From: Akshu Agrawal <akshu.agrawal@xxxxxxx>
Minimum time required between power On of codec and read
of RT5645_VENDOR_ID2 is 400msec. We should wait and attempt
before erroring out.
BUG=b:66978383
TEST=Cold boot the device and check for sound device.
Signed-off-by: Akshu Agrawal <akshu.agrawal@xxxxxxx>
Signed-off-by: Bard Liao <bardliao@xxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
sound/soc/codecs/rt5645.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index 23cc2cb..2da0b33 100644
--- a/sound/soc/codecs/rt5645.c
+++ b/sound/soc/codecs/rt5645.c
@@ -55,6 +55,8 @@ MODULE_PARM_DESC(quirk, "RT5645 pdata quirk override");
#define RT5645_HWEQ_NUM 57
+#define TIME_TO_POWER_MS 400
+
static const struct regmap_range_cfg rt5645_ranges[] = {
{
.name = "PR",
@@ -3712,6 +3714,7 @@ static int rt5645_i2c_probe(struct i2c_client *i2c,
int ret, i;
unsigned int val;
struct regmap *regmap;
+ int timeout = TIME_TO_POWER_MS;
rt5645 = devm_kzalloc(&i2c->dev, sizeof(struct rt5645_priv),
GFP_KERNEL);
@@ -3786,6 +3789,15 @@ static int rt5645_i2c_probe(struct i2c_client *i2c,
}
regmap_read(regmap, RT5645_VENDOR_ID2, &val);
+ /*
+ * Read for 400msec, as it is the interval required between
+ * read and power On.
+ */
+ while (val != RT5645_DEVICE_ID && val != RT5650_DEVICE_ID && --timeout) {
+ msleep(1);
+ regmap_read(regmap, RT5645_VENDOR_ID2, &val);
+ }
+
switch (val) {
case RT5645_DEVICE_ID:
rt5645->regmap = devm_regmap_init_i2c(i2c, &rt5645_regmap);
--
2.5.5
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