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ASoC: mxs-saif: Store saif state 

Trigger commands may be passed multiple times. To avoid errors with
clk_enable/disable, store the saif state and return if saif is already
running/stopped.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Markus Pargmann 2013-10-11 12:11:03 +02:00 committed by Mark Brown
parent 9f1614aae5
commit 88cf632a13
2 changed files with 13 additions and 0 deletions
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8
sound/soc/mxs/mxs-saif.c
View File

@ -503,6 +503,9 @@ static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (saif->state == MXS_SAIF_STATE_RUNNING)
return 0;
dev_dbg(cpu_dai->dev, "start\n");
clk_enable(master_saif->clk);
@ -543,6 +546,7 @@ static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
}
master_saif->ongoing = 1;
saif->state = MXS_SAIF_STATE_RUNNING;
dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n",
__raw_readl(saif->base + SAIF_CTRL),
@ -555,6 +559,9 @@ static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (saif->state == MXS_SAIF_STATE_STOPPED)
return 0;
dev_dbg(cpu_dai->dev, "stop\n");
/* wait a while for the current sample to complete */
@ -575,6 +582,7 @@ static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
}
master_saif->ongoing = 0;
saif->state = MXS_SAIF_STATE_STOPPED;
break;
default:

5
sound/soc/mxs/mxs-saif.h
View File

@ -124,6 +124,11 @@ struct mxs_saif {
u32 fifo_underrun;
u32 fifo_overrun;
enum {
MXS_SAIF_STATE_STOPPED,
MXS_SAIF_STATE_RUNNING,
} state;
};
extern int mxs_saif_put_mclk(unsigned int saif_id);