lkml.org 
[lkml]   [2015]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3.12 109/123] Input: psmouse - add small delay for IBM trackpoint pass-through mode
Date
From: Stefan Assmann <sassmann@kpanic.de>

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@kpanic.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Oliver Neukum <ONeukum@suse.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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


\
 
 \ /
  Last update: 2015-10-28 15:21    [W:0.532 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site