diff options
Diffstat (limited to 'sound/soc/codecs/tlv320dac33.c')
| -rw-r--r-- | sound/soc/codecs/tlv320dac33.c | 47 |
1 files changed, 27 insertions, 20 deletions
diff --git a/sound/soc/codecs/tlv320dac33.c b/sound/soc/codecs/tlv320dac33.c index c574ae238973..05a4e9fade47 100644 --- a/sound/soc/codecs/tlv320dac33.c +++ b/sound/soc/codecs/tlv320dac33.c @@ -42,12 +42,15 @@ #include <sound/tlv320dac33-plat.h> #include "tlv320dac33.h" -#define DAC33_BUFFER_SIZE_BYTES 24576 /* bytes, 12288 16 bit words, - * 6144 stereo */ -#define DAC33_BUFFER_SIZE_SAMPLES 6144 - -#define MODE7_LTHR 10 -#define MODE7_UTHR (DAC33_BUFFER_SIZE_SAMPLES - 10) +/* + * The internal FIFO is 24576 bytes long + * It can be configured to hold 16bit or 24bit samples + * In 16bit configuration the FIFO can hold 6144 stereo samples + * In 24bit configuration the FIFO can hold 4096 stereo samples + */ +#define DAC33_FIFO_SIZE_16BIT 6144 +#define DAC33_FIFO_SIZE_24BIT 4096 +#define DAC33_MODE7_MARGIN 10 /* Safety margin for FIFO in Mode7 */ #define BURST_BASEFREQ_HZ 49152000 @@ -98,6 +101,7 @@ struct tlv320dac33_priv { unsigned int alarm_threshold; /* set to be half of LATENCY_TIME_MS */ enum dac33_fifo_modes fifo_mode;/* FIFO mode selection */ + unsigned int fifo_size; /* Size of the FIFO in samples */ unsigned int nsample; /* burst read amount from host */ int mode1_latency; /* latency caused by the i2c writes in * us */ @@ -650,7 +654,7 @@ static inline void dac33_prefill_handler(struct tlv320dac33_priv *dac33) spin_unlock_irq(&dac33->lock); dac33_write16(codec, DAC33_PREFILL_MSB, - DAC33_THRREG(MODE7_LTHR)); + DAC33_THRREG(DAC33_MODE7_MARGIN)); /* Enable Upper Threshold IRQ */ dac33_write(codec, DAC33_FIFO_IRQ_MASK, DAC33_MUT); @@ -773,12 +777,15 @@ static void dac33_shutdown(struct snd_pcm_substream *substream, dac33->substream = NULL; } +#define CALC_BURST_RATE(bclkdiv, bclk_per_sample) \ + (BURST_BASEFREQ_HZ / bclkdiv / bclk_per_sample) static int dac33_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_codec *codec = rtd->codec; + struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec); /* Check parameters for validity */ switch (params_rate(params)) { @@ -793,6 +800,8 @@ static int dac33_hw_params(struct snd_pcm_substream *substream, switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: + dac33->fifo_size = DAC33_FIFO_SIZE_16BIT; + dac33->burst_rate = CALC_BURST_RATE(dac33->burst_bclkdiv, 32); break; default: dev_err(codec->dev, "unsupported format %d\n", @@ -994,7 +1003,8 @@ static int dac33_prepare_chip(struct snd_pcm_substream *substream) * at the bottom, and also at the top of the FIFO */ dac33_write16(codec, DAC33_UTHR_MSB, DAC33_THRREG(dac33->uthr)); - dac33_write16(codec, DAC33_LTHR_MSB, DAC33_THRREG(MODE7_LTHR)); + dac33_write16(codec, DAC33_LTHR_MSB, + DAC33_THRREG(DAC33_MODE7_MARGIN)); break; default: break; @@ -1023,8 +1033,7 @@ static void dac33_calculate_times(struct snd_pcm_substream *substream) /* Number of samples under i2c latency */ dac33->alarm_threshold = US_TO_SAMPLES(rate, dac33->mode1_latency); - nsample_limit = DAC33_BUFFER_SIZE_SAMPLES - - dac33->alarm_threshold; + nsample_limit = dac33->fifo_size - dac33->alarm_threshold; if (period_size <= dac33->alarm_threshold) /* @@ -1048,14 +1057,14 @@ static void dac33_calculate_times(struct snd_pcm_substream *substream) case DAC33_FIFO_MODE7: dac33->uthr = UTHR_FROM_PERIOD_SIZE(period_size, rate, dac33->burst_rate) + 9; - if (dac33->uthr > MODE7_UTHR) - dac33->uthr = MODE7_UTHR; - if (dac33->uthr < (MODE7_LTHR + 10)) - dac33->uthr = (MODE7_LTHR + 10); + if (dac33->uthr > (dac33->fifo_size - DAC33_MODE7_MARGIN)) + dac33->uthr = dac33->fifo_size - DAC33_MODE7_MARGIN; + if (dac33->uthr < (DAC33_MODE7_MARGIN + 10)) + dac33->uthr = (DAC33_MODE7_MARGIN + 10); dac33->mode7_us_to_lthr = SAMPLES_TO_US(substream->runtime->rate, - dac33->uthr - MODE7_LTHR + 1); + dac33->uthr - DAC33_MODE7_MARGIN + 1); dac33->t_stamp1 = 0; break; default: @@ -1173,8 +1182,8 @@ static snd_pcm_sframes_t dac33_dai_delay( samples += (samples_in - samples_out); if (likely(samples > 0)) - delay = samples > DAC33_BUFFER_SIZE_SAMPLES ? - DAC33_BUFFER_SIZE_SAMPLES : samples; + delay = samples > dac33->fifo_size ? + dac33->fifo_size : samples; else delay = 0; } @@ -1226,7 +1235,7 @@ static snd_pcm_sframes_t dac33_dai_delay( samples_in = US_TO_SAMPLES( dac33->burst_rate, time_delta); - delay = MODE7_LTHR + samples_in - samples_out; + delay = DAC33_MODE7_MARGIN + samples_in - samples_out; if (unlikely(delay > uthr)) delay = uthr; @@ -1477,8 +1486,6 @@ 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->mode1_latency = pdata->mode1_latency; if (!dac33->mode1_latency) |