@@ -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;
}
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 <luto@amacapital.net> --- drivers/i2c/i2c-core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)