From: Jean Delvare Date: Sat, 13 Mar 2010 19:56:53 +0000 (+0100) Subject: i2c-i801: Don't use the block buffer for I2C block writes X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c074c39d62306efa5ba7c69c1a1531bc7333d252;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Jean Delvare Cc: Oleg Ryjkov Cc: stable@kernel.org --- diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c index 9da5b05cdb52..299b918455a3 100644 --- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -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);