From: Akshu Agrawal <akshu.agrawal@amd.com>
Date: Thu, 9 Nov 2017 17:35:51 +0000 (-0500)
Subject: ASoC: rt5645: Wait for 400msec before concluding on value of RT5645_VENDOR_ID2
X-Git-Tag: v4.15-rc1~118^2~1^2~2^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0c279a590fde66f4307c93ab2d4f680c7f41bbfa;p=linux.git

ASoC: rt5645: Wait for 400msec before concluding on value of RT5645_VENDOR_ID2

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@amd.com>
Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

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) {