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Revert "i2c: algo-bit: init the bus to a known state" 

This reverts commit 3e5f06bed7. As per
bugzilla #200045, this caused a regression. I don't really see a way to
fix it without having the hardware. So, revert the patch and I will fix
the issue I was seeing originally in the i2c-gpio driver itself. I
couldn't find new users of this algorithm since, so there should be no
one depending on the new behaviour.

Reported-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Fixes: 3e5f06bed7 ("i2c: algo-bit: init the bus to a known state")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
4.18.x+fslc
Wolfram Sang 2018-06-16 22:37:56 +09:00 committed by Wolfram Sang
parent 7daf201d7f
commit 2a2c8ee2d7
1 changed files with 0 additions and 5 deletions
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5
drivers/i2c/algos/i2c-algo-bit.c
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@ -647,11 +647,6 @@ static int __i2c_bit_add_bus(struct i2c_adapter *adap,
if (bit_adap->getscl == NULL)
adap->quirks = &i2c_bit_quirk_no_clk_stretch;
/* Bring bus to a known state. Looks like STOP if bus is not free yet */
setscl(bit_adap, 1);
udelay(bit_adap->udelay);
setsda(bit_adap, 1);
ret = add_adapter(adap);
if (ret < 0)
return ret;