[alsa-devel] [v3] ASoC: AMD: Configure wclk and bclk of master codec

[Agrawal, Akshu]

With CCF support in da7219, we can now set the correct rate of
wclk and bclk.

Signed-off-by: Akshu Agrawal <akshu.agrawal at amd.com>
---
v2: Removed clk set rate and enable/disable from da7219 ops as
da7219 codec takes care of them internally. Clock configuration
kept for those codecs where da7219 acts as master of clock.
As suggested by Adam Thomson.

v3: As per spec, adau7002 bclk to be minimum of 64x of wclk. Hence,
limiting bclk for all codecs. Also, because of this changes done in v2
of this patch have to be brought back.

 sound/soc/amd/acp-da7219-max98357a.c | 66 ++++++++++++++++++----------
 1 file changed, 42 insertions(+), 24 deletions(-)

diff --git a/sound/soc/amd/acp-da7219-max98357a.c b/sound/soc/amd/acp-da7219-max98357a.c
index 8a619a75b3a9..16b0ea3a3d72 100644
--- a/sound/soc/amd/acp-da7219-max98357a.c
+++ b/sound/soc/amd/acp-da7219-max98357a.c
@@ -46,7 +46,8 @@
 #define DUAL_CHANNEL		2
 
 static struct snd_soc_jack cz_jack;
-static struct clk *da7219_dai_clk;
+static struct clk *da7219_dai_wclk;
+static struct clk *da7219_dai_bclk;
 extern bool bt_uart_enable;
 
 static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
@@ -72,7 +73,8 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
 		return ret;
 	}
 
-	da7219_dai_clk = clk_get(component->dev, "da7219-dai-bclk");
+	da7219_dai_wclk = clk_get(component->dev, "da7219-dai-wclk");
+	da7219_dai_bclk = clk_get(component->dev, "da7219-dai-bclk");
 
 	ret = snd_soc_card_jack_new(card, "Headset Jack",
 				SND_JACK_HEADSET | SND_JACK_LINEOUT |
@@ -94,12 +96,15 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
 	return 0;
 }
 
-static int da7219_clk_enable(struct snd_pcm_substream *substream)
+static int da7219_clk_enable(struct snd_pcm_substream *substream,
+			     int wclk_rate, int bclk_rate)
 {
 	int ret = 0;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 
-	ret = clk_prepare_enable(da7219_dai_clk);
+	clk_set_rate(da7219_dai_wclk, wclk_rate);
+	clk_set_rate(da7219_dai_bclk, bclk_rate);
+	ret = clk_prepare_enable(da7219_dai_bclk);
 	if (ret < 0) {
 		dev_err(rtd->dev, "can't enable master clock %d\n", ret);
 		return ret;
@@ -110,7 +115,7 @@ static int da7219_clk_enable(struct snd_pcm_substream *substream)
 
 static void da7219_clk_disable(void)
 {
-	clk_disable_unprepare(da7219_dai_clk);
+	clk_disable_unprepare(da7219_dai_bclk);
 }
 
 static const unsigned int channels[] = {
@@ -151,7 +156,7 @@ static int cz_da7219_play_startup(struct snd_pcm_substream *substream)
 				   &constraints_rates);
 
 	machine->play_i2s_instance = I2S_SP_INSTANCE;
-	return da7219_clk_enable(substream);
+	return 0;
 }
 
 static int cz_da7219_cap_startup(struct snd_pcm_substream *substream)
@@ -173,12 +178,7 @@ static int cz_da7219_cap_startup(struct snd_pcm_substream *substream)
 
 	machine->cap_i2s_instance = I2S_SP_INSTANCE;
 	machine->capture_channel = CAP_CHANNEL1;
-	return da7219_clk_enable(substream);
-}
-
-static void cz_da7219_shutdown(struct snd_pcm_substream *substream)
-{
-	da7219_clk_disable();
+	return 0;
 }
 
 static int cz_max_startup(struct snd_pcm_substream *substream)
@@ -199,12 +199,7 @@ static int cz_max_startup(struct snd_pcm_substream *substream)
 				   &constraints_rates);
 
 	machine->play_i2s_instance = I2S_BT_INSTANCE;
-	return da7219_clk_enable(substream);
-}
-
-static void cz_max_shutdown(struct snd_pcm_substream *substream)
-{
-	da7219_clk_disable();
+	return 0;
 }
 
 static int cz_dmic0_startup(struct snd_pcm_substream *substream)
@@ -225,7 +220,7 @@ static int cz_dmic0_startup(struct snd_pcm_substream *substream)
 				   &constraints_rates);
 
 	machine->cap_i2s_instance = I2S_BT_INSTANCE;
-	return da7219_clk_enable(substream);
+	return 0;
 }
 
 static int cz_dmic1_startup(struct snd_pcm_substream *substream)
@@ -247,10 +242,28 @@ static int cz_dmic1_startup(struct snd_pcm_substream *substream)
 
 	machine->cap_i2s_instance = I2S_SP_INSTANCE;
 	machine->capture_channel = CAP_CHANNEL0;
-	return da7219_clk_enable(substream);
+	return 0;
 }
 
-static void cz_dmic_shutdown(struct snd_pcm_substream *substream)
+static int cz_da7219_params(struct snd_pcm_substream *substream,
+				      struct snd_pcm_hw_params *params)
+{
+	int wclk, bclk;
+
+	wclk = params_rate(params);
+	bclk = wclk * params_channels(params) *
+		snd_pcm_format_width(params_format(params));
+	/* ADAU7002 spec: "The ADAU7002 requires a BCLK rate
+	 * that is minimum of 64x the LRCLK sample rate."
+	 * DA7219 is the only clk source so for all codecs
+	 * we have to limit bclk to 64X lrclk.
+	 */
+	if (bclk < (wclk * 64))
+		bclk = wclk * 64;
+	return da7219_clk_enable(substream, wclk, bclk);
+}
+
+static void cz_da7219_shutdown(struct snd_pcm_substream *substream)
 {
 	da7219_clk_disable();
 }
@@ -258,26 +271,31 @@ static void cz_dmic_shutdown(struct snd_pcm_substream *substream)
 static const struct snd_soc_ops cz_da7219_play_ops = {
 	.startup = cz_da7219_play_startup,
 	.shutdown = cz_da7219_shutdown,
+	.hw_params = cz_da7219_params,
 };
 
 static const struct snd_soc_ops cz_da7219_cap_ops = {
 	.startup = cz_da7219_cap_startup,
 	.shutdown = cz_da7219_shutdown,
+	.hw_params = cz_da7219_params,
 };
 
 static const struct snd_soc_ops cz_max_play_ops = {
 	.startup = cz_max_startup,
-	.shutdown = cz_max_shutdown,
+	.shutdown = cz_da7219_shutdown,
+	.hw_params = cz_da7219_params,
 };
 
 static const struct snd_soc_ops cz_dmic0_cap_ops = {
 	.startup = cz_dmic0_startup,
-	.shutdown = cz_dmic_shutdown,
+	.shutdown = cz_da7219_shutdown,
+	.hw_params = cz_da7219_params,
 };
 
 static const struct snd_soc_ops cz_dmic1_cap_ops = {
 	.startup = cz_dmic1_startup,
-	.shutdown = cz_dmic_shutdown,
+	.shutdown = cz_da7219_shutdown,
+	.hw_params = cz_da7219_params,
 };
 
 static struct snd_soc_dai_link cz_dai_7219_98357[] = {
-- 
2.17.1