, buf, len, dir,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(dai->dev, "dmaengine_prep_slave_sg() fail\n");
return;
}
desc->callback = fsi_dma_complete;
desc->callback_param = io;
if (dmaengine_submit(desc) < 0) {
dev_err(dai->dev, "tx_submit() fail\n");
return;
}
dma_async_issue_pending(io->chan);
io->additional_pos = 1;
}
desc->callback = fsi_dma_complete;
desc->callback_param = io;
if (dmaengine_submit(desc) < 0) {
dev_err(dai->dev, "tx_submit() fail\n");
return;
}
dma_async_issue_pending(io->chan);
io->loop_cnt = 1;
/*
* FIXME