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| author | Tushar Behera <tushar.behera@linaro.org> | 2014-05-26 13:58:21 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-05-26 16:16:54 +0100 |
| commit | b10ab7b838bdd86031aececcb386dc253ef3466f (patch) | |
| tree | 08a43428c8c631d06ae9e18def44f654397d4db1 /sound/soc/codecs/max98090.c | |
| parent | 2c81a10ae6c6aaef68f8b92b4fc8037d1dfe0d9e (diff) | |
| download | linux-b10ab7b838bdd86031aececcb386dc253ef3466f.tar.gz linux-b10ab7b838bdd86031aececcb386dc253ef3466f.tar.bz2 linux-b10ab7b838bdd86031aececcb386dc253ef3466f.zip | |
ASoC: max98090: Add master clock handling
If master clock is provided through device tree, then update
the master clock frequency during set_sysclk.
Documentation has been updated to reflect the change.
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'sound/soc/codecs/max98090.c')
| -rw-r--r-- | sound/soc/codecs/max98090.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/sound/soc/codecs/max98090.c b/sound/soc/codecs/max98090.c index 4ee1f88760c4..8857be798f3b 100644 --- a/sound/soc/codecs/max98090.c +++ b/sound/soc/codecs/max98090.c @@ -16,6 +16,7 @@ #include <linux/regmap.h> #include <linux/slab.h> #include <linux/acpi.h> +#include <linux/clk.h> #include <sound/jack.h> #include <sound/pcm.h> #include <sound/pcm_params.h> @@ -1798,6 +1799,19 @@ static int max98090_set_bias_level(struct snd_soc_codec *codec, break; case SND_SOC_BIAS_PREPARE: + /* + * SND_SOC_BIAS_PREPARE is called while preparing for a + * transition to ON or away from ON. If current bias_level + * is SND_SOC_BIAS_ON, then it is preparing for a transition + * away from ON. Disable the clock in that case, otherwise + * enable it. + */ + if (!IS_ERR(max98090->mclk)) { + if (codec->dapm.bias_level == SND_SOC_BIAS_ON) + clk_disable_unprepare(max98090->mclk); + else + clk_prepare_enable(max98090->mclk); + } break; case SND_SOC_BIAS_STANDBY: @@ -1927,6 +1941,11 @@ static int max98090_dai_set_sysclk(struct snd_soc_dai *dai, if (freq == max98090->sysclk) return 0; + if (!IS_ERR(max98090->mclk)) { + freq = clk_round_rate(max98090->mclk, freq); + clk_set_rate(max98090->mclk, freq); + } + /* Setup clocks for slave mode, and using the PLL * PSCLK = 0x01 (when master clk is 10MHz to 20MHz) * 0x02 (when master clk is 20MHz to 40MHz).. @@ -2211,6 +2230,10 @@ static int max98090_probe(struct snd_soc_codec *codec) dev_dbg(codec->dev, "max98090_probe\n"); + max98090->mclk = devm_clk_get(codec->dev, "mclk"); + if (PTR_ERR(max98090->mclk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + max98090->codec = codec; /* Reset the codec, the DSP core, and disable all interrupts */ |