mfd: ti_am335x_tscadc: Fix TSC resume

commit 6a71f38dd87f255a0586104ce2a14d5a3ddf3401 upstream.

In the resume path, the ADC invokes am335x_tsc_se_set_cache() with 0 as
the steps argument if continous mode is not in use. This in turn disables
all steps and so the TSC is not working until one ADC sampling is
performed.

This patch fixes it by writing the current cached mask instead of the
passed steps.

Fixes: 7ca6740cd1cd ("mfd: input: iio: ti_amm335x: Rework TSC/ADCA
synchronization")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e3076afe6b3ca1bafc3ef0082d165e98024eaeb3..e87a2485468f27813ba82da1bde89cb810a243c3 100644 (file)
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -58,7 +58,7 @@ void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val)
        if (tsadc->adc_waiting)
                wake_up(&tsadc->reg_se_wait);
        else if (!tsadc->adc_in_use)
-               tscadc_writel(tsadc, REG_SE, val);
+               tscadc_writel(tsadc, REG_SE, tsadc->reg_se_cache);
 
        spin_unlock_irqrestore(&tsadc->reg_lock, flags);
 }