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

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Message-ID: <20150731173034.GH5613@dtor-ws>
Date:	Fri, 31 Jul 2015 10:30:34 -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 07:17:02PM +0200, Pali Rohár wrote:
> On Friday 31 July 2015 19:08:49 Dmitry Torokhov wrote:
> > 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? ;)
> > 
> 
> No, I'm not going to do that :-) 
> 
> > 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.
> 
> And If not limiting, at least changing order and preferring TPPS/2.

Umm, that is not something I'll do lightly as it may lead to
regressions: some devices are confused by other's probes and assing even
more psmouse_reset() calls will slow down boot even more.

Thanks.

-- 
Dmitry
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