staging:iio:adc:MXS:LRADC: fix touchscreen statemachine

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@pengutronix.de>
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 7fc66a6a6e36c19077144c702b32e91bb1767792..514844efac75833252f25891d591dad1d844092c 100644 (file)
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -757,6 +757,7 @@ static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
        }
 
        /* 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);
 }