If master clock is provided through device tree, then update the master clock frequency during set_sysclk.
Cc: Tushar Behera tushar.behera@linaro.org Signed-off-by: Andreas Färber afaerber@suse.de --- sound/soc/codecs/max98088.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c index 69a21d1946e3..1aa81321afba 100644 --- a/sound/soc/codecs/max98088.c +++ b/sound/soc/codecs/max98088.c @@ -16,6 +16,7 @@ #include <linux/pm.h> #include <linux/i2c.h> #include <linux/regmap.h> +#include <linux/clk.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> @@ -42,6 +43,7 @@ struct max98088_priv { struct regmap *regmap; enum max98088_type devtype; struct max98088_pdata *pdata; + struct clk *mclk; unsigned int sysclk; struct max98088_cdata dai[2]; int eq_textcnt; @@ -1361,6 +1363,11 @@ static int max98088_dai_set_sysclk(struct snd_soc_dai *dai, if (freq == max98088->sysclk) return 0;
+ if (!IS_ERR(max98088->mclk)) { + freq = clk_round_rate(max98088->mclk, freq); + clk_set_rate(max98088->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 30MHz).. @@ -1568,6 +1575,19 @@ static int max98088_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(max98088->mclk)) { + if (codec->dapm.bias_level == SND_SOC_BIAS_ON) + clk_disable_unprepare(max98088->mclk); + else + clk_prepare_enable(max98088->mclk); + } break;
case SND_SOC_BIAS_STANDBY: @@ -1900,6 +1920,10 @@ static int max98088_probe(struct snd_soc_codec *codec) max98088->sysclk = (unsigned)-1; max98088->eq_textcnt = 0;
+ max98088->mclk = devm_clk_get(codec->dev, "mclk"); + if (PTR_ERR(max98088->mclk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + cdata = &max98088->dai[0]; cdata->rate = (unsigned)-1; cdata->fmt = (unsigned)-1;