* Zubair Lutfullah | 2013-08-13 17:48:16 [+0100]:
>diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
>index e1c5300..e165fcb 100644
>--- a/drivers/input/touchscreen/ti_am335x_tsc.c
>+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
>@@ -52,6 +52,7 @@ struct titsc {
> u32 config_inp[4];
> u32 bit_xp, bit_xn, bit_yp, bit_yn;
> u32 inp_xp, inp_xn, inp_yp, inp_yn;
>+ u32 step_mask;
> };
>
> static unsigned int titsc_readl(struct titsc *ts, unsigned int reg)
>@@ -196,7 +197,8 @@ static void titsc_step_config(struct titsc *ts_dev)
>
> /* The steps1 … end and bit 0 for TS_Charge */
> stepenable = (1 << (end_step + 2)) - 1;
>- am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable);
>+ ts_dev->step_mask = stepenable;
>+ am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask);
> }
>
> static void titsc_read_coordinates(struct titsc *ts_dev,
>@@ -316,7 +318,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
>
> if (irqclr) {
> titsc_writel(ts_dev, REG_IRQSTATUS, irqclr);
>- am335x_tsc_se_update(ts_dev->mfd_tscadc);
>+ am335x_tsc_se_set(ts_dev->mfd_tscadc, ts_dev->step_mask);
> return IRQ_HANDLED;
> }
> return IRQ_NONE;
titsc_step_config() computes the mask once since it does not change. It
is then assigned via am335x_tsc_se_set() to ->reg_se_cache() and later
always udpated via am335x_tsc_se_update(). This should ensure that ADC's
and TSC's bits are in sync and clear each other out.
Now you call am335x_tsc_se_set() in every irq which adds the TSC's mask
to ->reg_se_cache but why? It was never removed.
Sebastian
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