Since 256xFS clocks cannot be generated by SKL, the NAU8825 is configured to re-generate its system clock from the BCLK using the FLL. The link is configured to use a 48kHz frame rate, and 24 bits in 25-bit slot. The SSP configuration is extracted from NHLT settings and not dynamically changed. Listening tests and measurements do not show any distortion or issues

Signed-off-by: John Hsu KCHSU0@nuvoton.com Signed-off-by: Yong Zhi yong.zhi@intel.com Signed-off-by: Mac Chiang mac.chiang@intel.com Signed-off-by: Ben Zhang benzh@chromium.org Signed-off-by: Radoslaw Biernacki rad@semihalf.com ---

Notes: v1 -> v2: - adding same changes to skl_nau88l25_max98357a.c v2 -> v3: - removing msleep() in SNDRV_PCM_TRIGGER_RESUME as it unnecessarily increase playback/capture latency while actually FLL does not require it. - simplifing commit message v3 -> v4: - simplifing the PM resume callback code for setting the FLL - adding comment for the stream START/RESUME sequence which prevent audio pops - fixing mising var initialization in platform_clock_control() v4 -> v5: - removed stray change ~ SSP0 ops v5 -> v6: - fixing typos and comment style

.../soc/intel/boards/skl_nau88l25_max98357a.c | 62 +++++++++++------- sound/soc/intel/boards/skl_nau88l25_ssm4567.c | 63 ++++++++++++------- 2 files changed, 83 insertions(+), 42 deletions(-)

diff --git a/sound/soc/intel/boards/skl_nau88l25_max98357a.c b/sound/soc/intel/boards/skl_nau88l25_max98357a.c index d7b8154c43a4..12595138f44b 100644 --- a/sound/soc/intel/boards/skl_nau88l25_max98357a.c +++ b/sound/soc/intel/boards/skl_nau88l25_max98357a.c @@ -8,6 +8,7 @@

#include <linux/module.h> #include <linux/platform_device.h> +#include <linux/delay.h> #include <sound/core.h> #include <sound/jack.h> #include <sound/pcm.h> @@ -47,12 +48,12 @@ enum { };

static int platform_clock_control(struct snd_soc_dapm_widget *w, - struct snd_kcontrol *k, int event) + struct snd_kcontrol *k, int event) { struct snd_soc_dapm_context *dapm = w->dapm; struct snd_soc_card *card = dapm->card; struct snd_soc_dai *codec_dai; - int ret; + int ret = 0;

codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI); if (!codec_dai) { @@ -60,14 +61,7 @@ static int platform_clock_control(struct snd_soc_dapm_widget *w, return -EIO; }

- if (SND_SOC_DAPM_EVENT_ON(event)) { - ret = snd_soc_dai_set_sysclk(codec_dai, - NAU8825_CLK_MCLK, 24000000, SND_SOC_CLOCK_IN); - if (ret < 0) { - dev_err(card->dev, "set sysclk err = %d\n", ret); - return -EIO; - } - } else { + if (!SND_SOC_DAPM_EVENT_ON(event)) { ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_INTERNAL, 0, SND_SOC_CLOCK_IN); if (ret < 0) { @@ -292,24 +286,50 @@ static const struct snd_soc_ops skylake_nau8825_fe_ops = { .startup = skl_fe_startup, };

-static int skylake_nau8825_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params) +static int skylake_nau8825_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); - int ret; - - ret = snd_soc_dai_set_sysclk(codec_dai, - NAU8825_CLK_MCLK, 24000000, SND_SOC_CLOCK_IN); - - if (ret < 0) - dev_err(rtd->dev, "snd_soc_dai_set_sysclk err = %d\n", ret); + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + /* Since 256xFS clocks cannot be generated by SKL, the NAU8825 + * is configured to re-generate its system clock from the BCLK + * using the FLL. + * We must switch system clock (FLL to use BCLK) here as it is + * not given earlier by FW (like in hw_param). We let nau8825 to + * use internal VCO clock till now which reduces the audible + * pop's. + */ + case SNDRV_PCM_TRIGGER_RESUME: + /* Once device resumes, the system will only enable power + * sequence for playback without doing hardware parameter, audio + * format, and PLL configure. In the mean time, the jack + * detection sequence has changed PLL parameters and switched to + * internal clock. Thus, the playback signal distorted without + * correct PLL parameters. Therefore we need to configure PLL + * again + */ + ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0, + SND_SOC_CLOCK_IN); + if (ret < 0) { + dev_err(codec_dai->dev, "can't set FS clock %d\n", ret); + break; + } + ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate, + runtime->rate * 256); + if (ret < 0) + dev_err(codec_dai->dev, "can't set FLL: %d\n", ret); + break; + }

return ret; }

-static const struct snd_soc_ops skylake_nau8825_ops = { - .hw_params = skylake_nau8825_hw_params, +static struct snd_soc_ops skylake_nau8825_ops = { + .trigger = skylake_nau8825_trigger, };

static int skylake_dmic_fixup(struct snd_soc_pcm_runtime *rtd, diff --git a/sound/soc/intel/boards/skl_nau88l25_ssm4567.c b/sound/soc/intel/boards/skl_nau88l25_ssm4567.c index 4b317bcf6ea0..38faaf20306e 100644 --- a/sound/soc/intel/boards/skl_nau88l25_ssm4567.c +++ b/sound/soc/intel/boards/skl_nau88l25_ssm4567.c @@ -12,6 +12,7 @@

#include <linux/module.h> #include <linux/platform_device.h> +#include <linux/delay.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/soc.h> @@ -57,12 +58,12 @@ static const struct snd_kcontrol_new skylake_controls[] = { };

static int platform_clock_control(struct snd_soc_dapm_widget *w, - struct snd_kcontrol *k, int event) + struct snd_kcontrol *k, int event) { struct snd_soc_dapm_context *dapm = w->dapm; struct snd_soc_card *card = dapm->card; struct snd_soc_dai *codec_dai; - int ret; + int ret = 0;

codec_dai = snd_soc_card_get_codec_dai(card, SKL_NUVOTON_CODEC_DAI); if (!codec_dai) { @@ -70,14 +71,7 @@ static int platform_clock_control(struct snd_soc_dapm_widget *w, return -EIO; }

- if (SND_SOC_DAPM_EVENT_ON(event)) { - ret = snd_soc_dai_set_sysclk(codec_dai, - NAU8825_CLK_MCLK, 24000000, SND_SOC_CLOCK_IN); - if (ret < 0) { - dev_err(card->dev, "set sysclk err = %d\n", ret); - return -EIO; - } - } else { + if (!SND_SOC_DAPM_EVENT_ON(event)) { ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_INTERNAL, 0, SND_SOC_CLOCK_IN); if (ret < 0) { @@ -85,6 +79,7 @@ static int platform_clock_control(struct snd_soc_dapm_widget *w, return -EIO; } } + return ret; }

@@ -344,24 +339,50 @@ static int skylake_dmic_fixup(struct snd_soc_pcm_runtime *rtd, return 0; }

-static int skylake_nau8825_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params) +static int skylake_nau8825_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_pcm_runtime *runtime = substream->runtime; struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); - int ret; - - ret = snd_soc_dai_set_sysclk(codec_dai, - NAU8825_CLK_MCLK, 24000000, SND_SOC_CLOCK_IN); - - if (ret < 0) - dev_err(rtd->dev, "snd_soc_dai_set_sysclk err = %d\n", ret); + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + /* Since 256xFS clocks cannot be generated by SKL, the NAU8825 + * is configured to re-generate its system clock from the BCLK + * using the FLL. + * We must switch system clock (FLL to use BCLK) here as it is + * not given earlier by FW (like in hw_param). We let nau8825 to + * use internal VCO clock till now which reduces the audible + * pop's. + */ + case SNDRV_PCM_TRIGGER_RESUME: + /* Once device resumes, the system will only enable power + * sequence for playback without doing hardware parameter, audio + * format, and PLL configure. In the mean time, the jack + * detection sequence has changed PLL parameters and switched to + * internal clock. Thus, the playback signal distorted without + * correct PLL parameters. Therefore we need to configure PLL + * again + */ + ret = snd_soc_dai_set_sysclk(codec_dai, NAU8825_CLK_FLL_FS, 0, + SND_SOC_CLOCK_IN); + if (ret < 0) { + dev_err(codec_dai->dev, "can't set FS clock %d\n", ret); + break; + } + ret = snd_soc_dai_set_pll(codec_dai, 0, 0, runtime->rate, + runtime->rate * 256); + if (ret < 0) + dev_err(codec_dai->dev, "can't set FLL: %d\n", ret); + break; + }

return ret; }

-static const struct snd_soc_ops skylake_nau8825_ops = { - .hw_params = skylake_nau8825_hw_params, +static struct snd_soc_ops skylake_nau8825_ops = { + .trigger = skylake_nau8825_trigger, };

static const unsigned int channels_dmic[] = {