From: Stefan Assmann <sassmann@xxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 66bc2f51ef7deabc8b8f3baa98ae64b65e5e973a upstream.
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@xxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Oliver Neukum <ONeukum@xxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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 cff065f6261c..de3d92077c77 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -1441,6 +1441,10 @@ 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;
--
2.6.2
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