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 <[email protected]> Acked-by: Alex Deucher <[email protected]> Signed-off-by: Wolfram Sang <[email protected]>
josf · Jun 29, 2018 · 2173ed0 · 2173ed0
1 parent 2a2c8ee
commit 2173ed0
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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;