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authorDaniel Mack <zonque@gmail.com>2012-03-19 09:12:53 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-02 09:27:11 -0700
commitbb4b47099da04aa78ef6b351ef85574f7690780f (patch)
tree10dce64ccc90c6254d21fd447b14a5e9a994cd91 /sound/soc/pxa/pxa-ssp.c
parentb113a5a2f7c1a153a49b388fd8695219207fe669 (diff)
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ASoC: pxa-ssp: atomically set stream active masks
commit 273b72c8ce6b28df6b49423d775c3e59072c73c5 upstream. PXA's SSP engine fails to take its current channel phase into account when enabling a stream while the engine is already running. This results in randomly swapped left/right channels on either the record or the playback side, depending on which one was enabled first. The following patch fixes this by factoring out the bit field modifications in question to a separate function that pauses the engine temporarily, modifies the bits and kicks it off again afterwards. Appearantly, a transition of SSCR0_SSE syncs both directions properly. The patch has been rolled out to quite a number of devices over the last weeks and seems to fix the issue reliably. Signed-off-by: Daniel Mack <zonque@gmail.com> Reported-and-tested-by: Sven Neumann <s.neumann@raumfeld.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/soc/pxa/pxa-ssp.c')
-rw-r--r--sound/soc/pxa/pxa-ssp.c61
1 files changed, 36 insertions, 25 deletions
diff --git a/sound/soc/pxa/pxa-ssp.c b/sound/soc/pxa/pxa-ssp.c
index 8ad93ee..b583e60 100644
--- a/sound/soc/pxa/pxa-ssp.c
+++ b/sound/soc/pxa/pxa-ssp.c
@@ -668,6 +668,38 @@ static int pxa_ssp_hw_params(struct snd_pcm_substream *substream,
return 0;
}
+static void pxa_ssp_set_running_bit(struct snd_pcm_substream *substream,
+ struct ssp_device *ssp, int value)
+{
+ uint32_t sscr0 = pxa_ssp_read_reg(ssp, SSCR0);
+ uint32_t sscr1 = pxa_ssp_read_reg(ssp, SSCR1);
+ uint32_t sspsp = pxa_ssp_read_reg(ssp, SSPSP);
+ uint32_t sssr = pxa_ssp_read_reg(ssp, SSSR);
+
+ if (value && (sscr0 & SSCR0_SSE))
+ pxa_ssp_write_reg(ssp, SSCR0, sscr0 & ~SSCR0_SSE);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (value)
+ sscr1 |= SSCR1_TSRE;
+ else
+ sscr1 &= ~SSCR1_TSRE;
+ } else {
+ if (value)
+ sscr1 |= SSCR1_RSRE;
+ else
+ sscr1 &= ~SSCR1_RSRE;
+ }
+
+ pxa_ssp_write_reg(ssp, SSCR1, sscr1);
+
+ if (value) {
+ pxa_ssp_write_reg(ssp, SSSR, sssr);
+ pxa_ssp_write_reg(ssp, SSPSP, sspsp);
+ pxa_ssp_write_reg(ssp, SSCR0, sscr0 | SSCR0_SSE);
+ }
+}
+
static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *cpu_dai)
{
@@ -681,42 +713,21 @@ static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
pxa_ssp_enable(ssp);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- val = pxa_ssp_read_reg(ssp, SSCR1);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- val |= SSCR1_TSRE;
- else
- val |= SSCR1_RSRE;
- pxa_ssp_write_reg(ssp, SSCR1, val);
+ pxa_ssp_set_running_bit(substream, ssp, 1);
val = pxa_ssp_read_reg(ssp, SSSR);
pxa_ssp_write_reg(ssp, SSSR, val);
break;
case SNDRV_PCM_TRIGGER_START:
- val = pxa_ssp_read_reg(ssp, SSCR1);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- val |= SSCR1_TSRE;
- else
- val |= SSCR1_RSRE;
- pxa_ssp_write_reg(ssp, SSCR1, val);
- pxa_ssp_enable(ssp);
+ pxa_ssp_set_running_bit(substream, ssp, 1);
break;
case SNDRV_PCM_TRIGGER_STOP:
- val = pxa_ssp_read_reg(ssp, SSCR1);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- val &= ~SSCR1_TSRE;
- else
- val &= ~SSCR1_RSRE;
- pxa_ssp_write_reg(ssp, SSCR1, val);
+ pxa_ssp_set_running_bit(substream, ssp, 0);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
pxa_ssp_disable(ssp);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- val = pxa_ssp_read_reg(ssp, SSCR1);
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- val &= ~SSCR1_TSRE;
- else
- val &= ~SSCR1_RSRE;
- pxa_ssp_write_reg(ssp, SSCR1, val);
+ pxa_ssp_set_running_bit(substream, ssp, 0);
break;
default: