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i2c-i801: Don't use the block buffer for I2C block writes 

Experience has shown that the block buffer can only be used for SMBus
(not I2C) block transactions, even though the datasheet doesn't
mention this limitation.

Reported-by: Felix Rubinstein <felixru@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Oleg Ryjkov <oryjkov@gmail.com>
Cc: stable@kernel.org
This commit is contained in:
Jean Delvare 2010-03-13 20:56:53 +01:00
parent 8e4b980c28
commit c074c39d62
1 changed files with 4 additions and 2 deletions
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6
drivers/i2c/busses/i2c-i801.c
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@ -416,9 +416,11 @@ static int i801_block_transaction(union i2c_smbus_data *data, char read_write,
data->block[0] = 32; /* max for SMBus block reads */
}
/* Experience has shown that the block buffer can only be used for
SMBus (not I2C) block transactions, even though the datasheet
doesn't mention this limitation. */
if ((i801_features & FEATURE_BLOCK_BUFFER)
&& !(command == I2C_SMBUS_I2C_BLOCK_DATA
&& read_write == I2C_SMBUS_READ)
&& command != I2C_SMBUS_I2C_BLOCK_DATA
&& i801_set_block_buffer_mode() == 0)
result = i801_block_transaction_by_block(data, read_write,
hwpec);