diff --git a/drivers/i2c/busses/i2c-sibyte.c b/drivers/i2c/busses/i2c-sibyte.c
index 3d76a188e42f..0fe505d7abe9 100644
--- a/drivers/i2c/busses/i2c-sibyte.c
+++ b/drivers/i2c/busses/i2c-sibyte.c
@@ -94,7 +94,7 @@ static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
 		}
 		break;
 	default:
-		return -1;      /* XXXKW better error code? */
+		return -EOPNOTSUPP;
 	}
 
 	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
@@ -104,7 +104,7 @@ static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
 	if (error & M_SMB_ERROR) {
 		/* Clear error bit by writing a 1 */
 		csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
-		return -1;      /* XXXKW better error code? */
+		return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO;
 	}
 
 	if (data_bytes == 1)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 1cca2631e5b3..0815e10da7c6 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1428,13 +1428,12 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
 	if (!(adapter->class & driver->class))
 		goto exit_free;
 
-	/* Stop here if we can't use SMBUS_QUICK */
-	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) {
+	/* Stop here if the bus doesn't support probing */
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE)) {
 		if (address_list[0] == I2C_CLIENT_END)
 			goto exit_free;
 
-		dev_warn(&adapter->dev, "SMBus Quick command not supported, "
-			 "can't probe for chips\n");
+		dev_warn(&adapter->dev, "Probing not supported\n");
 		err = -EOPNOTSUPP;
 		goto exit_free;
 	}