From: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> commit a284e11c371e446371675668d8c8120a27227339 upstream. This increment of rmi_smbus in rmi_smb_read/write_block() causes garbage to be read/written. The first read of SMB_MAX_COUNT bytes is fine, but after that it is nonsense. Trial-and-error showed that by dropping the increment of rmiaddr everything is fine and the F54 function properly works. I tried a hack with rmi_smb_write_block() as well (writing to the same F54 touchpad data area, then reading it back), and that suggests that there too the rmiaddr increment has to be dropped. It makes sense that if it has to be dropped for read, then it has to be dropped for write as well. It looks like the initial work with F54 was done using i2c, not smbus, and it seems nobody ever tested F54 with smbus. The other functions all read/write less than SMB_MAX_COUNT as far as I can tell, so this issue was never noticed with non-F54 functions. With this change I can read out the touchpad data correctly on my Lenovo X1 Carbon 6th Gen laptop. Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Link: https://lore.kernel.org/r/8dd22e21-4933-8e9c-a696-d281872c8de7@xxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/input/rmi4/rmi_smbus.c | 2 -- 1 file changed, 2 deletions(-) --- a/drivers/input/rmi4/rmi_smbus.c +++ b/drivers/input/rmi4/rmi_smbus.c @@ -166,7 +166,6 @@ static int rmi_smb_write_block(struct rm /* prepare to write next block of bytes */ cur_len -= SMB_MAX_COUNT; databuff += SMB_MAX_COUNT; - rmiaddr += SMB_MAX_COUNT; } exit: mutex_unlock(&rmi_smb->page_mutex); @@ -218,7 +217,6 @@ static int rmi_smb_read_block(struct rmi /* prepare to read next block of bytes */ cur_len -= SMB_MAX_COUNT; databuff += SMB_MAX_COUNT; - rmiaddr += SMB_MAX_COUNT; } retval = 0;
