[alsa-devel] [PATCH 2/4] ASoC: rt5670: check if asrc is useable

[bardliao at realtek.com]

From: Bard Liao <bardliao at realtek.com>

To use ASRC, the sysclk should be faster than 384 times sample
rate of I2S1.

Signed-off-by: Bard Liao <bardliao at realtek.com>
---
 sound/soc/codecs/rt5670.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt5670.c b/sound/soc/codecs/rt5670.c
index 85dc210..898b17f 100644
--- a/sound/soc/codecs/rt5670.c
+++ b/sound/soc/codecs/rt5670.c
@@ -575,6 +575,17 @@ static int is_using_asrc(struct snd_soc_dapm_widget *source,
 
 }
 
+static int can_use_asrc(struct snd_soc_dapm_widget *source,
+			 struct snd_soc_dapm_widget *sink)
+{
+	struct rt5670_priv *rt5670 = snd_soc_codec_get_drvdata(source->codec);
+
+	if (rt5670->sysclk > rt5670->lrck[RT5670_AIF1] * 384)
+		return 1;
+
+	return 0;
+}
+
 /* Digital Mixer */
 static const struct snd_kcontrol_new rt5670_sto1_adc_l_mix[] = {
 	SOC_DAPM_SINGLE("ADC1 Switch", RT5670_STO1_ADC_MIXER,
@@ -1638,8 +1649,8 @@ static const struct snd_soc_dapm_route rt5670_dapm_routes[] = {
 	{ "DAC Mono Right Filter", NULL, "DAC MONO R ASRC", is_using_asrc },
 	{ "DAC Stereo1 Filter", NULL, "DAC STO ASRC", is_using_asrc },
 
-	{ "I2S1", NULL, "I2S1 ASRC" },
-	{ "I2S2", NULL, "I2S2 ASRC" },
+	{ "I2S1", NULL, "I2S1 ASRC", can_use_asrc},
+	{ "I2S2", NULL, "I2S2 ASRC", can_use_asrc},
 
 	{ "DMIC1", NULL, "DMIC L1" },
 	{ "DMIC1", NULL, "DMIC R1" },
-- 
1.8.1.1.439.g50a6b54