summaryrefslogtreecommitdiffstats
path: root/sound/soc/codecs/tlv320dac33.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/soc/codecs/tlv320dac33.c')
-rw-r--r--sound/soc/codecs/tlv320dac33.c222
1 files changed, 217 insertions, 5 deletions
diff --git a/sound/soc/codecs/tlv320dac33.c b/sound/soc/codecs/tlv320dac33.c
index a8eb19b9b6c..3eddaec728c 100644
--- a/sound/soc/codecs/tlv320dac33.c
+++ b/sound/soc/codecs/tlv320dac33.c
@@ -55,6 +55,13 @@
#define BURST_BASEFREQ_HZ 49152000
+#define SAMPLES_TO_US(rate, samples) \
+ (1000000000 / ((rate * 1000) / samples))
+
+#define US_TO_SAMPLES(rate, us) \
+ (rate / (1000000 / us))
+
+
static struct snd_soc_codec *tlv320dac33_codec;
enum dac33_state {
@@ -101,6 +108,14 @@ struct tlv320dac33_priv {
int keep_bclk; /* Keep the BCLK continuously running
* in FIFO modes */
+ spinlock_t lock;
+ unsigned long long t_stamp1; /* Time stamp for FIFO modes to */
+ unsigned long long t_stamp2; /* calculate the FIFO caused delay */
+
+ unsigned int mode1_us_burst; /* Time to burst read n number of
+ * samples */
+ unsigned int mode7_us_to_lthr; /* Time to reach lthr from uthr */
+
enum dac33_state state;
};
@@ -390,10 +405,14 @@ static int dac33_set_nsample(struct snd_kcontrol *kcontrol,
return 0;
if (ucontrol->value.integer.value[0] < dac33->nsample_min ||
- ucontrol->value.integer.value[0] > dac33->nsample_max)
+ ucontrol->value.integer.value[0] > dac33->nsample_max) {
ret = -EINVAL;
- else
+ } else {
dac33->nsample = ucontrol->value.integer.value[0];
+ /* Re calculate the burst time */
+ dac33->mode1_us_burst = SAMPLES_TO_US(dac33->burst_rate,
+ dac33->nsample);
+ }
return ret;
}
@@ -564,6 +583,13 @@ static inline void dac33_prefill_handler(struct tlv320dac33_priv *dac33)
case DAC33_FIFO_MODE1:
dac33_write16(codec, DAC33_NSAMPLE_MSB,
DAC33_THRREG(dac33->nsample + dac33->alarm_threshold));
+
+ /* Take the timestamps */
+ spin_lock_irq(&dac33->lock);
+ dac33->t_stamp2 = ktime_to_us(ktime_get());
+ dac33->t_stamp1 = dac33->t_stamp2;
+ spin_unlock_irq(&dac33->lock);
+
dac33_write16(codec, DAC33_PREFILL_MSB,
DAC33_THRREG(dac33->alarm_threshold));
/* Enable Alarm Threshold IRQ with a delay */
@@ -572,8 +598,18 @@ static inline void dac33_prefill_handler(struct tlv320dac33_priv *dac33)
dac33_write(codec, DAC33_FIFO_IRQ_MASK, DAC33_MAT);
break;
case DAC33_FIFO_MODE7:
+ /* Take the timestamp */
+ spin_lock_irq(&dac33->lock);
+ dac33->t_stamp1 = ktime_to_us(ktime_get());
+ /* Move back the timestamp with drain time */
+ dac33->t_stamp1 -= dac33->mode7_us_to_lthr;
+ spin_unlock_irq(&dac33->lock);
+
dac33_write16(codec, DAC33_PREFILL_MSB,
DAC33_THRREG(MODE7_LTHR));
+
+ /* Enable Upper Threshold IRQ */
+ dac33_write(codec, DAC33_FIFO_IRQ_MASK, DAC33_MUT);
break;
default:
dev_warn(codec->dev, "Unhandled FIFO mode: %d\n",
@@ -590,6 +626,11 @@ static inline void dac33_playback_handler(struct tlv320dac33_priv *dac33)
switch (dac33->fifo_mode) {
case DAC33_FIFO_MODE1:
+ /* Take the timestamp */
+ spin_lock_irq(&dac33->lock);
+ dac33->t_stamp2 = ktime_to_us(ktime_get());
+ spin_unlock_irq(&dac33->lock);
+
dac33_write16(codec, DAC33_NSAMPLE_MSB,
DAC33_THRREG(dac33->nsample));
break;
@@ -642,7 +683,13 @@ static irqreturn_t dac33_interrupt_handler(int irq, void *dev)
struct snd_soc_codec *codec = dev;
struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec);
- queue_work(dac33->dac33_wq, &dac33->work);
+ spin_lock(&dac33->lock);
+ dac33->t_stamp1 = ktime_to_us(ktime_get());
+ spin_unlock(&dac33->lock);
+
+ /* Do not schedule the workqueue in Mode7 */
+ if (dac33->fifo_mode != DAC33_FIFO_MODE7)
+ queue_work(dac33->dac33_wq, &dac33->work);
return IRQ_HANDLED;
}
@@ -794,8 +841,8 @@ static int dac33_prepare_chip(struct snd_pcm_substream *substream)
DAC33_ATM(DAC33_FIFO_IRQ_MODE_LEVEL));
break;
case DAC33_FIFO_MODE7:
- /* Disable all interrupts */
- dac33_write(codec, DAC33_FIFO_IRQ_MASK, 0);
+ dac33_write(codec, DAC33_FIFO_IRQ_MODE_A,
+ DAC33_UTM(DAC33_FIFO_IRQ_MODE_LEVEL));
break;
default:
/* in FIFO bypass mode, the interrupts are not used */
@@ -930,6 +977,24 @@ static void dac33_calculate_times(struct snd_pcm_substream *substream)
if (dac33->nsample > dac33->nsample_max)
dac33->nsample = dac33->nsample_max;
+
+ switch (dac33->fifo_mode) {
+ case DAC33_FIFO_MODE1:
+ dac33->mode1_us_burst = SAMPLES_TO_US(dac33->burst_rate,
+ dac33->nsample);
+ dac33->t_stamp1 = 0;
+ dac33->t_stamp2 = 0;
+ break;
+ case DAC33_FIFO_MODE7:
+ dac33->mode7_us_to_lthr =
+ SAMPLES_TO_US(substream->runtime->rate,
+ MODE7_UTHR - MODE7_LTHR + 1);
+ dac33->t_stamp1 = 0;
+ break;
+ default:
+ break;
+ }
+
}
static int dac33_pcm_prepare(struct snd_pcm_substream *substream,
@@ -974,6 +1039,151 @@ static int dac33_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
return ret;
}
+static snd_pcm_sframes_t dac33_dai_delay(
+ struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_device *socdev = rtd->socdev;
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec);
+ unsigned long long t0, t1, t_now;
+ unsigned int time_delta;
+ int samples_out, samples_in, samples;
+ snd_pcm_sframes_t delay = 0;
+
+ switch (dac33->fifo_mode) {
+ case DAC33_FIFO_BYPASS:
+ break;
+ case DAC33_FIFO_MODE1:
+ spin_lock(&dac33->lock);
+ t0 = dac33->t_stamp1;
+ t1 = dac33->t_stamp2;
+ spin_unlock(&dac33->lock);
+ t_now = ktime_to_us(ktime_get());
+
+ /* We have not started to fill the FIFO yet, delay is 0 */
+ if (!t1)
+ goto out;
+
+ if (t0 > t1) {
+ /*
+ * Phase 1:
+ * After Alarm threshold, and before nSample write
+ */
+ time_delta = t_now - t0;
+ samples_out = time_delta ? US_TO_SAMPLES(
+ substream->runtime->rate,
+ time_delta) : 0;
+
+ if (likely(dac33->alarm_threshold > samples_out))
+ delay = dac33->alarm_threshold - samples_out;
+ else
+ delay = 0;
+ } else if ((t_now - t1) <= dac33->mode1_us_burst) {
+ /*
+ * Phase 2:
+ * After nSample write (during burst operation)
+ */
+ time_delta = t_now - t0;
+ samples_out = time_delta ? US_TO_SAMPLES(
+ substream->runtime->rate,
+ time_delta) : 0;
+
+ time_delta = t_now - t1;
+ samples_in = time_delta ? US_TO_SAMPLES(
+ dac33->burst_rate,
+ time_delta) : 0;
+
+ samples = dac33->alarm_threshold;
+ samples += (samples_in - samples_out);
+
+ if (likely(samples > 0))
+ delay = samples;
+ else
+ delay = 0;
+ } else {
+ /*
+ * Phase 3:
+ * After burst operation, before next alarm threshold
+ */
+ time_delta = t_now - t0;
+ samples_out = time_delta ? US_TO_SAMPLES(
+ substream->runtime->rate,
+ time_delta) : 0;
+
+ samples_in = dac33->nsample;
+ samples = dac33->alarm_threshold;
+ samples += (samples_in - samples_out);
+
+ if (likely(samples > 0))
+ delay = samples > DAC33_BUFFER_SIZE_SAMPLES ?
+ DAC33_BUFFER_SIZE_SAMPLES : samples;
+ else
+ delay = 0;
+ }
+ break;
+ case DAC33_FIFO_MODE7:
+ spin_lock(&dac33->lock);
+ t0 = dac33->t_stamp1;
+ spin_unlock(&dac33->lock);
+ t_now = ktime_to_us(ktime_get());
+
+ /* We have not started to fill the FIFO yet, delay is 0 */
+ if (!t0)
+ goto out;
+
+ if (t_now <= t0) {
+ /*
+ * Either the timestamps are messed or equal. Report
+ * maximum delay
+ */
+ delay = MODE7_UTHR;
+ goto out;
+ }
+
+ time_delta = t_now - t0;
+ if (time_delta <= dac33->mode7_us_to_lthr) {
+ /*
+ * Phase 1:
+ * After burst (draining phase)
+ */
+ samples_out = US_TO_SAMPLES(
+ substream->runtime->rate,
+ time_delta);
+
+ if (likely(MODE7_UTHR > samples_out))
+ delay = MODE7_UTHR - samples_out;
+ else
+ delay = 0;
+ } else {
+ /*
+ * Phase 2:
+ * During burst operation
+ */
+ time_delta = time_delta - dac33->mode7_us_to_lthr;
+
+ samples_out = US_TO_SAMPLES(
+ substream->runtime->rate,
+ time_delta);
+ samples_in = US_TO_SAMPLES(
+ dac33->burst_rate,
+ time_delta);
+ delay = MODE7_LTHR + samples_in - samples_out;
+
+ if (unlikely(delay > MODE7_UTHR))
+ delay = MODE7_UTHR;
+ }
+ break;
+ default:
+ dev_warn(codec->dev, "Unhandled FIFO mode: %d\n",
+ dac33->fifo_mode);
+ break;
+ }
+out:
+ return delay;
+}
+
static int dac33_set_dai_sysclk(struct snd_soc_dai *codec_dai,
int clk_id, unsigned int freq, int dir)
{
@@ -1185,6 +1395,7 @@ static struct snd_soc_dai_ops dac33_dai_ops = {
.hw_params = dac33_hw_params,
.prepare = dac33_pcm_prepare,
.trigger = dac33_pcm_trigger,
+ .delay = dac33_dai_delay,
.set_sysclk = dac33_set_dai_sysclk,
.set_fmt = dac33_set_dai_fmt,
};
@@ -1225,6 +1436,7 @@ static int __devinit dac33_i2c_probe(struct i2c_client *client,
mutex_init(&codec->mutex);
mutex_init(&dac33->mutex);
+ spin_lock_init(&dac33->lock);
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-24 21:32:50 +0000