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i2c: i801: Fix a refactoring that broke a touchpad on Lenovo P1

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Commit 857cc04cdf ("i2c: i801: Add helper i801_get_block_len")
introduced a slight functional change: the status variable is now
overwritten with the length of an SMBUS tranasaction,
even in case of success.

This breaks the touchpad on at least my Lenovo P1:

rmi4_physical rmi4-00: Read PDT entry at 0x00e9 failed, code: -6.
rmi4_physical rmi4-00: RMI initial reset failed! Continuing in spite of this.
rmi4_physical rmi4-00: Read PDT entry at 0x00e9 failed, code: -6.
rmi4_physical rmi4-00: IRQ counting failed with code -6.

Fixes: 857cc04cdf ("i2c: i801: Add helper i801_get_block_len")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Maxim Levitsky 2024-03-21 10:19:19 -04:00 committed by Andi Shyti
parent 4cece76496
commit d1ef7a9ca8
1 changed files with 4 additions and 3 deletions
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7
drivers/i2c/busses/i2c-i801.c
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@ -536,11 +536,12 @@ static int i801_block_transaction_by_block(struct i801_priv *priv,
if (read_write == I2C_SMBUS_READ ||
command == I2C_SMBUS_BLOCK_PROC_CALL) {
status = i801_get_block_len(priv);
if (status < 0)
len = i801_get_block_len(priv);
if (len < 0) {
status = len;
goto out;
}
len = status;
data->block[0] = len;
inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
for (i = 0; i < len; i++)