[alsa-devel] [PATCH] ASoC: Intel: eve: Enable mclk and ssp sclk early

[Brent Lu]

From: Naveen M <naveen.m at intel.com>

rt5663 and rt5514 needs mclk/sclk early to synchronize its internal
clocks.

Signed-off-by: Naveen M <naveen.m at intel.com>
Signed-off-by: Harsha Priya <harshapriya.n at intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty at intel.com>
Signed-off-by: Brent Lu <brent.lu at intel.com>
---
 sound/soc/intel/boards/Kconfig                     |   1 +
 .../soc/intel/boards/kbl_rt5663_rt5514_max98927.c  | 100 +++++++++++++++++++++
 2 files changed, 101 insertions(+)

diff --git a/sound/soc/intel/boards/Kconfig b/sound/soc/intel/boards/Kconfig
index 5c27f7a..d5f167e 100644
--- a/sound/soc/intel/boards/Kconfig
+++ b/sound/soc/intel/boards/Kconfig
@@ -315,6 +315,7 @@ config SND_SOC_INTEL_KBL_RT5663_RT5514_MAX98927_MACH
 	depends on I2C && ACPI
 	depends on MFD_INTEL_LPSS || COMPILE_TEST
         depends on SPI
+	select SND_SOC_INTEL_SKYLAKE_SSP_CLK
         select SND_SOC_RT5663
         select SND_SOC_RT5514
         select SND_SOC_RT5514_SPI
diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index 74dda87..7b6e70b 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -22,6 +22,9 @@
 #include "../../codecs/rt5514.h"
 #include "../../codecs/rt5663.h"
 #include "../../codecs/hdac_hdmi.h"
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
 
 #define KBL_REALTEK_CODEC_DAI "rt5663-aif"
 #define KBL_REALTEK_DMIC_CODEC_DAI "rt5514-aif1"
@@ -50,6 +53,8 @@ struct kbl_codec_private {
 	struct snd_soc_jack kabylake_headset;
 	struct list_head hdmi_pcm_list;
 	struct snd_soc_jack kabylake_hdmi[2];
+	struct clk *mclk;
+	struct clk *sclk;
 };
 
 enum {
@@ -71,6 +76,67 @@ static const struct snd_kcontrol_new kabylake_controls[] = {
 	SOC_DAPM_PIN_SWITCH("DMIC"),
 };
 
+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_codec_private *priv = snd_soc_card_get_drvdata(card);
+	int ret = 0;
+
+	/*
+	 * MCLK/SCLK need to be ON early for a successful synchronization of
+	 * codec internal clock. And the clocks are turned off during
+	 * POST_PMD after the stream is stopped.
+	 */
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		if (__clk_is_enabled(priv->mclk))
+			return 0;
+
+		/* 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);
+		}
+		break;
+	case SND_SOC_DAPM_POST_PMD:
+		if (!__clk_is_enabled(priv->mclk))
+			return 0;
+
+		clk_disable_unprepare(priv->mclk);
+		clk_disable_unprepare(priv->sclk);
+		break;
+	default:
+		return 0;
+	}
+
+	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),
@@ -79,11 +145,15 @@ static const struct snd_soc_dapm_widget kabylake_widgets[] = {
 	SND_SOC_DAPM_MIC("DMIC", NULL),
 	SND_SOC_DAPM_SPK("HDMI1", NULL),
 	SND_SOC_DAPM_SPK("HDMI2", NULL),
+	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0,
+			platform_clock_control, SND_SOC_DAPM_PRE_PMU |
+			SND_SOC_DAPM_POST_PMD),
 
 };
 
 static const struct snd_soc_dapm_route kabylake_map[] = {
 	/* Headphones */
+	{ "Headphone Jack", NULL, "Platform Clock" },
 	{ "Headphone Jack", NULL, "HPOL" },
 	{ "Headphone Jack", NULL, "HPOR" },
 
@@ -92,6 +162,7 @@ static const struct snd_soc_dapm_route kabylake_map[] = {
 	{ "Right Spk", NULL, "Right BE_OUT" },
 
 	/* other jacks */
+	{ "Headset Mic", NULL, "Platform Clock" },
 	{ "IN1P", NULL, "Headset Mic" },
 	{ "IN1N", NULL, "Headset Mic" },
 
@@ -643,6 +714,7 @@ static int kabylake_audio_probe(struct platform_device *pdev)
 {
 	struct kbl_codec_private *ctx;
 	struct snd_soc_acpi_mach *mach;
+	int ret = 0;
 
 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
@@ -658,6 +730,34 @@ static int kabylake_audio_probe(struct platform_device *pdev)
 		dmic_constraints = mach->mach_params.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_mclk, 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);
 }
 
-- 
2.7.4