Commit da498f69 authored by Stefan Assmann's avatar Stefan Assmann Committed by Sasha Levin

Input: psmouse - add small delay for IBM trackpoint pass-through mode

[ Upstream commit 66bc2f51 ]

There are trackpoint devices that fail to respond to the PS2 command
PSMOUSE_CMD_GETID if immediately queried after the parent device is
deactivated. Add a small delay for the hardware to get in a sane state
before sending any PS2 commands.

One example of such a system is:
Lenovo ThinkPad X120e, model 30515QG
synaptics: Touchpad model: 1, fw: 8.0, id: 0x1e2b1, caps: 0xd001a3/0x940300/0x121c00, board id: 1811, fw id: 797391
Signed-off-by: default avatarStefan Assmann <sassmann@kpanic.de>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent 67d9383a
......@@ -1473,6 +1473,10 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
if (error)
goto err_clear_drvdata;
/* give PT device some time to settle down before probing */
if (serio->id.type == SERIO_PS_PSTHRU)
usleep_range(10000, 15000);
if (psmouse_probe(psmouse) < 0) {
error = -ENODEV;
goto err_close_serio;
......
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