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@xxxxxxxxxxxxxx>
---
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
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