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

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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>
This commit is contained in:
Wolfram Sang 2018-06-16 22:37:57 +09:00 committed by Wolfram Sang
parent 2a2c8ee2d7
commit 2173ed0adc
1 changed files with 5 additions and 0 deletions
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drivers/i2c/algos/i2c-algo-bit.c
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@ -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;