[alsa-devel] [PATCH] ASoC: AMD: Configure master codec on all playback/capture cases

[Agrawal, Akshu]

In the system design da7219 is the master codec and clocks are
generated by it.
Bclk is to be generated at the required rate for other codecs used when
da7219 is acting only as clock master. For this call hw_params of da7219
during playback/capture on non da7219 codecs.

Being able to set bclk at lower rate also fixes noise issue observed on
some dmics.

Signed-off-by: Akshu Agrawal <akshu.agrawal at amd.com>
---
 sound/soc/amd/acp-da7219-max98357a.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/sound/soc/amd/acp-da7219-max98357a.c b/sound/soc/amd/acp-da7219-max98357a.c
index a5daad973ce5..ad327415290a 100644
--- a/sound/soc/amd/acp-da7219-max98357a.c
+++ b/sound/soc/amd/acp-da7219-max98357a.c
@@ -45,6 +45,7 @@
 #define CZ_PLAT_CLK 48000000
 #define DUAL_CHANNEL		2
 
+static struct snd_soc_dai *codec_dai;
 static struct snd_soc_jack cz_jack;
 static struct clk *da7219_dai_clk;
 extern int bt_uart_enable;
@@ -53,8 +54,10 @@ static int cz_da7219_init(struct snd_soc_pcm_runtime *rtd)
 {
 	int ret;
 	struct snd_soc_card *card = rtd->card;
-	struct snd_soc_dai *codec_dai = rtd->codec_dai;
-	struct snd_soc_component *component = codec_dai->component;
+	struct snd_soc_component *component;
+
+	codec_dai = rtd->codec_dai;
+	component = codec_dai->component;
 
 	dev_info(rtd->dev, "codec dai name = %s\n", codec_dai->name);
 
@@ -255,6 +258,16 @@ static void cz_dmic_shutdown(struct snd_pcm_substream *substream)
 	da7219_clk_disable();
 }
 
+static static int cz_da7219_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *params)
+{
+	/* da7219 Codec is clock master so setup as per the needs */
+	if (codec_dai->driver->ops->hw_params)
+		return codec_dai->driver->ops->hw_params(substream, params,
+							 codec_dai);
+	return 0;
+}
+
 static const struct snd_soc_ops cz_da7219_play_ops = {
 	.startup = cz_da7219_play_startup,
 	.shutdown = cz_da7219_shutdown,
@@ -268,16 +281,19 @@ static const struct snd_soc_ops cz_da7219_cap_ops = {
 static const struct snd_soc_ops cz_max_play_ops = {
 	.startup = cz_max_startup,
 	.shutdown = cz_max_shutdown,
+	.hw_params = cz_da7219_hw_params,
 };
 
 static const struct snd_soc_ops cz_dmic0_cap_ops = {
 	.startup = cz_dmic0_startup,
 	.shutdown = cz_dmic_shutdown,
+	.hw_params = cz_da7219_hw_params,
 };
 
 static const struct snd_soc_ops cz_dmic1_cap_ops = {
 	.startup = cz_dmic1_startup,
 	.shutdown = cz_dmic_shutdown,
+	.hw_params = cz_da7219_hw_params,
 };
 
 static struct snd_soc_dai_link cz_dai_7219_98357[] = {
-- 
2.17.1