This is a note to let you know that I've just added the patch titled
staging:iio:adc:MXS:LRADC: fix touchscreen statemachine
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-iio-adc-mxs-lradc-fix-touchscreen-statemachine.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 760dbe1dcb6d3dd3ead73dc69b23f206b52273bb Mon Sep 17 00:00:00 2001
From: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
Date: Mon, 24 Feb 2014 14:39:00 +0000
Subject: staging:iio:adc:MXS:LRADC: fix touchscreen statemachine
From: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
commit 760dbe1dcb6d3dd3ead73dc69b23f206b52273bb upstream.
Releasing the touchscreen lets the internal statemachine left in a wrong state.
Due to this the release coordinate will be reported again by accident when the next
touchscreen event happens. This change sets up the correct state when waiting
for the next touchscreen event.
This has led to reported issues with calibrating the touchscreen.
Bug was introduced somewhere in the series that began with
18da755de59b406ce2371a55fb15ed676eb08ed2
Staging/iio/adc/touchscreen/MXS: add proper clock handling
in which the way this driver worked was substantially changed
to be interrupt driven rather than relying on a busy loop.
This was a regression in the 3.13 kernel.
Signed-off-by: Juergen Beisert <jbe@xxxxxxxxxxxxxx>
Tested-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/iio/adc/mxs-lradc.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -698,6 +698,7 @@ static void mxs_lradc_finish_touch_event
}
/* if it is released, wait for the next touch via IRQ */
+ lradc->cur_plate = LRADC_TOUCH;
mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ, LRADC_CTRL1);
mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
}
Patches currently in stable-queue which might be from jbe@xxxxxxxxxxxxxx are
queue-3.13/staging-iio-adc-mxs-lradc-fix-touchscreen-statemachine.patch
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