[PATCH v4 2/6] input: touchscreen: ti_am335x_tsc: Remove udelay in interrupt handler

Richard Cochran richardcochran at gmail.com
Sat Nov 15 11:27:39 PST 2014

On Fri, Nov 14, 2014 at 10:37:27AM +0530, Vignesh R wrote:
> From: Brad Griffis <bgriffis at ti.com>
> TSC interrupt handler had udelay to avoid reporting of false pen-up
> interrupt to user space. This patch implements workaround suggesting in
> Advisory 1.0.31 of silicon errata for am335x, thus eliminating udelay
> and touchscreen lag. This also improves performance of touchscreen and
> eliminates sudden jump of cursor at touch release.

I back ported this series onto v3.15.1 in order to try this out on a
custom, beaglebone-like board. With this series, the touch is really
broken. (I had fixed the pen up problem in a totally different way for
a customer, and so I wanted to try out your solution.)

I will try to port the board code to a more recent kernel to try your
series again. With which kernel version did you test your patches?

And which board?


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