The Intel iMC SMBUS controller can't READ_BYTE. (This seems odd to me -- it supports WRITE_BYTE.) SPD EEPROMs are safe to probe with READ_BYTE_DATA, so fall back to that.
While I'm in here, also show the address that had no probing method for easier debugging. Signed-off-by: Andy Lutomirski <[email protected]> --- drivers/i2c/i2c-core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 991d38d..ea88fc0 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1501,8 +1501,13 @@ static int i2c_default_probe(struct i2c_adapter *adap, unsigned short addr) else if (i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy); + else if ((addr & ~0x0f) == 0x50 + && i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE_DATA)) + err = i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0, + I2C_SMBUS_BYTE_DATA, &dummy); else { - dev_warn(&adap->dev, "No suitable probing method supported\n"); + dev_warn(&adap->dev, "No suitable probing method supported for address 0x%02X\n", + addr); err = -EOPNOTSUPP; } -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
