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From:   Lucas Tanure <tanureal@opensource.cirrus.com>
To:     James Schulman <james.schulman@cirrus.com>,
        David Rhodes <david.rhodes@cirrus.com>,
        Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>
CC:     Richard Fitzgerald <rf@opensource.cirrus.com>,
        <alsa-devel@alsa-project.org>, <patches@opensource.cirrus.com>,
        Lucas Tanure <tanureal@opensource.cirrus.com>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH 07/15] ASoC: cs42l42: Set clock source for both ways of stream
Date:   Tue, 2 Mar 2021 17:04:46 +0000
Message-ID: <20210302170454.39679-8-tanureal@opensource.cirrus.com>
In-Reply-To: <20210302170454.39679-1-tanureal@opensource.cirrus.com>
References: <20210302170454.39679-1-tanureal@opensource.cirrus.com>
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Move the enable/disable of clocks to cs42l42_mute_stream so the record
path also get clocks.

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
---
 sound/soc/codecs/cs42l42.c | 85 +++++++++++++++++++++-----------------
 sound/soc/codecs/cs42l42.h |  1 +
 2 files changed, 48 insertions(+), 38 deletions(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index 663a6a8104171..670f28f09ae01 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -786,52 +786,62 @@ static int cs42l42_set_sysclk(struct snd_soc_dai *dai,
 	return 0;
 }
 
-static int cs42l42_mute(struct snd_soc_dai *dai, int mute, int direction)
+static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
 {
 	struct snd_soc_component *component = dai->component;
 	unsigned int regval;
 	u8 fullScaleVol;
 
 	if (mute) {
-		/* Mark SCLK as not present to turn on the internal
-		 * oscillator.
-		 */
-		snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
-						CS42L42_SCLK_PRESENT_MASK, 0);
-
-		snd_soc_component_update_bits(component, CS42L42_PLL_CTL1,
-				CS42L42_PLL_START_MASK,
-				0 << CS42L42_PLL_START_SHIFT);
-
 		/* Mute the headphone */
-		snd_soc_component_update_bits(component, CS42L42_HP_CTL,
-				CS42L42_HP_ANA_AMUTE_MASK |
-				CS42L42_HP_ANA_BMUTE_MASK,
-				CS42L42_HP_ANA_AMUTE_MASK |
-				CS42L42_HP_ANA_BMUTE_MASK);
+		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+			snd_soc_component_update_bits(component, CS42L42_HP_CTL,
+						      CS42L42_HP_ANA_AMUTE_MASK |
+						      CS42L42_HP_ANA_BMUTE_MASK,
+						      CS42L42_HP_ANA_AMUTE_MASK |
+						      CS42L42_HP_ANA_BMUTE_MASK);
+
+		cs42l42->stream_use &= ~(1 << stream);
+		if(!cs42l42->stream_use) {
+			/*
+			 * Switch to the internal oscillator.
+			 * SCLK must remain running until after this clock switch.
+			 * Without a source of clock the I2C bus doesn't work.
+			 */
+			snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
+						      CS42L42_SCLK_PRESENT_MASK, 0);
+			snd_soc_component_update_bits(component, CS42L42_PLL_CTL1,
+						      CS42L42_PLL_START_MASK, 0);
+		}
 	} else {
-		snd_soc_component_update_bits(component, CS42L42_PLL_CTL1,
-				CS42L42_PLL_START_MASK,
-				1 << CS42L42_PLL_START_SHIFT);
-		/* Read the headphone load */
-		regval = snd_soc_component_read(component, CS42L42_LOAD_DET_RCSTAT);
-		if (((regval & CS42L42_RLA_STAT_MASK) >>
-			CS42L42_RLA_STAT_SHIFT) == CS42L42_RLA_STAT_15_OHM) {
-			fullScaleVol = CS42L42_HP_FULL_SCALE_VOL_MASK;
-		} else {
-			fullScaleVol = 0;
+		if (!cs42l42->stream_use) {
+			/* SCLK must be running before codec unmute */
+			snd_soc_component_update_bits(component, CS42L42_PLL_CTL1,
+						      CS42L42_PLL_START_MASK, 1);
+
+			/* Mark SCLK as present, turn off internal oscillator */
+			snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
+						      CS42L42_SCLK_PRESENT_MASK,
+						      CS42L42_SCLK_PRESENT_MASK);
 		}
+		cs42l42->stream_use |= 1 << stream;
+
+		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			/* Read the headphone load */
+			regval = snd_soc_component_read(component, CS42L42_LOAD_DET_RCSTAT);
+			if (((regval & CS42L42_RLA_STAT_MASK) >> CS42L42_RLA_STAT_SHIFT) ==
+			    CS42L42_RLA_STAT_15_OHM) {
+				fullScaleVol = CS42L42_HP_FULL_SCALE_VOL_MASK;
+			} else {
+				fullScaleVol = 0;
+			}
 
-		/* Un-mute the headphone, set the full scale volume flag */
-		snd_soc_component_update_bits(component, CS42L42_HP_CTL,
-				CS42L42_HP_ANA_AMUTE_MASK |
-				CS42L42_HP_ANA_BMUTE_MASK |
-				CS42L42_HP_FULL_SCALE_VOL_MASK, fullScaleVol);
-
-		/* Mark SCLK as present, turn off internal oscillator */
-		snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH,
-				CS42L42_SCLK_PRESENT_MASK,
-				CS42L42_SCLK_PRESENT_MASK);
+			/* Un-mute the headphone, set the full scale volume flag */
+			snd_soc_component_update_bits(component, CS42L42_HP_CTL,
+						      CS42L42_HP_ANA_AMUTE_MASK |
+						      CS42L42_HP_ANA_BMUTE_MASK |
+						      CS42L42_HP_FULL_SCALE_VOL_MASK, fullScaleVol);
+		}
 	}
 
 	return 0;
@@ -846,8 +856,7 @@ static const struct snd_soc_dai_ops cs42l42_ops = {
 	.hw_params	= cs42l42_pcm_hw_params,
 	.set_fmt	= cs42l42_set_dai_fmt,
 	.set_sysclk	= cs42l42_set_sysclk,
-	.mute_stream	= cs42l42_mute,
-	.no_capture_mute = 1,
+	.mute_stream	= cs42l42_mute_stream,
 };
 
 static struct snd_soc_dai_driver cs42l42_dai = {
diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h
index e17a0c0aeb4a0..59e6eccb8d731 100644
--- a/sound/soc/codecs/cs42l42.h
+++ b/sound/soc/codecs/cs42l42.h
@@ -769,6 +769,7 @@ struct  cs42l42_private {
 	u8 bias_thresholds[CS42L42_NUM_BIASES];
 	u8 hs_bias_ramp_rate;
 	u8 hs_bias_ramp_time;
+	u8 stream_use;
 };
 
 #endif /* __CS42L42_H__ */
-- 
2.30.1