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ASoC: rt5663: Delay and retry reading rt5663 ID register 

In the probe, the codec may not be ready for I2C reading or there are some
glitches on the i2c line. So if the i2c reading value is incorrect, it will
read again after delay. This issue is similar the patch
https://patchwork.kernel.org/patch/9681421/. In current project, these 2
devices were connected to the same i2c line, and they met the same problem.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Oder Chiou 2017-11-09 19:28:10 +08:00 committed by Mark Brown
parent 457c25efc5
commit ba68fa3184
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GPG Key ID: 24D68B725D5487D0
1 changed files with 10 additions and 1 deletions
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11
sound/soc/codecs/rt5663.c
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@ -3428,7 +3428,16 @@ 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);