Commit f9911803 authored by Jyri Sarha's avatar Jyri Sarha Committed by Mark Brown

ASoC: simple-card: Enable and disable DAI clocks as needed

Call clk_prepare_enable() and clk_disable_unprepare() for cpu dai
clock and codec dai clock in dai statup and shutdown callbacks. This
to make sure the related clock are enabled when the audio device is
used.
Signed-off-by: default avatarJyri Sarha <jsarha@ti.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 97bf6af1
......@@ -75,6 +75,11 @@ Optional CPU/CODEC subnodes properties:
it can be specified via "clocks" if system has
clock node (= common clock), or "system-clock-frequency"
(if system doens't support common clock)
If a clock is specified, it is
enabled with clk_prepare_enable()
in dai startup() and disabled with
clk_disable_unprepare() in dai
shutdown().
Example 1 - single DAI link:
......
......@@ -20,6 +20,7 @@ struct asoc_simple_dai {
unsigned int sysclk;
int slots;
int slot_width;
struct clk *clk;
};
struct asoc_simple_card_info {
......
......@@ -39,6 +39,37 @@ struct simple_card_data {
#define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + i)
#define simple_priv_to_props(priv, i) ((priv)->dai_props + i)
static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props =
&priv->dai_props[rtd - rtd->card->rtd];
int ret;
ret = clk_prepare_enable(dai_props->cpu_dai.clk);
if (ret)
return ret;
ret = clk_prepare_enable(dai_props->codec_dai.clk);
if (ret)
clk_disable_unprepare(dai_props->cpu_dai.clk);
return ret;
}
static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
struct simple_dai_props *dai_props =
&priv->dai_props[rtd - rtd->card->rtd];
clk_disable_unprepare(dai_props->cpu_dai.clk);
clk_disable_unprepare(dai_props->codec_dai.clk);
}
static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
......@@ -58,6 +89,8 @@ static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
}
static struct snd_soc_ops asoc_simple_card_ops = {
.startup = asoc_simple_card_startup,
.shutdown = asoc_simple_card_shutdown,
.hw_params = asoc_simple_card_hw_params,
};
......@@ -219,6 +252,7 @@ asoc_simple_card_sub_parse_of(struct device_node *np,
}
dai->sysclk = clk_get_rate(clk);
dai->clk = clk;
} else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
dai->sysclk = val;
} else {
......
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