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

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Date:	Fri, 31 Jul 2015 10:08:49 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Hans de Goede <hdegoede@...hat.com>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Initialization of TPPS/2 IBM TrackPoint in too slow

On Fri, Jul 31, 2015 at 06:59:21PM +0200, Pali Rohár wrote:
> 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?

Did you abandon your trusty Dell with ALPS? ;)

Yes, I think we should limit the number of protocols that we probe on
pass-through port to standard PS/2 flavors + TPPS/2 since I have never
seen anything else there.

Thanks.

-- 
Dmitry
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