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authorJean Delvare <khali@linux-fr.org>2010-03-13 20:56:53 +0100
committerJean Delvare <khali@linux-fr.org>2010-03-13 20:56:53 +0100
commitc074c39d62306efa5ba7c69c1a1531bc7333d252 (patch)
tree7d17d240821deada26d2221ca51fb1b3f1bb533d /drivers
parent8e4b980c28c91cfe9d0ce0431bc0af56e146b49e (diff)
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
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/i2c-i801.c6
1 files changed, 4 insertions, 2 deletions
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);

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