From ae3936ed1af0224a2d38d6b6b1ee62fb8f4c3a5c Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 13 Mar 2010 20:56:53 +0100 Subject: i2c-i801: Don't use the block buffer for I2C block writes commit c074c39d62306efa5ba7c69c1a1531bc7333d252 upstream. 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 Signed-off-by: Jean Delvare Cc: Oleg Ryjkov Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-i801.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index dc7ea32b69a8..177346e093e2 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -413,9 +413,11 @@ 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); -- cgit v1.2.3