[Gta04-owner] 3.0.8 kernel for Android/Replicant

Paul Kocialkowski paulk at paulk.fr
Thu Dec 6 21:03:47 CET 2012

Le jeudi 06 décembre 2012 à 08:41 +1100, NeilBrown a écrit :
> On Wed, 05 Dec 2012 22:18:43 +0100 Paul Kocialkowski <paulk at paulk.fr> wrote:
> > The problem here seems to be that the IRQ isn't triggered everytime the
> > pend is down on the touchscreen.
> > 
> > > Thanks again for your generous help!
> > > My code is still up at:
> > > http://git.paulk.fr/gitweb/?p=replicant/kernel-gta04.git;a=shortlog;h=refs/heads/replicant-4.0
> I just tested the touch screen on my device  with your kernel and couldn't
> fault it.

Well, I checked with the 3.2 kernel from Replicant 2.3, it works
perfectly. Then I switched back to the 3.0.8 kernel and I do have
dropped IRQ interrupts.

The latest HEAD of the kernel repo is

I also tried backporting the 3.2 tsc2007 driver to 3.0.8, it didn't work
any better (still touch events dropped). 

> I uncommented the printk  at the end of ts_get_pendown_state()  in
> board-omap3gta04.c whenever I touch the screen I get a stream of

Mmh, you may have used an older revision than the current HEAD (I
removed that particular printk, renamed ts_get_pendown_state and
cleaned-up the tsc2007 platform code on the board file, in a desperate
attempt to fix that issue). I have tried locally reverting these last
few commits, it still doesn't work any better.

I didn't make it report the return value of the
tsc2007_get_pendown_state, though the function isn't even called
(because the IRQ isn't triggered), so it actually doesn't even read the
GPIO value, nor does it report anything to userspace.

Android has a getevent utility that can be used to dump the events from
the inputs: when the IRQ isn't triggered (but I am touching the screen
after a pause), it doesn't report anything.

Sometimes, it looks like it works correctly for like 20 seconds or so,
and after cycles of pauses/touches, it starts failing more and more

It's a bit strange that the issue doesn't seem to occur for you while
it's very obvious here.

> This is consistent, where I touch lots of times  in succession, or leave it
> for a minute before touching again.
> Could you try the same experiments and report the results?

Paul Kocialkowski, Replicant developer

Replicant is a fully free Android distribution

Website:        http://www.replicant.us
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