[alsa-devel] [PATCH] ASoC: rt5663: Delay and retry reading rt5663 ID register

[Oder Chiou]

In the probe, the codec may not be ready for I2C reading. So if the value
is not correct, it will read again after delay.

Signed-off-by: Oder Chiou <oder_chiou at realtek.com>
---
 sound/soc/codecs/rt5663.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
index fcd1643..5985d8e 100644
--- a/sound/soc/codecs/rt5663.c
+++ b/sound/soc/codecs/rt5663.c
@@ -3429,7 +3429,16 @@ static int rt5663_i2c_probe(struct i2c_client *i2c,
 			ret);
 		return ret;
 	}
-	regmap_read(regmap, RT5663_VENDOR_ID_2, &val);
+
+	ret = regmap_read(regmap, RT5663_VENDOR_ID_2, &val);
+	if (ret || (val != RT5663_DEVICE_ID_2 && val != RT5663_DEVICE_ID_1)) {
+		dev_err(&i2c->dev,
+			"Device with ID register %#x is not rt5663,"
+			" retry one time.\n", val);
+		msleep(100);
+		regmap_read(regmap, RT5663_VENDOR_ID_2, &val);
+	}
+
 	switch (val) {
 	case RT5663_DEVICE_ID_2:
 		rt5663->regmap = devm_regmap_init_i2c(i2c, &rt5663_v2_regmap);
-- 
2.7.4