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

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Message-ID: <20150821081344.GC27391@pali>
Date:	Fri, 21 Aug 2015 10:13:44 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...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 Friday 31 July 2015 20:11:08 Pali Rohár wrote:
> On Friday 31 July 2015 19:30:34 Dmitry Torokhov wrote:
> > 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.
> 
> Ok, then limiting just to TPPS/2 and PS/2 protocols.
> 

Dmitry, do you have some idea how to achieve this?

Modifying psmouse_extensions() function or extending max_proto variable?

-- 
Pali Rohár
pali.rohar@...il.com
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