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| author |   Heiner Kallweit <hkallweit1@gmail.com> | 2021-05-24 22:12:22 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-27 14:49:39 +0200 |
| commit | 08e5138aa419350d0a168abeac3ecec4b7e779be (patch) | |
| tree | 1042810c665fdea41482054711138703cb91a88e /drivers/misc/eeprom | |
| parent | eeprom: ee1004: Remove usage of i2c_adapter_id in adapter comparison (diff) | |
| download | linux-dev-08e5138aa419350d0a168abeac3ecec4b7e779be.tar.xz linux-dev-08e5138aa419350d0a168abeac3ecec4b7e779be.zip | |
eeprom: ee1004: Improve check for SMBUS features
We have to read 512 bytes only, therefore read performance isn't really
a concern. Don't bother the user if i2c block read isn't supported.
For i2c_smbus_read_i2c_block_data_or_emulated() to work it's sufficient
if I2C_FUNC_SMBUS_READ_I2C_BLOCK or I2C_FUNC_SMBUS_READ_BYTE_DATA is
supported. Therefore remove the check for I2C_FUNC_SMBUS_READ_WORD_DATA.
In addition check for I2C_FUNC_SMBUS_WRITE_BYTE (included in
I2C_FUNC_SMBUS_BYTE) which is needed for setting the page.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/840c668e-6310-e933-e50e-5abeaecfb39c@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/eeprom')
| -rw-r--r-- | drivers/misc/eeprom/ee1004.c | 22 |
1 files changed, 4 insertions, 18 deletions
diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c index b991ab250456..0d497e0e4a51 100644 --- a/drivers/misc/eeprom/ee1004.c +++ b/drivers/misc/eeprom/ee1004.c @@ -167,23 +167,13 @@ static int ee1004_probe(struct i2c_client *client, const struct i2c_device_id *id) { int err, cnr = 0; - const char *slow = NULL; /* Make sure we can operate on this adapter */ if (!i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_BYTE | - I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_BYTE | - I2C_FUNC_SMBUS_READ_WORD_DATA)) - slow = "word"; - else if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_BYTE | - I2C_FUNC_SMBUS_READ_BYTE_DATA)) - slow = "byte"; - else - return -EPFNOSUPPORT; - } + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_READ_I2C_BLOCK) && + !i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_READ_BYTE_DATA)) + return -EPFNOSUPPORT; /* Use 2 dummy devices for page select command */ mutex_lock(&ee1004_bus_lock); @@ -218,10 +208,6 @@ static int ee1004_probe(struct i2c_client *client, dev_info(&client->dev, "%u byte EE1004-compliant SPD EEPROM, read-only\n", EE1004_EEPROM_SIZE); - if (slow) - dev_notice(&client->dev, - "Falling back to %s reads, performance will suffer\n", - slow); return 0; |