From 76f471274dc9acacd521f151ac9171fd7bbc34c3 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Fri, 23 Apr 2010 10:10:00 +0300 Subject: [PATCH] ASoC: tlv320dac33: Calculate the interface speed during bursts When the DAC33 FIFO is in use the dai interface is running in much higher speed than the sampling frequency. Calculate the rate based on the internal base frequency and the bclk divider. Signed-off-by: Peter Ujfalusi Acked-by: Mark Brown Signed-off-by: Liam Girdwood --- sound/soc/codecs/tlv320dac33.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/soc/codecs/tlv320dac33.c b/sound/soc/codecs/tlv320dac33.c index fa19942..a8eb19b 100644 --- a/sound/soc/codecs/tlv320dac33.c +++ b/sound/soc/codecs/tlv320dac33.c @@ -53,6 +53,8 @@ #define MODE7_LTHR 10 #define MODE7_UTHR (DAC33_BUFFER_SIZE_SAMPLES - 10) +#define BURST_BASEFREQ_HZ 49152000 + static struct snd_soc_codec *tlv320dac33_codec; enum dac33_state { @@ -95,6 +97,7 @@ struct tlv320dac33_priv { enum dac33_fifo_modes fifo_mode;/* FIFO mode selection */ unsigned int nsample; /* burst read amount from host */ u8 burst_bclkdiv; /* BCLK divider value in burst mode */ + unsigned int burst_rate; /* Interface speed in Burst modes */ int keep_bclk; /* Keep the BCLK continuously running * in FIFO modes */ @@ -1246,6 +1249,8 @@ static int __devinit dac33_i2c_probe(struct i2c_client *client, dac33->power_gpio = pdata->power_gpio; dac33->burst_bclkdiv = pdata->burst_bclkdiv; + /* Pre calculate the burst rate */ + dac33->burst_rate = BURST_BASEFREQ_HZ / dac33->burst_bclkdiv / 32; dac33->keep_bclk = pdata->keep_bclk; dac33->irq = client->irq; dac33->nsample = NSAMPLE_MAX; -- 2.7.4