From: Vignesh R <vigneshr@ti.com>
Date: Mon, 1 Sep 2014 06:31:06 +0000 (+0530)
Subject: mfd: ti_am335x_tscadc: Fix TSC operation after ADC continouous mode
X-Git-Tag: fixes-against-v3.18-rc2~69^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ac734d2242949f41eb1346ca0fd4ed010c937aa;p=pandora-kernel.git

mfd: ti_am335x_tscadc: Fix TSC operation after ADC continouous mode

After enabling and disabling ADC continuous mode via sysfs, ts_print_raw
fails to return any data. This is because when ADC is configured for
continuous mode, it disables touch screen steps.These steps are not
re-enabled when ADC continuous mode is disabled. Therefore existing values
of REG_SE needs to be cached before enabling continuous mode and
disabling touch screen steps and enabling ADC steps. The cached value
are to be restored to REG_SE once ADC is disabled.

Fixes: 7ca6740cd1cd ("mfd: input: iio: ti_amm335x: Rework TSC/ADC synchronization")

Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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