Hi Sebastian,

On Monday 24 November 2014 05:21 PM, Sebastian Andrzej Siewior wrote:

* Vignesh R | 2014-11-14 10:37:25 [+0530]:

quoted

This series of patches fix TSC defects related to lag in touchscreen
performance and cursor jump at touch release. The lag was result of
udelay in TSC interrupt handler. Cursor jump due to false pen-up event.
The patches implement Advisory 1.0.31 in silicon errata of am335x-evm

am335x not -evm. The am335x-evm is a board (with its own advisory
document) built around the SoC.

Just testing the v4. I can use now IIO and touchscren at the same time.
back at v1 I reported that it does not work, this has been fixed now.
I had it running for a few minutes, now I see one of WARN_ON() beeing
triggered (I've cut a few numbers so don't wonder about PID 2 and so on):

I fixed the issue that was triggering the WARN_ON(). I think it would be
better if you tested these patches, before I posted them on the
mainline. I don't want to clutter the list with too main versions. Here
is the link to the tree with latest changes:

git clone -b tsc-devel git://git.ti.com/kernel/tsc-adc.git
(tsc-devel branch)

Please test the above tree and let me know the results.
I will post new version(v5) if there are no issues wrt IIO and TSC
working at the same time.

The cursor jump at touch release has been fixed. But I do see random
cursor movement when dragging on the screen. This is not due to false
pen-up events. My patches do not aim at fixing them. (the aim is to
remove udelay in irq handler and fix false pen-ups).
With these changes, false pen-ups have been eliminated and there is a
significant improvement in the performance of TSC. I feel these patches
can go in, if there are no other serious issues.

I will work on random cursor jump in a separate patch series.

Regards
Vignesh