From 1ca7578043a79d74152774acee0ed6e393134d12 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 4 Mar 2010 14:54:40 +0000 Subject: [PATCH] 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 Acked-by: Liam Girdwood --- sound/soc/s3c24xx/s3c-i2s-v2.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/sound/soc/s3c24xx/s3c-i2s-v2.c b/sound/soc/s3c24xx/s3c-i2s-v2.c index e994d8374fe6..aa84f4cb4d8a 100644 --- a/sound/soc/s3c24xx/s3c-i2s-v2.c +++ b/sound/soc/s3c24xx/s3c-i2s-v2.c @@ -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; -- 2.34.1