From 66bc2f51ef7deabc8b8f3baa98ae64b65e5e973a Mon Sep 17 00:00:00 2001
From: Stefan Assmann <sassmann@kpanic.de>
Date: Wed, 26 Aug 2015 13:11:49 -0700
Subject: [PATCH] Input: psmouse - add small delay for IBM trackpoint
pass-through mode
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: Stefan Assmann <sassmann@kpanic.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/input/mouse/psmouse-base.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index ec34770361501..ad18dab0ac476 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -1540,6 +1540,10 @@ 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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