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authorEero Nurkkala <ext-eero.nurkkala@nokia.com>2009-08-20 16:18:24 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:29 +0100
commitca6e2ce08679c094878d7f39a0349a7db1d13675 (patch)
tree2b2bac37dad9a8c888503deb2bd51e18bba9b02a
parentc721bbdad71d2928e8b5015e9b462fbeb35427c6 (diff)
downloadlinux-linaro-precise-ca6e2ce08679c094878d7f39a0349a7db1d13675.tar.gz
ASoC: Always syncronize audio transfers on frames
All these steps are required for ASoC to behave correctly. rccr and xccr are format dependent, for example TDM audio has different values than I2S or DSP_A. Also the omap_mcbsp_xmit_enable and/or omap_mcbsp_recv_enable must be called right after the DMA has started. This provides no longer L and R channels switching at random. Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com> Acked-by: Jarkko Nikula <jhnikula@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--sound/soc/omap/omap-mcbsp.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index a7b09614734..6e855080e6e 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -191,6 +191,11 @@ static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
mcbsp_data->active++;
omap_mcbsp_start(mcbsp_data->bus_id, play, !play);
+ /* Make sure data transfer is frame synchronized */
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ omap_mcbsp_xmit_enable(mcbsp_data->bus_id, 1);
+ else
+ omap_mcbsp_recv_enable(mcbsp_data->bus_id, 1);
break;
case SNDRV_PCM_TRIGGER_STOP:
@@ -336,11 +341,15 @@ static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
/* 1-bit data delay */
regs->rcr2 |= RDATDLY(1);
regs->xcr2 |= XDATDLY(1);
+ regs->rccr |= RFULL_CYCLE | RDMAEN | RDISABLE;
+ regs->xccr |= (DXENDLY(1) | XDMAEN | XDISABLE);
break;
case SND_SOC_DAIFMT_DSP_A:
/* 1-bit data delay */
regs->rcr2 |= RDATDLY(1);
regs->xcr2 |= XDATDLY(1);
+ regs->rccr |= RFULL_CYCLE | RDMAEN | RDISABLE;
+ regs->xccr |= (DXENDLY(1) | XDMAEN | XDISABLE);
/* Invert FS polarity configuration */
temp_fmt ^= SND_SOC_DAIFMT_NB_IF;
break;