4.17-stable review patch. If anyone has any objections, please let me know.
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From: Wolfram Sang wsa+renesas@sang-engineering.com
commit 2a2c8ee2d72c4f1ba0f7fbb02dc74f971df0f934 upstream.
This reverts commit 3e5f06bed72fe72166a6778f630241a893f67799. 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: 3e5f06bed72f ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/i2c/algos/i2c-algo-bit.c | 5 ----- 1 file changed, 5 deletions(-)
--- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -649,11 +649,6 @@ static int __i2c_bit_add_bus(struct i2c_ 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;