From: Wolfram Sang <wsa+renesas@sang-engineering.com>
Date: Sat, 16 Jun 2018 13:37:57 +0000 (+0900)
Subject: i2c: algos: bit: mention our experience about initial states
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=2173ed0adc7f0473e6b6ad636d8684a0d82da5e9;p=openwrt%2Fstaging%2Fblogic.git

i2c: algos: bit: mention our experience about initial states

So, if somebody wants to re-implement this in the future, we pinpoint to
a problem case.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
---

diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index 0c0eb16d710f..6ec65adaba49 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -647,6 +647,11 @@ static int __i2c_bit_add_bus(struct i2c_adapter *adap,
 	if (bit_adap->getscl == NULL)
 		adap->quirks = &i2c_bit_quirk_no_clk_stretch;
 
+	/*
+	 * We tried forcing SCL/SDA to an initial state here. But that caused a
+	 * regression, sadly. Check Bugzilla #200045 for details.
+	 */
+
 	ret = add_adapter(adap);
 	if (ret < 0)
 		return ret;