[PATCH] ASoC: rt1015: check the return value of regmap_read during i2c probe

[derek.fang at realtek.com]

From: Derek Fang <derek.fang at realtek.com>

In some projects, the device ID register is not read correctly.
This patch helps to verify the issue is caused from i2c host or client.

Signed-off-by: Derek Fang <derek.fang at realtek.com>

diff --git a/sound/soc/codecs/rt1015.c b/sound/soc/codecs/rt1015.c
index ac4c9f43b338..32e6bcf763d1 100644
--- a/sound/soc/codecs/rt1015.c
+++ b/sound/soc/codecs/rt1015.c
@@ -1207,8 +1207,13 @@ static int rt1015_i2c_probe(struct i2c_client *i2c,
 
 	rt1015->hw_config = (i2c->addr == 0x29) ? RT1015_HW_29 : RT1015_HW_28;
 
-	regmap_read(rt1015->regmap, RT1015_DEVICE_ID, &val);
-	if ((val != RT1015_DEVICE_ID_VAL) && (val != RT1015_DEVICE_ID_VAL2)) {
+	ret = regmap_read(rt1015->regmap, RT1015_DEVICE_ID, &val);
+	if (ret) {
+		dev_err(&i2c->dev,
+			"Failed to read device register: %d\n", ret);
+		return ret;
+	} else if ((val != RT1015_DEVICE_ID_VAL) &&
+			(val != RT1015_DEVICE_ID_VAL2)) {
 		dev_err(&i2c->dev,
 			"Device with ID register %x is not rt1015\n", val);
 		return -ENODEV;
-- 
2.17.1