[PATCH 1/2] improve-s3c2410_ts-debug-messages.patch

Matt Reimer mattjreimer at gmail.com
Wed Nov 19 21:43:03 CET 2008

On Tue, Nov 18, 2008 at 11:27 PM, Nelson Castillo <nelsoneci at gmail.com> wrote:
> On Wed, Nov 19, 2008 at 2:22 AM, Nelson Castillo <nelsoneci at gmail.com> wrote:
>> * Print debugging information when you need to send a missing touch event.
>> * Remove a few warnings in printk (%ld used when %d is enough).
>> With this patch we can see more information about the touchscreen misbehavior
>> and a pattern can be spotted: the data that comes right after the missing
>> touch event that is being sent is always wrong.
>> Also notice that sometimes the messages labeled "First" are also broken.
>> All other readings seem to be OK (confirmed with longer tests).
>> In this example all points pressed were near (X:142, Y:876).
> I am trying to understand the issue.
> Here is a longer test (points near (X:128, Y:872)).
> I wonder if it says something.

FWIW, on another s3c2440 device I noticed a significant difference in
noise when the LCD was powered. I think I tried sampling during VBL
but I don't recall if that helped.


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