1 files changed, 64 insertions, 26 deletions

diff --git a/sound/soc/codecs/tlv320dac33.c b/sound/soc/codecs/tlv320dac33.c
index ced6fbbc9d91..8651b01ed223 100644
--- a/sound/soc/codecs/tlv320dac33.c
+++ b/sound/soc/codecs/tlv320dac33.c
@@ -60,6 +60,9 @@
 #define US_TO_SAMPLES(rate, us) \
         (rate / (1000000 / us))
 
+#define UTHR_FROM_PERIOD_SIZE(samples, playrate, burstrate) \
+        ((samples * 5000) / ((burstrate * 5000) / (burstrate - playrate)))
+
 static void dac33_calculate_times(struct snd_pcm_substream *substream);
 static int dac33_prepare_chip(struct snd_pcm_substream *substream);
 
@@ -107,6 +110,8 @@ struct tlv320dac33_priv {
         unsigned int nsample;           /* burst read amount from host */
         int mode1_latency;              /* latency caused by the i2c writes in
                                          * us */
+        int auto_fifo_config;           /* Configure the FIFO based on the
+                                         * period size */
         u8 burst_bclkdiv;               /* BCLK divider value in burst mode */
         unsigned int burst_rate;        /* Interface speed in Burst modes */
 
@@ -538,13 +543,16 @@ static const struct snd_kcontrol_new dac33_snd_controls[] = {
                  DAC33_LINEL_TO_LLO_VOL, DAC33_LINER_TO_RLO_VOL, 0, 127, 1),
 };
 
-static const struct snd_kcontrol_new dac33_nsample_snd_controls[] = {
+static const struct snd_kcontrol_new dac33_mode_snd_controls[] = {
+        SOC_ENUM_EXT("FIFO Mode", dac33_fifo_mode_enum,
+                 dac33_get_fifo_mode, dac33_set_fifo_mode),
+};
+
+static const struct snd_kcontrol_new dac33_fifo_snd_controls[] = {
         SOC_SINGLE_EXT("nSample", 0, 0, 5900, 0,
-                 dac33_get_nsample, dac33_set_nsample),
+                dac33_get_nsample, dac33_set_nsample),
         SOC_SINGLE_EXT("UTHR", 0, 0, MODE7_UTHR, 0,
                  dac33_get_uthr, dac33_set_uthr),
-        SOC_ENUM_EXT("FIFO Mode", dac33_fifo_mode_enum,
-                 dac33_get_fifo_mode, dac33_set_fifo_mode),
 };
 
 /* Analog bypass */
@@ -1057,24 +1065,38 @@ 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 time shall not be shorter than i2c latency */
-                dac33->nsample_min = dac33->alarm_threshold;
-                /*
-                 * nSample should not be bigger than alsa buffer minus
-                 * size of one period to avoid overruns
-                 */
-                dac33->nsample_max = substream->runtime->buffer_size -
-                                        period_size;
-                nsample_limit = DAC33_BUFFER_SIZE_SAMPLES -
-                                dac33->alarm_threshold;
-                if (dac33->nsample_max > nsample_limit)
-                        dac33->nsample_max = nsample_limit;
-
-                /* Correct the nSample if it is outside of the ranges */
-                if (dac33->nsample < dac33->nsample_min)
-                        dac33->nsample = dac33->nsample_min;
-                if (dac33->nsample > dac33->nsample_max)
-                        dac33->nsample = dac33->nsample_max;
+                if (dac33->auto_fifo_config) {
+                        if (period_size <= dac33->alarm_threshold)
+                                /*
+                                 * Configure nSamaple to number of periods,
+                                 * which covers the latency requironment.
+                                 */
+                                dac33->nsample = period_size *
+                                       ((dac33->alarm_threshold / period_size) +
+                                       (dac33->alarm_threshold % period_size ?
+                                       1 : 0));
+                        else
+                                dac33->nsample = period_size;
+                } else {
+                        /* nSample time shall not be shorter than i2c latency */
+                        dac33->nsample_min = dac33->alarm_threshold;
+                        /*
+                         * nSample should not be bigger than alsa buffer minus
+                         * size of one period to avoid overruns
+                         */
+                        dac33->nsample_max = substream->runtime->buffer_size -
+                                                period_size;
+                        nsample_limit = DAC33_BUFFER_SIZE_SAMPLES -
+                                        dac33->alarm_threshold;
+                        if (dac33->nsample_max > nsample_limit)
+                                dac33->nsample_max = nsample_limit;
+
+                        /* Correct the nSample if it is outside of the ranges */
+                        if (dac33->nsample < dac33->nsample_min)
+                                dac33->nsample = dac33->nsample_min;
+                        if (dac33->nsample > dac33->nsample_max)
+                                dac33->nsample = dac33->nsample_max;
+                }
 
                 dac33->mode1_us_burst = SAMPLES_TO_US(dac33->burst_rate,
                                                       dac33->nsample);
@@ -1082,6 +1104,16 @@ static void dac33_calculate_times(struct snd_pcm_substream *substream)
                 dac33->t_stamp2 = 0;
                 break;
         case DAC33_FIFO_MODE7:
+                if (dac33->auto_fifo_config) {
+                        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);
+                }
                 dac33->mode7_us_to_lthr =
                                 SAMPLES_TO_US(substream->runtime->rate,
                                         dac33->uthr - MODE7_LTHR + 1);
@@ -1379,10 +1411,15 @@ static int dac33_soc_probe(struct platform_device *pdev)
 
         snd_soc_add_controls(codec, dac33_snd_controls,
                              ARRAY_SIZE(dac33_snd_controls));
-        /* Only add the nSample controls, if we have valid IRQ number */
-        if (dac33->irq >= 0)
-                snd_soc_add_controls(codec, dac33_nsample_snd_controls,
-                                     ARRAY_SIZE(dac33_nsample_snd_controls));
+        /* Only add the FIFO controls, if we have valid IRQ number */
+        if (dac33->irq >= 0) {
+                snd_soc_add_controls(codec, dac33_mode_snd_controls,
+                                     ARRAY_SIZE(dac33_mode_snd_controls));
+                /* FIFO usage controls only, if autoio config is not selected */
+                if (!dac33->auto_fifo_config)
+                        snd_soc_add_controls(codec, dac33_fifo_snd_controls,
+                                        ARRAY_SIZE(dac33_fifo_snd_controls));
+        }
 
         dac33_add_widgets(codec);
 
@@ -1513,6 +1550,7 @@ static int __devinit dac33_i2c_probe(struct i2c_client *client,
         /* Pre calculate the burst rate */
         dac33->burst_rate = BURST_BASEFREQ_HZ / dac33->burst_bclkdiv / 32;
         dac33->keep_bclk = pdata->keep_bclk;
+        dac33->auto_fifo_config = pdata->auto_fifo_config;
         dac33->mode1_latency = pdata->mode1_latency;
         if (!dac33->mode1_latency)
                 dac33->mode1_latency = 10000; /* 10ms */