linux-kernel - [PATCH 2/2] ASoC: da7219: Add recalc_rate function to return DAI clock rate

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Message-ID: <ef671ed1c4a5b86036da5b2adf5be7d79ec56c7d.1546876084.git.Adam.Thomson.Opensource@diasemi.com>
Date:   Mon, 7 Jan 2019 16:11:47 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz>
CC:     Akshu Agrawal <Akshu.Agrawal@....com>,
        Daniel Kurtz <djkurtz@...gle.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Support Opensource <support.opensource@...semi.com>
Subject: [PATCH 2/2] ASoC: da7219: Add recalc_rate function to return DAI
 clock rate

By making MCLK parent of DAI clocks, when querying the rate of the
clock the rate returned is now given from the parent clock so
gives the MCLK rate rather than 0 as previously returned. This is
a bit misleading, and actually there's no major reason why we can't
at least return the DAI WCLK rate, as set in HW, so that's what we
now do.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
---
 sound/soc/codecs/da7219.c | 45 ++++++++++++++++++++++++++++++++++++++++++---
 sound/soc/codecs/da7219.h |  1 +
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 66dd4c2..3a073ca 100644
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -1767,7 +1767,7 @@ static int da7219_dai_clks_prepare(struct clk_hw *hw)
 {
 	struct da7219_priv *da7219 =
 		container_of(hw, struct da7219_priv, dai_clks_hw);
-	struct snd_soc_component *component = da7219->aad->component;
+	struct snd_soc_component *component = da7219->component;
 
 	snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
 				      DA7219_DAI_CLK_EN_MASK,
@@ -1780,7 +1780,7 @@ static void da7219_dai_clks_unprepare(struct clk_hw *hw)
 {
 	struct da7219_priv *da7219 =
 		container_of(hw, struct da7219_priv, dai_clks_hw);
-	struct snd_soc_component *component = da7219->aad->component;
+	struct snd_soc_component *component = da7219->component;
 
 	snd_soc_component_update_bits(component, DA7219_DAI_CLK_MODE,
 				      DA7219_DAI_CLK_EN_MASK, 0);
@@ -1790,7 +1790,7 @@ static int da7219_dai_clks_is_prepared(struct clk_hw *hw)
 {
 	struct da7219_priv *da7219 =
 		container_of(hw, struct da7219_priv, dai_clks_hw);
-	struct snd_soc_component *component = da7219->aad->component;
+	struct snd_soc_component *component = da7219->component;
 	u8 clk_reg;
 
 	clk_reg = snd_soc_component_read32(component, DA7219_DAI_CLK_MODE);
@@ -1798,10 +1798,47 @@ static int da7219_dai_clks_is_prepared(struct clk_hw *hw)
 	return !!(clk_reg & DA7219_DAI_CLK_EN_MASK);
 }
 
+static unsigned long da7219_dai_clks_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct da7219_priv *da7219 =
+		container_of(hw, struct da7219_priv, dai_clks_hw);
+	struct snd_soc_component *component = da7219->component;
+	u8 fs = snd_soc_component_read32(component, DA7219_SR);
+
+	switch (fs & DA7219_SR_MASK) {
+	case DA7219_SR_8000:
+		return 8000;
+	case DA7219_SR_11025:
+		return 11025;
+	case DA7219_SR_12000:
+		return 12000;
+	case DA7219_SR_16000:
+		return 16000;
+	case DA7219_SR_22050:
+		return 22050;
+	case DA7219_SR_24000:
+		return 24000;
+	case DA7219_SR_32000:
+		return 32000;
+	case DA7219_SR_44100:
+		return 44100;
+	case DA7219_SR_48000:
+		return 48000;
+	case DA7219_SR_88200:
+		return 88200;
+	case DA7219_SR_96000:
+		return 96000;
+	default:
+		return 0;
+	}
+}
+
 static const struct clk_ops da7219_dai_clks_ops = {
 	.prepare = da7219_dai_clks_prepare,
 	.unprepare = da7219_dai_clks_unprepare,
 	.is_prepared = da7219_dai_clks_is_prepared,
+	.recalc_rate = da7219_dai_clks_recalc_rate,
 };
 
 static int da7219_register_dai_clks(struct snd_soc_component *component)
@@ -1825,6 +1862,7 @@ static int da7219_register_dai_clks(struct snd_soc_component *component)
 
 	init.name = pdata->dai_clks_name;
 	init.ops = &da7219_dai_clks_ops;
+	init.flags = CLK_GET_RATE_NOCACHE;
 	da7219->dai_clks_hw.init = &init;
 
 	dai_clks = devm_clk_register(dev, &da7219->dai_clks_hw);
@@ -1912,6 +1950,7 @@ static int da7219_probe(struct snd_soc_component *component)
 	unsigned int rev;
 	int ret;
 
+	da7219->component = component;
 	mutex_init(&da7219->ctrl_lock);
 	mutex_init(&da7219->pll_lock);
 
diff --git a/sound/soc/codecs/da7219.h b/sound/soc/codecs/da7219.h
index 3a00686..366cf46 100644
--- a/sound/soc/codecs/da7219.h
+++ b/sound/soc/codecs/da7219.h
@@ -809,6 +809,7 @@ enum da7219_supplies {
 
 /* Private data */
 struct da7219_priv {
+	struct snd_soc_component *component;
 	struct da7219_aad_priv *aad;
 	struct da7219_pdata *pdata;
 
-- 
1.9.1