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 that long
before reading the value.
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>
---
v2: rework the patch based on mailing list discussion.
Just wait before reading the register.
v3: Drop the extra read
sound/soc/codecs/rt5645.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/soc/codecs/rt5645.c b/sound/soc/codecs/rt5645.c
index 23cc2cb8393f..5f24df4fae8e 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",
@@ -3784,6 +3786,12 @@ static int rt5645_i2c_probe(struct i2c_client *i2c,
ret);
return ret;
}
+
+ /*
+ * Read after 400msec, as it is the interval required between
+ * read and power On.
+ */
+ msleep(TIME_TO_POWER_MS);
regmap_read(regmap, RT5645_VENDOR_ID2, &val);
switch (val) {
--
2.13.6
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