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ASoC: mxs-saif: fix clk_prepare() without matching clk_unprepare() 

The clk_prepare() call in hw_params() has no matching clk_unprepare(),
leaving the clk with an ever-increasing prepare count.  Moreover,
hw_params() can be called multiple times which would again leave us
with a runaway prepare count.  Fix this by moving the clk_prepare()
call to the startup() function and adding a shutdown() function with
a matching clk_unprepare() as these operations are already correctly
bracketed by soc-core.

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mans Rullgard 2016-01-21 14:55:56 +00:00 committed by Mark Brown
parent 92e963f50f
commit f212c6d8c2
1 changed files with 11 additions and 2 deletions
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13
sound/soc/mxs/mxs-saif.c
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@ -381,9 +381,19 @@ static int mxs_saif_startup(struct snd_pcm_substream *substream,
__raw_writel(BM_SAIF_CTRL_CLKGATE,
saif->base + SAIF_CTRL + MXS_CLR_ADDR);
clk_prepare(saif->clk);
return 0;
}
static void mxs_saif_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
clk_unprepare(saif->clk);
}
/*
* Should only be called when port is inactive.
* although can be called multiple times by upper layers.
@ -424,8 +434,6 @@ static int mxs_saif_hw_params(struct snd_pcm_substream *substream,
return ret;
}
/* prepare clk in hw_param, enable in trigger */
clk_prepare(saif->clk);
if (saif != master_saif) {
/*
* Set an initial clock rate for the saif internal logic to work
@ -611,6 +619,7 @@ static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
static const struct snd_soc_dai_ops mxs_saif_dai_ops = {
.startup = mxs_saif_startup,
.shutdown = mxs_saif_shutdown,
.trigger = mxs_saif_trigger,
.prepare = mxs_saif_prepare,
.hw_params = mxs_saif_hw_params,