[PATCHv6] staging/iio/adc: change the MXS touchscreen driver implementation

[Alexandre Belloni]

Hi Juergen,

On 24/02/2014 at 14:16:24 +0100, Juergen Beisert wrote :
> Hi Alexandre,
> 
> > While I don't have much experience with the TS part of the code but I
> > can investigate if you don't have any idea.
> 
> can you please test the following patch?
> After releasing the touchscreen the internal state machine was left in a
> wrong state.
> 

This seems to solve the issue. You can send the patch with my Tested-by.

It is probably worth trying to get it in 3.14.

Thanks !

> diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
> index e2dd783..558a76c 100644
> --- 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(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);
>  }
> 
> Regards,
> Juergen
> 
> -- 
> Pengutronix e.K.                              | Juergen Beisert             |
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-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com