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ASoC: Add delay information for Samsung IISv2 DAIs 

Report the current FIFO depth when delay is queried. The FIFO is only
16 frames deep so the latency will be at most a couple of miliseconds
(and we tend to end up reporting zero most of the time) but it may
help some applications.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2010-03-04 14:54:40 +00:00
parent 913d7b4cc0
commit 1ca7578043
1 changed files with 19 additions and 0 deletions
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19
sound/soc/s3c24xx/s3c-i2s-v2.c
View File

@ -550,6 +550,21 @@ static int s3c2412_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
return 0;
}
static snd_pcm_sframes_t s3c2412_i2s_delay(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct s3c_i2sv2_info *i2s = to_info(dai);
u32 reg = readl(i2s->regs + S3C2412_IISFIC);
snd_pcm_sframes_t delay;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
delay = S3C2412_IISFIC_TXCOUNT(reg);
else
delay = S3C2412_IISFIC_RXCOUNT(reg);
return delay;
}
/* default table of all avaialable root fs divisors */
static unsigned int iis_fs_tab[] = { 256, 512, 384, 768 };
@ -736,6 +751,10 @@ int s3c_i2sv2_register_dai(struct snd_soc_dai *dai)
ops->set_fmt = s3c2412_i2s_set_fmt;
ops->set_clkdiv = s3c2412_i2s_set_clkdiv;
/* Allow overriding by (for example) IISv4 */
if (!ops->delay)
ops->delay = s3c2412_i2s_delay,
dai->suspend = s3c2412_i2s_suspend;
dai->resume = s3c2412_i2s_resume;