i2c: algo-bit: init the bus to a known state
Ensure the bus is free when we register the adapter. Before the SCL/SDA wires were in an unknown state. It used to work because sending a byte has a retry mechanism which was triggered if the bus was initially in a non-free state. But the graceful way to do it is to initialize correctly. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -649,6 +649,11 @@ static int __i2c_bit_add_bus(struct i2c_adapter *adap,
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if (bit_adap->getscl == NULL)
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if (bit_adap->getscl == NULL)
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adap->quirks = &i2c_bit_quirk_no_clk_stretch;
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adap->quirks = &i2c_bit_quirk_no_clk_stretch;
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/* Bring bus to a known state. Looks like STOP if bus is not free yet */
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setscl(bit_adap, 1);
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udelay(bit_adap->udelay);
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setsda(bit_adap, 1);
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ret = add_adapter(adap);
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ret = add_adapter(adap);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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