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