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 <[email protected]>
Signed-off-by: Yong Zhi <[email protected]>
Signed-off-by: Mac Chiang <[email protected]>
Signed-off-by: Ben Zhang <[email protected]>
Signed-off-by: Radoslaw Biernacki <[email protected]>
---
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
.../soc/intel/boards/skl_nau88l25_max98357a.c | 63 ++++++++++++------
sound/soc/intel/boards/skl_nau88l25_ssm4567.c | 64 +++++++++++++------
2 files changed, 85 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..2f0abbd2dd8d 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 +286,51 @@ 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 eariler by FW (like in hw_param). We let nau8825 to
+ * use internal VCO clock till now which reduces the audiable
+ * pop's. */
+
+ /* fall through */
+
+ 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
+ * detecion 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..6791be63c866 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 +339,51 @@ 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 eariler by FW (like in hw_param). We let nau8825 to
+ * use internal VCO clock till now which reduces the audiable
+ * pop's. */
+
+ /* fall through */
+
+ 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
+ * detecion 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[] = {
--
2.17.1