linux-kernel - Re: [PATCH v2] iio: ti_am335x_adc: Take touchscreen steps into account for conversion timeout

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Date:	Sat, 21 Sep 2013 13:25:42 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Matthias Kaehlcke <matthias.list@...hlcke.net>,
	Jonathan Cameron <jic23@....ac.uk>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Felipe Balbi <balbi@...com>,
	Pantelis Antoniou <panto@...oniou-consulting.com>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: ti_am335x_adc: Take touchscreen steps into account
 for conversion timeout

On 09/16/13 22:17, Matthias Kaehlcke wrote:
> The calculation of the old conversion timeout value was based on the number of
> steps used by this driver. This doesn't take into account that other steps
> can be used by the touchscreen driver. Select the timeout value based on the
> steps used by both drivers
> 
> Signed-off-by: Matthias Kaehlcke <matthias@...hlcke.net>
Looks fine to me but I'd like an Ack from someone more familiar with the device
if possible.

Also, I'm assuming this is a fix we want to push out asap but that isn't
clear in your patch title.  Perhaps something like:

iio: ti_am335x_adc: Fix conversion timeout to allow for touch screen steps.
?

> ---
>  drivers/iio/adc/ti_am335x_adc.c      | 4 ++--
>  drivers/mfd/ti_am335x_tscadc.c       | 1 +
>  include/linux/mfd/ti_am335x_tscadc.h | 1 +
>  3 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index 3ceac3e..75be579 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -145,8 +145,8 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
>  	u32 step = UINT_MAX;
>  	bool found = false;
>  	u32 step_en;
> -	unsigned long timeout = jiffies + usecs_to_jiffies
> -				(IDLE_TIMEOUT * adc_dev->channels);
> +	unsigned long timeout = jiffies + usecs_to_jiffies(IDLE_TIMEOUT *
> +		(adc_dev->channels + adc_dev->mfd_tscadc->tsc_steps));
>  	step_en = get_adc_step_mask(adc_dev);
>  	am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
>  
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index b003a16..b2e1a1c 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -228,6 +228,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
>  	/* TSC Cell */
>  	if (tsc_wires > 0) {
>  		tscadc->tsc_cell = tscadc->used_cells;
> +		tscadc->tsc_steps = readouts * 2 + 2;
>  		cell = &tscadc->cells[tscadc->used_cells++];
>  		cell->name = "TI-am335x-tsc";
>  		cell->of_compatible = "ti,am3359-tsc";
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index db1791b..7e8d702 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -147,6 +147,7 @@ struct ti_tscadc_dev {
>  	struct mfd_cell cells[TSCADC_CELLS];
>  	u32 reg_se_cache;
>  	spinlock_t reg_lock;
> +	int tsc_steps;
>  
>  	/* tsc device */
>  	struct titsc *tsc;
> 
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