linux-kernel - Initialization of TPPS/2 IBM TrackPoint in too slow

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Date:	Fri, 31 Jul 2015 18:59:21 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Hans de Goede <hdegoede@...hat.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Initialization of TPPS/2 IBM TrackPoint in too slow

Hello,

here is output from dmesg for psmouse.ko

[  266.378751] psmouse: calling psmouse_init()
[  267.167150] psmouse serio1: synaptics: queried max coordinates: x [..5676], y [..4758]
[  267.198416] psmouse serio1: synaptics: queried min coordinates: x [1266..], y [1096..]
[  267.260402] psmouse serio1: synaptics: Touchpad model: 1, fw: 8.1, id: 0x1e2b1, caps: 0xf002a3/0x943300/0x12e800, board 
id: 3072, fw id: 2560
[  267.260418] psmouse serio1: synaptics: serio: Synaptics pass-through port at isa0060/serio1/input0
[  267.299629] input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input39
[  268.697333] psmouse serio4: cypress_ps2: send extension cmd 0x00, [0 0 0 0]
[  269.259351] psmouse serio4: cypress_ps2: Command 0x00 response data (0x): 00 00 14
[  269.562762] psmouse serio4: alps: E6 report: 00 00 64
[  269.825915] psmouse serio4: alps: E7 report: 10 00 64
[  270.086671] psmouse serio4: alps: EC report: 10 00 64
[  270.125866] psmouse serio4: alps: Likely not an ALPS touchpad: E7=10 00 64, EC=10 00 64
[  270.388147] psmouse serio4: elantech: unexpected magic knock result 0x00, 0x02, 0x64.
[  271.390241] psmouse serio4: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 3/3
[  271.586156] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/serio4/input/input40

As you can see it takes about 5 seconds to initialize TrackPoint input
device. And about 3 seconds from stage after synaptics export serio
device. I think this is just because of trying to detect device type.
Is there any way how to speed it up? Maybe for synaptics serio devices
try to probe for TPPS/2 at first?

-- 
Pali Rohár
pali.rohar@...il.com

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