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ASoC: omap-mcbsp: Save, and use wlen for threshold configuration 

Save the word length configuration of McBSP, and use that information
to calculate, and configure the threshold in McBSP.
Previously the calculation was only correct when the stream had 16bit
audio.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolsfonmicro.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Peter Ujfalusi 2010-06-03 07:39:35 +03:00 committed by Liam Girdwood
parent f10b8ad15f
commit 3f024039e0
1 changed files with 9 additions and 5 deletions
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14
sound/soc/omap/omap-mcbsp.c
View File

@ -59,6 +59,7 @@ struct omap_mcbsp_data {
int configured;
unsigned int in_freq;
int clk_div;
int wlen;
};
#define to_mcbsp(priv) container_of((priv), struct omap_mcbsp_data, bus_id)
@ -155,19 +156,21 @@ static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream)
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
int dma_op_mode = omap_mcbsp_get_dma_op_mode(mcbsp_data->bus_id);
int samples;
int words;
/* TODO: Currently, MODE_ELEMENT == MODE_FRAME */
if (dma_op_mode == MCBSP_DMA_MODE_THRESHOLD)
samples = snd_pcm_lib_period_bytes(substream) >> 1;
/* The FIFO size depends on the McBSP word configuration */
words = snd_pcm_lib_period_bytes(substream) /
(mcbsp_data->wlen / 8);
else
samples = 1;
words = 1;
/* Configure McBSP internal buffer usage */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
omap_mcbsp_set_tx_threshold(mcbsp_data->bus_id, samples - 1);
omap_mcbsp_set_tx_threshold(mcbsp_data->bus_id, words);
else
omap_mcbsp_set_rx_threshold(mcbsp_data->bus_id, samples - 1);
omap_mcbsp_set_rx_threshold(mcbsp_data->bus_id, words);
}
static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
@ -409,6 +412,7 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
}
omap_mcbsp_config(bus_id, &mcbsp_data->regs);
mcbsp_data->wlen = wlen;
mcbsp_data->configured = 1;
return 0;