[6/6] ASoC: Intel: kbl: Enable mclk and ssp sclk early
diff mbox

Message ID 1504794565-19168-7-git-send-email-subhransu.s.prusty@intel.com
State New
Headers show

Commit Message

Subhransu S. Prusty Sept. 7, 2017, 2:29 p.m. UTC
From: Harsha Priya <harshapriya.n@intel.com>

rt5663 needs mclk/sclk early to synchronize its internal clocks. Enable
these clocks early.

Signed-off-by: Harsha Priya <harshapriya.n@intel.com>
Signed-off-by: Jaikrishna Nemallapudi <jaikrishnax.nemallapudi@intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
---
 sound/soc/intel/Kconfig                      |  1 +
 sound/soc/intel/boards/kbl_rt5663_max98927.c | 94 +++++++++++++++++++++++++++-
 2 files changed, 94 insertions(+), 1 deletion(-)

Comments

Pierre-Louis Bossart Sept. 7, 2017, 10:19 p.m. UTC | #1
> +static int platform_clock_control(struct snd_soc_dapm_widget *w,
> +			struct snd_kcontrol *k, int  event)
> +{
> +	struct snd_soc_dapm_context *dapm = w->dapm;
> +	struct snd_soc_card *card = dapm->card;
> +	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
> +
> +	clk_disable_unprepare(priv->mclk);
> +	clk_disable_unprepare(priv->sclk);
> +
> +	return 0;
> +}
> +
>   static const struct snd_soc_dapm_widget kabylake_widgets[] = {
>   	SND_SOC_DAPM_HP("Headphone Jack", NULL),
>   	SND_SOC_DAPM_MIC("Headset Mic", NULL),
> @@ -77,7 +95,8 @@ enum {
>   	SND_SOC_DAPM_SPK("HDMI1", NULL),
>   	SND_SOC_DAPM_SPK("HDMI2", NULL),
>   	SND_SOC_DAPM_SPK("HDMI3", NULL),
> -
> +	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0,
> +			platform_clock_control, SND_SOC_DAPM_POST_PMD),
[snip]
> +static int kabylake_enable_ssp_clks(struct snd_soc_card *card)
> +{
> +
> +	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
> +	int ret;
> +
> +	/* Enable MCLK */
> +	ret = clk_set_rate(priv->mclk, 24000000);
> +	if (ret < 0) {
> +		dev_err(card->dev, "Can't set rate for mclk, err: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(priv->mclk);
> +	if (ret < 0) {
> +		dev_err(card->dev, "Can't enable mclk, err: %d\n", ret);
> +		return ret;
> +	}
> +
> +	/* Enable SCLK */
> +	ret = clk_set_rate(priv->sclk, 3072000);
> +	if (ret < 0) {
> +		dev_err(card->dev, "Can't set rate for sclk, err: %d\n", ret);
> +		clk_disable_unprepare(priv->mclk);
> +		return ret;
> +	}
> +
> +	ret = clk_prepare_enable(priv->sclk);
> +	if (ret < 0) {
> +		dev_err(card->dev, "Can't enable sclk, err: %d\n", ret);
> +		clk_disable_unprepare(priv->mclk);
> +	}
> +
> +	return ret;
> +}
> +
>   static int kabylake_rt5663_hw_params(struct snd_pcm_substream *substream,
>   	struct snd_pcm_hw_params *params)
>   {
>   	struct snd_soc_pcm_runtime *rtd = substream->private_data;
>   	struct snd_soc_dai *codec_dai = rtd->codec_dai;
> +	struct snd_soc_card *card = rtd->card;
>   	int ret;
>   
> +	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
> +		ret = kabylake_enable_ssp_clks(card);

Is there a reason why the clocks need to be enabled in the hw_params() 
instead of platform_clock_control()?
The code is not symmetrical between enable/disable, is this intended? I 
remember seeing this in a different context (dialog codec?).
Subhransu S. Prusty Sept. 8, 2017, 3:26 a.m. UTC | #2
On Thu, Sep 07, 2017 at 05:19:25PM -0500, Pierre-Louis Bossart wrote:
> 
> >+static int platform_clock_control(struct snd_soc_dapm_widget *w,
> >+			struct snd_kcontrol *k, int  event)
> >+{
> >+	struct snd_soc_dapm_context *dapm = w->dapm;
> >+	struct snd_soc_card *card = dapm->card;
> >+	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
> >+
> >+	clk_disable_unprepare(priv->mclk);
> >+	clk_disable_unprepare(priv->sclk);
> >+
> >+	return 0;
> >+}
> >+
> >  static const struct snd_soc_dapm_widget kabylake_widgets[] = {
> >  	SND_SOC_DAPM_HP("Headphone Jack", NULL),
> >  	SND_SOC_DAPM_MIC("Headset Mic", NULL),
> >@@ -77,7 +95,8 @@ enum {
> >  	SND_SOC_DAPM_SPK("HDMI1", NULL),
> >  	SND_SOC_DAPM_SPK("HDMI2", NULL),
> >  	SND_SOC_DAPM_SPK("HDMI3", NULL),
> >-
> >+	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0,
> >+			platform_clock_control, SND_SOC_DAPM_POST_PMD),
> [snip]
> >+static int kabylake_enable_ssp_clks(struct snd_soc_card *card)
> >+{
> >+
> >+	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
> >+	int ret;
> >+
> >+	/* Enable MCLK */
> >+	ret = clk_set_rate(priv->mclk, 24000000);
> >+	if (ret < 0) {
> >+		dev_err(card->dev, "Can't set rate for mclk, err: %d\n", ret);
> >+		return ret;
> >+	}
> >+
> >+	ret = clk_prepare_enable(priv->mclk);
> >+	if (ret < 0) {
> >+		dev_err(card->dev, "Can't enable mclk, err: %d\n", ret);
> >+		return ret;
> >+	}
> >+
> >+	/* Enable SCLK */
> >+	ret = clk_set_rate(priv->sclk, 3072000);
> >+	if (ret < 0) {
> >+		dev_err(card->dev, "Can't set rate for sclk, err: %d\n", ret);
> >+		clk_disable_unprepare(priv->mclk);
> >+		return ret;
> >+	}
> >+
> >+	ret = clk_prepare_enable(priv->sclk);
> >+	if (ret < 0) {
> >+		dev_err(card->dev, "Can't enable sclk, err: %d\n", ret);
> >+		clk_disable_unprepare(priv->mclk);
> >+	}
> >+
> >+	return ret;
> >+}
> >+
> >  static int kabylake_rt5663_hw_params(struct snd_pcm_substream *substream,
> >  	struct snd_pcm_hw_params *params)
> >  {
> >  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
> >  	struct snd_soc_dai *codec_dai = rtd->codec_dai;
> >+	struct snd_soc_card *card = rtd->card;
> >  	int ret;
> >+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
> >+		ret = kabylake_enable_ssp_clks(card);
> 
> Is there a reason why the clocks need to be enabled in the
> hw_params() instead of platform_clock_control()?

Hi Pierre,

Thanks for the review.

For rt5663 the internal codec clock is configured in set_sysclk callback.
And It is understood from realtek that the mclk/bclk need to turned ON
before the set_sysclk call for a successful clock synchronization by the
codec. So the clocks are enabled in hw_params and disabled in
platform_clk_control.

I will add comments explaining this in the v2 once I receive feedback for
rest of the series.

Regards,
Subhransu

> The code is not symmetrical between enable/disable, is this
> intended? I remember seeing this in a different context (dialog
> codec?).

Patch
diff mbox

diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index b9d9d692b4e3..6f05119e9df2 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -247,6 +247,7 @@  config SND_SOC_INTEL_KBL_RT5663_MAX98927_MACH
 	select SND_SOC_MAX98927
 	select SND_SOC_DMIC
 	select SND_SOC_HDAC_HDMI
+	select SND_SOC_INTEL_SKYLAKE_SSP_CLK
 	help
 	  This adds support for ASoC Onboard Codec I2S machine driver. This will
 	  create an alsa sound card for RT5663 + MAX98927.
diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
index 7f7607420706..b20804c850a7 100644
--- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
@@ -27,6 +27,9 @@ 
 #include "../../codecs/rt5663.h"
 #include "../../codecs/hdac_hdmi.h"
 #include "../skylake/skl.h"
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
 
 #define KBL_REALTEK_CODEC_DAI "rt5663-aif"
 #define KBL_MAXIM_CODEC_DAI "max98927-aif1"
@@ -47,6 +50,8 @@  struct kbl_hdmi_pcm {
 struct kbl_rt5663_private {
 	struct snd_soc_jack kabylake_headset;
 	struct list_head hdmi_pcm_list;
+	struct clk *mclk;
+	struct clk *sclk;
 };
 
 enum {
@@ -68,6 +73,19 @@  enum {
 	SOC_DAPM_PIN_SWITCH("Right Spk"),
 };
 
+static int platform_clock_control(struct snd_soc_dapm_widget *w,
+			struct snd_kcontrol *k, int  event)
+{
+	struct snd_soc_dapm_context *dapm = w->dapm;
+	struct snd_soc_card *card = dapm->card;
+	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
+
+	clk_disable_unprepare(priv->mclk);
+	clk_disable_unprepare(priv->sclk);
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget kabylake_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
@@ -77,7 +95,8 @@  enum {
 	SND_SOC_DAPM_SPK("HDMI1", NULL),
 	SND_SOC_DAPM_SPK("HDMI2", NULL),
 	SND_SOC_DAPM_SPK("HDMI3", NULL),
-
+	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0,
+			platform_clock_control, SND_SOC_DAPM_POST_PMD),
 };
 
 static const struct snd_soc_dapm_route kabylake_map[] = {
@@ -90,6 +109,7 @@  enum {
 	{ "Right Spk", NULL, "Right BE_OUT" },
 
 	/* other jacks */
+	{ "Headset Mic", NULL, "Platform Clock" },
 	{ "IN1P", NULL, "Headset Mic" },
 	{ "IN1N", NULL, "Headset Mic" },
 	{ "DMic", NULL, "SoC DMIC" },
@@ -352,13 +372,56 @@  static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 	return 0;
 }
 
+static int kabylake_enable_ssp_clks(struct snd_soc_card *card)
+{
+
+	struct kbl_rt5663_private *priv = snd_soc_card_get_drvdata(card);
+	int ret;
+
+	/* Enable MCLK */
+	ret = clk_set_rate(priv->mclk, 24000000);
+	if (ret < 0) {
+		dev_err(card->dev, "Can't set rate for mclk, err: %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(priv->mclk);
+	if (ret < 0) {
+		dev_err(card->dev, "Can't enable mclk, err: %d\n", ret);
+		return ret;
+	}
+
+	/* Enable SCLK */
+	ret = clk_set_rate(priv->sclk, 3072000);
+	if (ret < 0) {
+		dev_err(card->dev, "Can't set rate for sclk, err: %d\n", ret);
+		clk_disable_unprepare(priv->mclk);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(priv->sclk);
+	if (ret < 0) {
+		dev_err(card->dev, "Can't enable sclk, err: %d\n", ret);
+		clk_disable_unprepare(priv->mclk);
+	}
+
+	return ret;
+}
+
 static int kabylake_rt5663_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_card *card = rtd->card;
 	int ret;
 
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		ret = kabylake_enable_ssp_clks(card);
+		if (ret < 0)
+			return ret;
+	}
+
 	/* use ASRC for internal clocks, as PLL rate isn't multiple of BCLK */
 	rt5663_sel_asrc_clk_src(codec_dai->codec,
 			RT5663_DA_STEREO_FILTER | RT5663_AD_STEREO_FILTER,
@@ -839,6 +902,7 @@  static int kabylake_audio_probe(struct platform_device *pdev)
 {
 	struct kbl_rt5663_private *ctx;
 	struct skl_machine_pdata *pdata;
+	int ret;
 
 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_ATOMIC);
 	if (!ctx)
@@ -857,6 +921,34 @@  static int kabylake_audio_probe(struct platform_device *pdev)
 		dmic_constraints = pdata->dmic_num == 2 ?
 			&constraints_dmic_2ch : &constraints_dmic_channels;
 
+	ctx->mclk = devm_clk_get(&pdev->dev, "ssp1_mclk");
+	if (IS_ERR(ctx->mclk)) {
+		ret = PTR_ERR(ctx->mclk);
+		if (ret == -ENOENT) {
+			dev_info(&pdev->dev,
+				"Failed to get ssp1_sclk, defer probe\n");
+			return -EPROBE_DEFER;
+		}
+
+		dev_err(&pdev->dev, "Failed to get ssp1_mclk with err:%d\n",
+								ret);
+		return ret;
+	}
+
+	ctx->sclk = devm_clk_get(&pdev->dev, "ssp1_sclk");
+	if (IS_ERR(ctx->sclk)) {
+		ret = PTR_ERR(ctx->sclk);
+		if (ret == -ENOENT) {
+			dev_info(&pdev->dev,
+				"Failed to get ssp1_sclk, defer probe\n");
+			return -EPROBE_DEFER;
+		}
+
+		dev_err(&pdev->dev, "Failed to get ssp1_sclk with err:%d\n",
+								ret);
+		return ret;
+	}
+
 	return devm_snd_soc_register_card(&pdev->dev, kabylake_audio_card);
 }