This is a note to let you know that I've just added the patch titled
i2c: i801: Remove i801_set_block_buffer_mode
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-i801-remove-i801_set_block_buffer_mode.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8ff0daa9734dddd3ece3fd3cb2acce2cf614bfbd
Author: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Thu Nov 18 23:58:17 2021 +0100
i2c: i801: Remove i801_set_block_buffer_mode
[ Upstream commit 1e1d6582f483a4dba4ea03445e6f2f05d9de5bcf ]
If FEATURE_BLOCK_BUFFER is set then bit SMBAUXCTL_E32B is supported
and there's no benefit in reading it back. Origin of this check
seems to be 14 yrs ago when people were not completely sure which
chip versions support the block buffer mode.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>
Tested-by: Jean Delvare <jdelvare@xxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Stable-dep-of: c1c9d0f6f7f1 ("i2c: i801: Fix block process call transactions")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 50c972b3efe0..21ed6d98c048 100644
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -528,9 +528,11 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
return -EOPNOTSUPP;
}
+ /* Set block buffer mode */
+ outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
+
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
- /* Use 32-byte buffer to process this transaction */
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
outb_p(len, SMBHSTDAT0(priv));
@@ -768,14 +770,6 @@ static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
return i801_check_post(priv, status);
}
-static int i801_set_block_buffer_mode(struct i801_priv *priv)
-{
- outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
- if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
- return -EIO;
- return 0;
-}
-
/* Block transaction function */
static int i801_block_transaction(struct i801_priv *priv,
union i2c_smbus_data *data, char read_write,
@@ -805,9 +799,8 @@ static int i801_block_transaction(struct i801_priv *priv,
/* 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 ((priv->features & FEATURE_BLOCK_BUFFER)
- && command != I2C_SMBUS_I2C_BLOCK_DATA
- && i801_set_block_buffer_mode(priv) == 0)
+ if ((priv->features & FEATURE_BLOCK_BUFFER) &&
+ command != I2C_SMBUS_I2C_BLOCK_DATA)
result = i801_block_transaction_by_block(priv, data,
read_write,
command, hwpec);
