Date:	Wed, 23 Jul 2014 13:29:50 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Nick Dyer <nick.dyer@...ev.co.uk>,
	Yufeng Shen <miletus@...gle.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH 00/15] atmel_mxt_ts - device tree, bootloader, etc

On Wed, Jul 23, 2014 at 11:22:54AM -0600, Stephen Warren wrote:
> On 07/23/2014 09:30 AM, Nick Dyer wrote:
> > On 22/07/14 21:34, Stephen Warren wrote:
> >> Unfortunately, I still can't get these to work on my system.
> >>
> >> Per your "Re: atmel_mxt_ts: defaulting irqflags to
> >> IRQF_TRIGGER_FALLING", I set up the IRQ type in the Tegra DT file, and
> >> then applied this series on top of next-20140721. The driver appears to
> >> initialize OK, but neither X nor evtest see any events from the device.
> >> The IRQ count in /proc/interrupts doesn't increase when I touch the
> >> touchpad, but does when I press it hard enough to trigger the physical
> >> button.
> > 
> > You're using the T19/GPIO support, then? In which case, there appears to be
> > something wrong on the touch controller rather than the driver itself.
> 
> I assume I'm using T19, since there's a physical click action on the
> touchpad along with the normal touch detection.
> 
> >> A boot log with debug enabled follows. No additional kernel log
> >> messages are generated by touches or clicks.
> > 
> > Perhaps I should add some debug to mxt_input_button() - currently it will
> > not debug the fact that a click is received, although I guess that you will
> > see it in getevent.
> > 
> >> Do you have any idea what I should try?
> > 
> > I am suspicious that it may be that the power sequencing isn't quite right,
> > which sometimes leads to parts of the chip not working properly (eg GPIO
> > buttons working, but no touch).
> > 
> > The patch "use deep sleep when stopped" removes the reset on every resume
> > (which would otherwise kill resume performance). But that reset tends to
> > paper over a device which hasn't been powered up properly in the first place.
> > 
> > Could you try issuing a manual reset and see if the touch starts working? I
> > would normally do this by compiling our obp-utils software from
> > https://github.com/atmel-maxtouch/obp-utils using ndk-build and doing
> > something like:
> > 
> > mxt-app -d i2c-dev:1-004b --reset
> > 
> > (you need CONFIG_I2C_DEBUG to make /dev/i2c-1 appear)
> 
> That didn't make any difference.
> 
> I also tried the tool interactively. the "Display raw (M)essages" option
> never displayed anything, and the couple of self-tests I tried just
> timed out. "Read (I)nfo block" did display some values that seemed like
> they might be correct rather than random data.
> 
> Interestingly though, I did bisect the series and found "Input:
> atmel_mxt_ts - use deep sleep mode when stopped" causes the problem. If
> I apply the whole series and revert that one patch, the touchpad works
> for mouse movement, but interestingly not for taps or physical clicks.

I ended up applying everything but the "deep sleep" patch. I wonder if
you have any keys defined to indicate that it is a touchpad and activate
tap-to-click support in userspace.

Thanks.

-- 
Dmitry
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